Service TrainingSelf-study Programme 379The Eos 2006 Electrical systemDesign and functionThe Volkswagen Eos takes a pioneering approach to convertible roof technology. Besides the actual convertible roof control system, this also affects some of the vehicle's other electronic systems, such as e.g. the window convenience control system, the interior monitoring system or the parking aid function.As a supplement to self-study programme 335 "The Eos 2006", we would like to focus on the function of the convertible roof control system and the electrical system in the Eos in this issue.Please also note self-study programme SSP355 "The Eos 2006" under all circumstances. Only by reading both programmes will you be able to obtain an overview of the complex roof structure and its function.S379_132NEWImportant NoteThe self-study programme shows the design and function of new developments. The contents will not be updated.For current testing, adjustment and repair instructions, refer to the relevant service literature.2ContentsIntroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4The vehicle electrical system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 The structure of the vehicle electrical system . . . . . . . . . . . . . . . . . . . . . . . . . 6 Voltage supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Data bus networking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 The vehicle electrical system in the CAN data bus . . . . . . . . . . . . . . . . . . . 10Convenience electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrohydraulic convertible roof actuation . . . . . . . . . . . . . . . . . . . . . . . . . Electric easy entry seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interior monitoring system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 12 58 59Radio and navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 The aerial concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Emergency operation strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64Test yourself . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 653IntroductionModern motor vehicles are characterised by a multitude of electrical and electronic systems, which regulate the vehicle's operation, increase vehicle safety and driving comfort and support the driver in driving the vehicle. Interaction between these systems can only function if they respond to each other. For example, the ABS and ESP control unit must be able to instruct the engine control unit to reduce the engine's output if this is made necessary by a corresponding driving situation. Today, this information is extensively exchanged in digital form via fast data bus systems. As a result of this high technical standard, it is becoming increasingly important to update the vehicle systems' software via on-line workshop links and to ensure that this is kept up-to-date. In view of this, the Eos, the most recent development in the convertible range, also reveals a multitude of vehicle systems which exchange information, as part of controlling the convertible roof, to ensure safe and flawless convertible roof operation. In the Eos, the new immobilizer IV is one of those systems which requires an on-line workshop link to download data to adapt the system.S379_0284In terms of its electrical system, the Eos offers the following special features, some of which originate from the vehicle's conception as a coupé convertible:●●●Convertible roof control system This contains the hydraulic and electric drive, the convertible roof sensor system and communication with other vehicle systems via CAN data bus. Interior monitoring system Modern microwave technology guarantees protection against theft even when the convertible roof is open. Immobilizer The Eos is equipped with the immobilizer IV with download function. An on-line link is the prerequisite for adapting this. In contrast to the Passat 2006, in which the system was fitted for the first time, the immobilizer IV is not equipped with an electric steering column lock.●●●●Climate control system This gives consideration to the influence of ambient conditions when the convertible roof is open. The aerial concept Thanks to a new installation concept in the rear lid, exterior and window aerials are no longer necessary. Rear lid assist An extended Park Distance Control function ensures that the space required behind the vehicle for the convertible roof's action is available. Electric easy entry function Comfortable entry and exiting to and from the rear seats thanks to an electric seat adjustment system.S379_0395The vehicle electrical systemThe structure of the vehicle electrical systemInstallation locations of the electrical components To implement the electrical functions, it was necessary to completely redesign certain control units and to accordingly adapt other control units originating from the Golf platform. The vehicle electrical system's central component is the vehicle electrical system control unit. In the Eos, this is located beneath the dash panel on the driver's side. The electronics box in the engine compartment contains the main fuse holder and a relay carrier. Further relays are located on the vehicle electrical system control unit and the relay carrier on the vehicle electrical system control unit bracket. The thermo-fuse for the externally guided sliding roof is also located there. A further fuse holder is located at the left-hand side of the dash panel. The convertible roof actuation system fuses are located together on the main fuse holder in the electronics box. Due to the vehicle-specific spatial conditions, the Eos is equipped with two 6V batteries instead of one 12V battery if the 6-cylinder engine is installed.Driver side easy entry control unit (easy entry function)Electronics box with relay carrier and fuse holder6Parking aid control unitConvertible roof actuation control unitInterior monitor send and receive module 2Driver door control unit Fuse holder in the dash panel S379_1537The vehicle electrical systemVoltage supplyDue to reasons of space depending on which engine is fitted, the Eos is equipped with two 6V absorbent mat batteries instead of the conventional 12V battery in the engine compartment. These are installed behind the rear seat backrest on the left and right-hand sides of the vehicle and wired in series via a connecting cable with degassing pipe. This battery concept is used if engines requiring large amounts of space, e.g. the V6 engine, are fitted in the Eos.The following points must be observed under all circumstances in the event of repair and servicing:- When charging, checking or renewing, both 6V batteries must be treated as one 12V unit. - Only charge the modules to a maximum of 14.4V with voltage limitation. - Never charge or renew a 6V module individually. - 6V modules must always be evenly loaded. Never connect a consumer to just one module.- On disconnection, always loosen the body-side negative terminal first, as there is otherwise a risk of one 6V module's short-circuiting due to ground contact.Vehicle electrical system positive connection Battery module 1 Cable for wiring the two battery modules in series Battery module 2S379_077 Pyrotechnical battery isolation system Battery positive connection/ battery isolation system Vehicle ground connection8Positive Battery moduleGroundLead cell element connecting plateCylindrical cell elementPlastic housingAbsorbent glass mat separatorHigh-purity Lead grid plates S379_083Absorbent mat batteries The structure of absorbent mat batteries differs significantly from that of conventional vehicle batteries. Significant features of absorbent mat batteries include: - The rolled, cylindrical structure of the positive and negative lead grid plates together with an absorbent glass mat separator to form a cell element results in a very compact battery module design with a simultaneous increase in output. - The compact, pressed cell connection results in increased vibration resistance and therefore a longer service life. - The battery acid is bound in the absorbent glass mat separator. The battery is therefore leak-proof. - The absorbent mat battery has a higher cold-starting output than conventional vehicle batteries. - The battery modules are maintenance-free.When handling the 6V absorbent mat batteries in the Eos, note the information in the corresponding workshop manuals under all circumstances.9Data bus networkingThe vehicle electrical system in the CAN data busThe block diagram shows you which control units in the vehicle electrical system communicate with each other via the CAN or LIN data bus, in order to implement the different vehicle systems. The schematic which is shown is merely an example, as the precise number of control units in the CAN data bus systems is dependent on the vehicle's equipment. An example of this is the different sound packages or the vehicle's being equipped with a direct shift gearbox or a manual gearbox.J604 R J285 J334***J533J364J255As will be described in detail at a later point, communication via the CAN data bus is also vital to actuation of the convertible roof. To obtain approval to open and close the roof, diverse pieces of information have to be exchanged between different vehicle systems, in order to guarantee maximum possible safety and functionality.J412J503J345J519J525J446J393R78J527SDARS**J386G197**J388J256J387J389J572J57310J623J743* J400 G397G303H8G384 G85 J104E221 J234 J500J745Legend E221 Operating unit in steering wheel G85 Steering angle sender G197 Magnetic field sender for compass ** G303 Interior monitor send and receive module 1 G384 Vehicle inclination sender G397 Rain and light sensor H8 Anti-theft alarm system horn J104 ABS control unit J234 Airbag control unit J255 Climatronic control unit J256 Convertible roof actuation control unit J285 Control unit with display in dash panel insert J334 Immobilizer control unit *** J345 Trailer detector control unit J364 Auxiliary heater control unit J386 Driver door control unit J387 Front passenger door control unit J388 Rear left door control unit J389 Rear right door control unit J393 Convenience system central control unit J400 Wiper motor control unit J412 Mobile telephone operating electronics control unit J446 Parking aid control unit J500 Power steering control unit J503 Control unit with display for radio and navigation J519 Onboard supply control unit J533 Data bus diagnostic interface J525 Digital sound package control unit J527 Steering column electronics control unit J572 Driver side easy entry control unit J573 Front passenger side easy entry control unit J604 Auxiliary air heater control unit J623 Engine control unit J667 Power output module for left headlight J668 Power output module for right headlight J743 Mechatronic unit for direct shift gearbox * J745 Cornering light and headlight range control unit R Radio R78 TV tuner SDARS = Satelite Digital Audio Radio Services** (digital audio satellite reception system)J667J668S379_027 * ** *** With direct shift gearbox only North America only Immobilizer IV with download (without electric steering column lock in the Eos)11Convenience electronicsElectrohydraulic convertible roof actuationCSC convertible roof structure CSC convertible roof means Coupé Sliding and Convertible roof. It is divided into five assemblies, which are moved independently of each other during convertible roof actuation:● ●Apart from the sliding roof module, all of the assemblies are moved with the aid of hydraulic cylinders. The operating pressure required for this is supplied by an electric hydraulic pump. The sliding roof module is driven by an electric motor, which is installed in the middle segment.● ●The sliding roof module The middle segment (M segment) with the sliding roof module's electric drive The C segment with the rear window The roof side members with the main drive. On each side of the vehicle, these are comprised of the main hinge, two hydraulic cylinders, the roof side member including its trim panels and the necessary mechanical actuations and locks.Sliding roof module M segment C segment Roof side members with main driveRoof frame assembly S379_04912Rear lid structure The rear lid is comprised of the two securing frames, the rear lid hinges, the rear shelf with cover flaps, the rear lid lock and the rear lid. To open the luggage compartment to accommodate the roof package, the rear lid's movement is linked closely to the roof segments' movement sequence. Two hydraulic cylinders on each side of the vehicle also undertake the necessary functions on actuation of the rear lid. A pair of cylinders in the rear lid securing frames releases the rear lid from the body and the C segment and locks the securing frames to the rear lid, so that the rear lid can pivot backwards, before the roof package is placed into the luggage compartment. This pair of cylinders also ensures that the cover flaps on the rear shelf are closed. The second pair of cylinders is installed in each rear lid hinge. This carries out the rear lid and roof side member flap opening and closing movement.Rear lid in luggage compartment functionCover flap Rear shelfSecuring frame Rear lid in convertible functionRear lid hinge Hydraulic cylinder in the rear lid hinge Rear lid lock S379_07813Convenience electronicsConvertible roof control systemThe involved electrical componentsTo guarantee flawless roof operation, not only do the CSC convertible roof's electronic components have to communicate with and react to each other, but extensive information also has to be exchanged with other control units and electronic components. For example, the convertible roof control unit has to transmit the command "Lower windows" or "Raise windows" to the door control units. In turn, the door control units inform the convertible roof control unit of the position of the side windows. This is necessary, because the side windows have to be lowered before the roof begins to move so that they do not collide with the moving parts of the convertible roof. The adjacent schematic shows all of the electronic components and control units which communicate with each other as part of the convertible roof control system.Legend E40 Front left window regulator switch E53 Rear left window regulator switch, in driver door E55 Rear right window regulator switch, in driver door E81 Front right window regulator switch, in driver door E107 Window regulator switch in front passenger door E137 Convertible roof actuation button E189 Central switch for window regulators in driver door E233 Rear lid remote release button E319 Fuel tank flap release button E325 Sunroof button F364 Luggage cover contact switch G555 Hydraulic pump temperature sender G556 Front sender for position of left roof member G557 Front sender for position of right roof member G558 Sender for left roof member locked G559 Sender for right roof member locked G560 Left sender for rear window frame locked G561 Right sender for rear window frame locked G562 Sender for rear window frame open G563 Left sender for rear shelf locked G564 Right sender for rear shelf locked G565 Sender for roof stowed G566 Sender for left roof member flap open G567 Sender for right roof member flap open J104 ABS control unit J245 Sliding sunroof adjustment control unit J255 Climatronic control unit J256 Convertible roof actuation control unit J285 Control unit with display in dash panel insert J345 Trailer detector control unit J386 Driver door control unit J387 Front passenger door control unit J388 Rear left door control unit J389 Rear right door control unit J393 Convenience system central control unit J446 Parking aid control unit J519 Onboard supply control unit J533 Data bus diagnostic interface J657 Power latching control unit N272 Power operated convertible roof valve 1 N341 Power operated convertible roof valve 2 N342 Power operated convertible roof valve 3 V1 Sliding sunroof motor V26 Rear left window regulator motor V27 Rear right window regulator motor V118 Convertible roof actuation hydraulic pump V147 Driver side window regulator motor V148 Front passenger side window regulator motor V329 Power latching motor a Hydraulic unit b+c Driver door control panelsMore detailed information on the operating conditions for roof movement can be found in this issue as of page 38.14E107 V148 V27J104 J285 J533J387J389J345J255J393J386J388J446J256 aJ519V147V26 bG555 N272 E137 E325 J245 G556 J657 G558 G560 G563 G566 G562 G565 G559 G561 G564 G567 F364 N341 N342 V118E40 E81 E53 E55E189V1c E233 E319V329G557S379_02915Convenience electronicsControls and displaysThe sliding roof module button This is integrated into the convertible roof actuation button. Pressing opens the sliding roof. Pulling closes the sliding roof. Depending on the length of time for which the button is pressed or pulled, movement is carried out either automatically or manually. If, on opening, the button is held down for less than 0.5 seconds, automatic movement which brings the sliding roof to the ventilation position and ends there is started. Further actuation of the button for less than 0.5 seconds starts a second automatic movement, which opend the sliding roof fully. If, when the sliding roof is closed, the button is actuated for longer than 0.5 seconds, manual movement is started. Manual movement continues as long as the button is actuated. After passing the ventilation position, a switch can be made from manual to automatic mode by actuating the button again for less than 0.5 seconds. The sliding roof opens completely. When closing the roof, automatic or manual movement is also possible. In this case, the sliding roof always stops at the ventilation position. Closing it completely is only possible in manual mode.S379_040 Open sliding roof Ventilation position.Automatic movement 1x ☞0.5 seconds S379_112Automatic movement +1x ☞0.5 seconds S379_113Man. movement☞0.5 secondsClose sliding roofS379_114Automatic movement 1x ☞0.5 seconds S379_1151x ☞0.5 secondsS379_11716Convertible roof actuation button The convertible roof actuation button can also be actuated in two directions. Pressing and holding opens the convertible roof if the conditions for movement are met. Pulling and holding closes the convertible roof. If the button is released during roof movement, the movement stops. If the button is not actuated again within max. 8 minutes, only closing is then possible. After max. 9.5 minutes, the convertible roof is lowered automatically in clocked stages, accompanied by a continuous gong, in the direction of the nearest centre of gravity position. This means that, depending on the position which the roof has reached, lowering is carried out in the "opening" or "closing" direction, in accordance with gravity.S379_038Window regulator actuation In convertible operation, it will often be the case that all window regulators have to be actuated simultaneously. A central switch for window actuation is therefore necessary. This central switch for window regulators in the driver door E189 is integrated into the window actuation button panel on the driver's side. Its signal runs directly to the convertible roof actuation control unit, and from there to the individual door control units. The side windows must be completely lowered so as not to impede or damage the convertible roof modules during their movement sequence.S379_04117Convenience electronicsRoof status indicator, low-line versionS379_042 S379_155 GongIn this variant , communication between the convertible top control system and the driver takes place via an indicator symbol in the dash panel insert and an acoustic signal sender. The symbol lights up during roof movement. The driver is informed that the end position has been reached via a gong and extinguishment of the indicator symbol. A flashing indicator symbol indicates a system fault in the convertible roof control system, e.g. an incorrectly inserted luggage cover. During vehicle operation, a flashing symbol with repeated gong indicates that the convertible roof is not fully closed or stowed.Convertible roof actuation control unit fault messages are only shown on the display when the convertible roof is actuated. The exception to this is a fault in the roof member locked senders. Failure of these is immediately displayed by setting the indicator symbol and with the "System fault – close convertible roof" message, to encourage the driver to check the situation.18Roof status indicator, mid-line and high-line versionConvertible roof operationS379_043 S379_155 GongBesides the indicator symbol and the acoustic signal sender, these two equipment variants contain a text field in the dash panel insert, in which the driver is shown information on convertible roof operation. In addition to the illuminated symbol, the message "convertible roof operation" is also shown in the dash panel insert during roof movement. After reaching an end position, the gong is also sounded and the indicator symbol extinguished in this case. Depending on the status of the convertible roof, "convertible roof opened" or "convertible roof closed" is displayed in the text field. During vehicle operation, a flashing symbol with repeated gong indicates that the convertible roof is not fully closed or stowed.The following information is shown as notes or fault messages in the display: Notes - Close luggage cover - Close rear lid - Obstacle in rear area - Convertible roof overheating - Speed too high - Sliding roof overheating - Convertible roof open - Convertible roof closed - Convertible roof operation - Continue convertible roof operation Fault messages - Close side windows - Close sliding roof - Trailer – no convertible roof operation - Open rear lock - System fault – close convertible roof - System fault – open convertible roof - System fault - no convertible roof operation - Convertible roof defective! Operating instructions.19Convenience electronicsDisplays on "opening" the roofTo guarantee a high level of safety, roof movement is accompanied, depending on the equipment variant, by optical, acoustic and/or text displays/indications. The acoustic indication is a gong, which is sounded once.Low-lineSituation Indication (Optical/ acoustic)Mid-lineIndication (Optical/acoustic/text) Convertible roof operationHigh-lineIndication (Optical/acoustic/text) Convertible roof operationOpen sliding roof and side windowsOpen C segmentConvertible roof operationConvertible roof operationOpen rear lidRear lid pivots out!Rear lid pivots out!Stow roof packageConvertible roof operationConvertible roof operationClose rear lidConvertible roof operationConvertible roof operationEnd "opening" processConvertible roof openConvertible roof openOn interruption of convertible roof movementContinue convertible roof operationContinue convertible roof operation20Displays on "closing" the roofNote for vehicles in North America. During convertible roof movement, a gong is sounded several times here. Reaching the relevant end position is indicated via the single gong, as in the other countries.Low-lineSituation Indication (Optical/ acoustic)Mid-lineIndication (Optical/acoustic/text) Convertible roof operationHigh-lineIndication (Optical/acoustic/text) Convertible roof operationOpen side windowsOpen rear lidRear lid pivots out!Rear lid pivots out!Stow roof packageConvertible roof operationConvertible roof operationClose rear lidConvertible roof operationConvertible roof operationOpen C segmentConvertible roof operationConvertible roof operationClose sliding roofConvertible roof operationConvertible roof operationEnd "closing" processConvertible roof closedConvertible roof closedOn interruption of convertible roof movementContinue convertible roof operationContinue convertible roof operation21Convenience electronicsSensors and hydraulic systemThe function of the CSC roof involves complex interaction between the roof hydraulics and roof sensors. As described above, the entire roof movement sequence, with the exception of the sliding roof module, is carried out via 8 hydraulic cylinders, which are actuated in pairs by a hydraulic unit. This actuation is carried out via three solenoid valves in the hydraulic unit's valve block. So that the roof control system can monitor the current positions of all moving assemblies, the roof system is equipped with 12 Hall senders. A microswitch in the luggage compartment registers the correct position of the luggage cover. A temperature sensor on the hydraulic pump monitors the temperature of the pump drive. Timeouts, which indicate failure of the roof function due to a leak in the hydraulic system, mechanical damage, blocked movements, implausible convertible roof position messages or communication faults between the linked control units are additionally integrated into the roof control electronics. These timeouts also serve to protect the system, etc., by limiting convertible roof operation following continuous operation or stoppage in an intermediate position for 8 minutes.Legend Hydraulic cylinders: 1 In the left main hinge 2 In the left roof side member (C-pillar) 3 In the left rear lid hinge 4 In the left rear lid securing frame 5 In the right main hinge 6 In the right roof side member (C-pillar) 7 In the right rear lid hinge 8 In the right rear lid securing frame a Sliding roof module b M segment c C segment d Roof side member e Rear lid f Side flap J256 Convertible roof actuation control unit Hydraulic unit G555 Hydraulic pump temperature sender N272 Power operated convertible roof valve 1 N341 Power operated convertible roof valve 2 N342 Power operated convertible roof valve 3 V118 Convertible roof actuation hydraulic pump Sensors F364 Luggage cover contact switch G556 Front sender for position of left roof member G557 Front sender for position of right roof member G558 Sender for left roof member locked G559 Sender for right roof member locked G560 Left sender for rear window frame locked G561 Right sender for rear window frame locked G562 Sender for rear window frame open G563 Left sender for rear shelf locked G564 Right sender for rear shelf locked G565 Sender for roof stowed G566 Sender for left roof member flap open G567 Sender for right roof member flap openSliding roof module V1 Sliding sunroof motor22Left side of vehicle G556 a d G558 V1 d G565 2 bG560 c 4G562 G563 3 1efG566G555 N272 N341 N342F364V118 J256Right side of vehicle G561G557 8 6 G559G564 G567 7 5S379_01823Convenience electronicsConvertible roof sensorsThe Eos is equipped with an extensive roof sensor system. The illustration shows the approximate positions of the individual sensors within the overall convertible roof. An initial breakdown of the tasks and installation locations of the sensors is available in the form of an overview in the following tables. More detailed information can be found in the chapter entitled "Electrical components". With one exception, the sensors are all Hall senders. Only the sensor which determines whether the luggage cover is in position is a microswitch. This is the luggage cover contact switch F364, located on the left-hand luggage cover mounting. Three types of Hall sender are fitted: - Hall elements with integrated reference magnet, - Hall elements with an external reference magnet and - Hall elements with two external reference magnets. These do not register the entire course of a movement, but only one or more end points of the movements of individual components and locks. The convertible roof actuation control unit cannot therefore determine the intermediate position in which a roof segment is located at an arbitrary point in time, only whether it is located in one of the end positions. To guarantee maximum possible operating safety, the majority of sensors are fitted twice (1 sensor per side of the vehicle). These are also referred to as redundant sensors.S379_05624No.Short designation G556NameTask1Front sender for position of left roof memberThis indicates that the convertible roof has docked onto the cowl panel on the left-hand side of the vehicle.2G557Front sender for position of right roof memberThis indicates that the convertible roof has docked onto the cowl panel on the right-hand side of the vehicle.3G560Left sender for rear window frame locked Right sender for rear window frame locked Sender for rear window frame openThis indicates that the C segment is closed on the driver's side and is locked to the M segment.4G561This indicates that the C segment is closed on the front passenger's side and is locked to the M segment.5G562This indicates that the C segment is open.6G563Left sender for rear shelf locked Right sender for rear shelf locked Sender for roof stowedThis indicates that the left-hand rear lid has been released and is locked for the "luggage compartment" function.7G564This indicates that the right-hand rear lid has been released and is locked for the "luggage compartment" function.8G565This indicates that the roof package is stowed in its end position in the luggage compartment.9G566Sender for left roof member flap openThis indicates that the roof side member flap on the driver's side is open.10G558Sender for left roof member lockedThis indicates that the roof side member on the driver's side is locked to the A-pillar.11G559Sender for right roof member lockedThis indicates that the roof side member on the front passenger's side is locked to the A-pillar.12G567Sender for right roof member flap openThis indicates that the roof side member flap on the front passenger's side is open.25Convenience electronicsHall senders in the roof sensor system As in the case of other vehicle systems, Hall senders are also suitable for position detection. The roof sensor system in the Eos is equipped with three different types of Hall sender: - Hall senders with integrated magnet - Hall senders with an external magnet - Hall senders with two external magnets.●Example: Sender with integrated reference magnetHall sender with integrated magnetIn this design, as e.g. in the case of the senders for opening the roof side member flaps, the sender's signal voltage changes when the roof side member's carrier moves into the integrated magnet's field. By positioning the sender accordingly, the monitored component's reaching a defined end position can be determined. Due to this structure, however, the sensor electronics are unable to distinguish between whether the monitored component is located in the other end position or between the two end positions. The disadvantage of this design is that the sender and the sensed component have to be positioned very precisely in relation to each other, so that the sensed component is able to adequately influence the signal voltage when it moves through the integrated magnet's magnetic field. This means that precise adherence to these distances has to be ensured during repair work.S379_075Roof side member flap carrierFlap not openFlap open S379_07626●Example: Sender with external reference magnetExternal magnet Lock guide plateHall senderS379_074Guide plate releasedIn comparison with Hall senders with integrated magnets, Hall senders with external magnets have the advantage that they permit greater installation dimension tolerances in the spatial layout between the sender and sensed component, in order e.g. to carry out adjustments within certain limits. One example of the design with an external magnet are the senders for locking the rear window frame to the M segment. In these, the lock guide plates carry a magnet. The Hall sender is therefore able to determine the positions "guide plate locked" and "guide plate not locked".Guide plate locked S379_073●Example: Sender with two external reference magnetsGuide plate locked S379_070 Lock guide plate External magnet 1Hall sender External magnet 2 Intermediate positionS379_071To determine whether a lock, e.g. that of the rear lid, is located in one of the defined end positions or between the two, the design with two external magnets is appropriate. In this case, both magnets are mounted on the moveable lock guide plate in such a way that one of the two is located above the stationary sender when the monitored component is in one of its two end positions. This enables the convertible roof actuation control unit to distinguish between released and locked. It can additionally determine whether the sensed component is located in an intermediate position.S379_072Guide plate released27Convenience electronicsHydraulic unitThe 8 hydraulic cylinders for the convertible roof and the rear lid are supplied with hydraulic fluid by just one hydraulic unit. This is installed beneath the floor cover in the luggage compartment and is encapsulated in a foam jacket.S379_163Structure of the hydraulic unit The hydraulic unit is comprised, amongst other elements, of the reservoir, the pump drive (convertible roof actuation hydraulic pump V118) and the valve unit with three 3/2-way solenoid valves. The hydraulic pump temperature sender G555 is integrated into the pump drive, and monitors its temperature to prevent overheating. The convertible roof actuation hydraulic pump V118 is initialised to the left and right by the convertible roof actuation control unit J256. All hydraulic connections are marked with a numerical code, so that they can be easily distinguished during installation work.ReservoirEmergency cock screwValve unitPump driveS379_066 Hydraulic connections Foam encapsulation Hydraulic connections28Structure of the valve unit The valve unit is comprised of three 3/2-way solenoid valves, two mechanical shuttle valves, a number of non-return valves, a mechanical dual pressure valve and an emergency cock screw. The solenoid valves are called: Power operated convertible roof valve 1 N272, Power operated convertible roof valve 2 N341 and Power operated convertible roof valve 3 N342. An emergency cock screw * is used to open a bypass which depressurises the system. In an emergency, the convertible roof can therefore also be moved manually. If a valve is supplied with current, it allows the delivery pressure through. If it is not supplied with current, hydraulic fluid is able to flow in the opposite direction back to the pump reservoir (return flow position). Due to the special layout of the valves and integration of the pump's operating direction, the four cylinder pairs can be actuated independently of one another. In the following, the entire roof opening and closing movement will be broken down into individual stages in order to clarify the valve control system's interaction.Illustration with roof closed Hydraulic cylinder in the roof side member Hydraulic cylinder in the main hinge Hydraulic cylinder in the rear lid securing frame Hydraulic cylinder in the rear lid hinge1234a N272 N341N342ba Mechanical shuttle valve b Mechanical non-return valve c Mechanical dual-pressure valveb a V118b* The emergency cock screw is not shown in this or the following hydraulic system diagrams.J256cS379_01029Convenience electronicsOpening the convertible roof 1. The pump is initialised to the right. The hydraulic fluid passes to solenoid valves N272, N341 and N342 via the shuttle valve (a). These are supplied with current and open. Valve N342 is supplied by the second shuttle valve (b). The hydraulic cylinders in the rear lid securing frames (3) extend, because the operating pressure beneath the plungers acts on a larger plunger surface than above the plunger. Due to the hydraulic cylinders' movement, the rear lid is released from the body and the C segment. The securing frame is locked to the rear lid so that the rear lid is able to pivot out to the rear during the further process.a J256S379_0893b N272 N341N342V118S379_0442. The pump's delivery direction changes; the three valves N272, N341 and N342 continue to be supplied with current. In this position, the pump's delivery current is forced into the hydraulic cylinders in the roof side members (1), so that these are retracted. Due to this movement, the upper C segment is released and is then pivoted over the middle segment. The roof side members are additionally released from the A-pillars. The shuttle valve (a) over the hydraulic pump closes versus the return flow from the roof side members' hydraulic cylinders, with the result that the remaining cylinders are held in position.S379_0591b N272 N341N342a J256V118S379_01230S379_06043. The pump continues to deliver to the left. Valve N342 switches to the return flow position. The pump's delivery current now flows to the hydraulic cylinders in the rear lid hinges (4) and moves the plungers into the cylinders. Due to this movement, the rear lid is pivoted open to the rear, and the roof side member flaps open. The roof package can now be stowed in the luggage compartment. The hydraulic cylinders in the roof side members remain under pressure, so that they hold the C segment in position above the M segment.b N272 N341N342a J256V118S379_013S379_062 24. Now, valve N272 is also switched to the return flow position. Only valve N341 is now supplied with current, and allows the delivery current to pass. In this valve position, the hydraulic fluid from the pump compresses the two hydraulic cylinders in the main hinges (2). The roof package is stowed in the luggage compartment, whereby the roof side members are compelled to move outwards via a sliding guide rail.b N272 N341N342a J256V118S379_01531Convenience electronics5. Now, valves N341 and N342 are also supplied with current by the convertible roof actuation control unit J256. The hydraulic pump continues to deliver to the left. The two hydraulic cylinders in the rear lid hinges (4) extend again, so that the rear lid and the roof side member flaps are closed again.S379_0644b N272 N341N342a J256V118S379_0146. When the pump is operating to the left, valve N342 causes the securing frame to be locked to the body and the securing frame to be released from the rear lid by compressing the hydraulic cylinders in the rear lid securing frame (3) again. The C segment is locked in position in the luggage compartment with the aid of rubber buffers. When valve N342 is currentless and the convertible roof actuation control unit's hydraulic pump is switched off, convertible roof movement is completed. The system is once again pressureless.N272S379_0913b N341N342a J256V118S379_01932Closing the roof 1. The hydraulic pump starts up to the left and valves N341 and N342 are supplied with current. The hydraulic cylinders in the rear lid securing frames (3) extend, because the operating pressure in the chamber below the plungers acts on a greater plunger area than in the chamber above the pistons. The securing frame locks move into the position for opening the rear lid.S379_0923b N272 N341N342a J256V118S379_045S379_093 42. The pump continues running to the left and only valve N341 is supplied with current. In this manner, the delivery current passes via the second shuttle valve (b) to the hydraulic cylinders in the rear lid hinges (4). As valve N342 is located in the return flow position, the two cylinders are compressed again, so that the rear lid and the roof side member flaps open.b N272 N341N342a J256V118S379_04633Convenience electronics3. Valve N341 switches to the return flow position. Valve N272 opens and allows the delivery current to pass. As a result of this, the two hydraulic cylinders in the main hinges (2) are extended. The main drive thereby lifts the convertible roof package out of the luggage compartment. The roof side members are moved inwards again and dock onto the A-pillars.S379_0672b N272 N341N342a J256V118S379_0474. When the pump is operating to the left, all three valves open. In turn, the delivery current flows to the hydraulic cylinders in the rear lid hinges (4) and moves these apart. The rear lid and the roof side member flaps close.S379_094 4b N272 N341N342a J256V118S379_04834S379_068 15. The hydraulic pump motor's rotational direction changes. The three solenoid valves remain open. In this manner, the pump's delivery current is able to extend the hydraulic cylinders in the roof side members (1). The C segment lowers and is locked to the M segment. At the same time, the roof side members are locked to the A-pillars.b N272 N341N342a J256V118S379_050S379_095 36. When the pump is operating to the right, only valve N342 remains open. The hydraulic cylinders in the rear lid securing frames (3) are compressed. The rear lid and C segment locks close and thereby secure the roof's "closed" end position. The rear lid is released again at the same time. When the hydraulic pump is switched off and valves N272, N341 and N342 are switched to currentless, the roof movement is ended and the system is pressureless again.b N272 N341N342a J256V118S379_05135Convenience electronicsRear lid assistIf the Eos is fitted with Park Distance Control (PDC), this additionally contains the rear lid assist function. This is a convenience function and serves to avoid damage to the rear lid on movement of the convertible roof. In achieving this, the rear lid assist system makes use of the vehicle's Park Distance Control sensors, which are installed in the bumper, the convertible roof control system sensors, the convertible roof actuation button, plus the gong and the display in the dash panel insert. Rear lid assist functions independently of Park Distance Control. Park Distance Control is only active when reverse gear is engaged, whilst rear lid assist is active as soon as the convertible roof actuation button is pressed to move the convertible roof. If reverse gear is engaged at the same time, rear lid assist takes precedence over Park Distance Control.S379_165 Rear lid assistPark Distance ControlRear lid assist detection rangeWhilst Park Distance Control emits a stop warning in the form of a continuous sound if an obstacle is located approx. 30cm behind the vehicle, rear lid assist operates with an alarm distance of approx. 50cm to the rear of the vehicle. This ensures that sufficient space is available to move the rear lid horizontally (approx. 38cm).S379_166 Max. horizontal travel of the rear lid36If the convertible roof actuation button is pressed, this also simultaneously activates the rear lid assist system. If an obstacle is located within the detection range to the rear of the vehicle at this point in time, the operator is provided with a corresponding warning message via the display, and a corresponding acoustic signal is sounded via the gong. Depending on the convertible roof actuation control unit's coding, convertible roof operation is not started. By pressing the button again for a few seconds, convertible roof movement can be commenced despite the warning message.Case example: Obstacle arises after T1 Start of convertible roof movement End of convertible roof movementIf no obstacle has been detected in the rear area on requesting convertible roof movement, i.e. by pressing the convertible roof actuation button (T0), a calculated time interval starts on release of the rear lid (T1). Within this time interval, rear lid assist remains active and a warning message is issued if a new obstacle is detected. The time interval ends with the calculated point in time T2. This is the point of time as of which the rear lid moves into the rear lid assist detection range.T0T1T2 T3S379_168Case example: Obstacle arises after T2 Start of convertible roof movement End of convertible roof movementAs of point in time T2, rear lid assist is switched to passive mode, i.e. no warning message is issued, as rear lid assist is unable to distinguish between the vehicle's own rear and a new obstacle which emerges. The rear lid assist function for this convertible roof movement cycle ends with the roof side member flap senders' message that the roof side member flaps and therefore the rear lid are open (T3).T0T1 Rear lid released Rear lid openT2 T3S379_169Rear lid assist active Rear lid assist passive Warning message emerging obstacleThe operator is always responsible for convertible roof operation, as only he is able to oversee the entire converible roof movement range, including the area above the rear lid, which is not detected by the sensors.37Convenience electronicsOperating conditionsVarious conditions have to be met to enable roof movement to be carried out. This applies to opening and closing the convertible roof. One vital element of roof movement release is the detection of a plausible roof assembly position. This applies to the position of the roof assembly within its own movement sequence (e.g. identical signal from the sensor pair) and to the position of the roof assembly within the entire roof movement sequence. The release conditions also include the position of the rear lid (e.g. the C segment must not pivot down before the rear lid is closed). Accordingly, the information "C segment is locked" and "rear lid is open" would be implausible.Conditions for opening the roof1 2 3 4 5 6 7 8 Terminal 15 ignition is "on". The convertible roof position is plausible. The CAN data bus reports "communication is possible". The sliding roof reports "communication is possible". The position of the sliding roof has been recorded. Sliding roof not overheated. The microswitch detects the engaged luggage cover. The engine control unit (or ABS ECU/dash panel insert) reports "vehicle speed is less than 1 km/h". The convertible roof actuation control unit detects that roof movement has not yet been completed, i.e. the information "roof open" is not yet available. The sensors report " rear lid is closed". The convertible roof actuation switch supplies a plausible signal. The hydraulic pump temperature sender reports "temperature below 95 °C". * The hydraulic unit reports a valve operating time of less than 8 minutes. ** No trailer operation detected. The vehicle electrical system control unit reports a system voltage of over 10.8 V. The door control units report that the necessary window position has been reached.910 11 12 13 14 15 163817The power latching system reports "closed" after the convenience system control unit has output the signal "convertible roof box main catch closed". The control unit with display in dash panel insert reports "exterior temperature greater than minus 15 °C". *** The heated rear window is switched off. It is automatically deactivated on actuation of the convertible roof switch. As a parking aid function (special equipment), rear lid assist reports "no obstacle in rear area".18 19 20*If the temperature of the hydraulic fluid exceeds 95°C, only the "close convertible roof" command is possible. If the temperature of the hydraulic fluid exceeds 105°C, actuation of the convertible roof is blocked completely until the temperature falls below the threshold value again. If the hydraulic unit's valves are operated for longer than 8 minutes, e.g. due to repeated opening and closing, the convertible roof control system only permits the roof to be closed. Opening is then no longer possible. This measure also serves to prevent overheating, etc. If the temperature falls below minus 15°C, it is assumed that the viscosity of the hydraulic fluid is too high to enable roof movement.*****Conditions for closing the roof The pre-conditions are essentially identical to those of opening. Exceptions include:2 7At least one sensor must supply a plausible signal (logical 0/1) for each partial convertible roof movement. The microswitch signal that the luggage cover is in position is not vital as regards closing the roof. The convertible roof must not already be fully closed for the "close" command. A hydraulic fluid temperature of over 95 ° but below 105 °C does not influence the close command. The total actuation time of the hydraulic pump valves must be less than 9.5 minutes so that the close function is released.9 12 1339Convenience electronicsConvertible roof movement abort conditions Different conditions, which lead to the abortion of roof movement, apply to prevent damage to the roof. The convertible roof responds in different ways depending on which abort condition has occurred. These range from stopping roof movement and the options of only being able to open or close the convertible roof to clocked lowering of the roof package in the event of a timeout. One further possibility is complete failure in the event that operating voltage is absent.The following conditions lead to the abortion of convertible roof movement:1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17The vehicle electrical system voltage falls below 9.0 V. The ignition (terminal 15) is switched off. Communication via the CAN data bus is interrupted. The convertible roof actuation control unit determines that at least one hydraulic valve is defective. The convertible roof actuation control unit determines a defect in the hydraulic unit. The sensors report that the rear lid is not closed. The sensors report that the power latching system is not closed. A trailer is detected via the trailer socket. The sensors do not supply plausible signals regarding the convertible roof position. The speed is higher than 1km/h. The temperature of the hydraulic pump rises above 105°C . The terminal stage of the convertible roof actuation control unit is overheated (overheating protection). The convertible roof actuation control unit fails due to an internal fault. The door control units supply implausible signals regarding the window position or are reported as having failed. The convenience system control unit supplies implausible or no signals. The gateway supplies implausible or no signals. The gearbox control unit supplies implausible or no signals.4018 19 20 21 22 23The total hydraulic valve operating time exceeds 9.5 minutes.* The convertible roof actuation switch signal is interrupted.** The convertible roof actuation control unit generates a timeout.*** During the opening process, the luggage cover microswitch reports that the convertible roof guard is not engaged. During roof movement, the exterior temperature falls below the threshold value of minus 15 °C. The convertible roof actuation control unit determines that the temperature sender in the hydraulic unit has failed.* ** ***Convertible roof movement is interrupted if a period of 8 min is exceeded. The convertible roof actuation switch may be defective, or the operator releases the switch. Under certain circumstances, the hydraulic pump runs although certain of the preceding steps in the mechanical sequence have not yet been carried out or completed. The convertible roof actuation control unit registers this and switches the hydraulic pump off after a few seconds.41Convenience electronicsRoof control system overviewSensorsConvertible roof actuation button E137Sunroof button E325Central switch for window regulators in driver door E189Luggage cover contact switch F364Hydraulic pump temperature sender G555Convertible roof actuation control unit J256Front sender for position of left roof member G556 Front sender for position of right roof member G557 Sender for left roof member locked G558 Sender for right roof member locked G559 Left sender for rear window frame locked G560 Right sender for rear window frame locked G561 Sender for rear window frame open G562 Left sender for rear shelf locked G563 Right sender for rear shelf locked G564 CAN data bus Sender for roof stowed G565 Sender for left roof member flap open G566 Sender for right roof member flap open G567 S379_1542Control elementsPower operated convertible roof valve N272, Power operated convertible roof valve 2 N341 Power operated convertible roof valve 3 N342Convertible roof actuation hydraulic pump V118Sliding sunroof motor V1Power latching control unit J657 Power latching motor V329J285 Control unit with display in dash panel insertS379_15943Convenience electronicsElectrical componentsConvertible roof actuation control unit J256The striking feature of the convertible roof actuation control unit is its basket-shaped bracket. This guarantees that the control unit's heat sink is adequately ventilated (forced ventilation). In addition, an integrated temperature sensor monitors the temperature in the control unit.S379_154S379_069Redundant sensors Redundant means that something is fitted more than once. In technical systems, redundant components serve to maintain operation even if one of these multiply fitted components should fail. The second sensor's signal can also be used to determine the plausibility of the signal. The control unit thereby monitors the function of the redundant sensors. The convertible roof sensors' installation in pairs ensures that the locked end positions can be detected in convertible roof movement, thereby enabling safe operation. The following sensors are fitted in pairs in the CSC convertible roof sensor system: The front senders for the position of left/right roof member G556 and G557, The left/right senders for rear window frame locked G560 and G561, The left/right senders for rear shelf locked G563 and G564, The senders for left/right roof member locked G558 and G559 and The senders for left/right roof member flap open G566 and G567.44Electrical components - sensorsFront sender for position of left roof member G556 Front sender for position of right roof member G557Both sensors are Hall senders with an integrated reference magnet. They are installed on the left and right sides of the cowl panel above the windscreen. They are electrically connected to the vehicle wiring harness via the A-pillars.Signal use The sensors indicate that the CSC convertible roof has docked onto the cowl panel.S379_118Electrical circuitEffect in the event of failure If one of the two sensors fails (short-circuit or open circuit), the other sensor's value serves to check whether the CSC convertible roof has docked onto the cowl panel and is therefore closed. If the side members have already docked onto the A-pillars, subsequent sensor failure has no effect unless roof movement is started again. If a sensor fails when the convertible roof is closed, roof movement cannot be started. If both sensors fail, roof movement is no longer possible.J256S379_135 G556 G55745Convenience electronicsSender for left roof member locked G558 Sender for right roof member locked G559The sensors are located at the front in the roof side members at the locking mechanisms for locking the roof side members to the A-pillars. These are Hall senders with integrated magnets, whereby the locking hook acts on the sensor.S379_149Signal use The signal from these sensors indicates that the CSC convertible roof and the A-pillars are locked or released. If the sensor detects that the lock is open, this means that the roof side members are released and that roof package lowering can be released from this point of view. The signal additionally indicates that roof movement has commenced or that the convertible roof is no longer located in the "closed" position.Electrical circuitJ256S379_136 G558 G559Effect in the event of failure If one of the two sensors fails when the convertible roof is not completely closed, the other sensor's value serves to check whether the CSC convertible roof and the A-pillars are locked or released. In this case, the convertible roof actuation control unit increases the hydraulic cylinder actuation time slightly, to rule out the fact that a mechanical blockage in the roof mechanism is delaying lock engagement and that this is the reason why the anticipated sensor signal has not been received. However, only one sensor's signal cannot be used to determine whether both roof side members are correctly locked to or released from the A-pillars. If this fault occurs when the convertible roof is already partially open, convertible roof operation can be continued until the "roof closed position" is detected.46Left sender for rear window frame locked G560 Right sender for rear window frame locked G561The sensors are positioned at the height of the C segment locking hooks in the left and right roof side members. With the aid of two external magnets on the locking hooks, these determine the locking status of the C segment to the roof side members and therefore the M segment.S379_119 G560/G561 Locking hookElectrical circuitSignal use These sensors' signal indicates that the C segment is in the "closed" position and is locked to the roof side members. If the sensor detects that the lock is open, this means that the C segment is free to pivot over the M segment.G561J256G560S379_137Effect in the event of failure If one of the two sensors fails when the convertible roof is not completely closed, the other sensor's value serves to check whether the C segment is locked to the side member. In this case, the convertible roof actuation control unit slightly increases the actuation time for the hydraulic cylinders in the roof side members, to rule out the fact that a mechanical blockage in the roof mechanism is delaying lock engagement and that this is the reason why the anticipated sensor signal has not been received. However, only one sensor's signal cannot be used to determine whether the C segment on both sides of the vehicle is correctly released or locked. If this fault occurs when the convertible roof is already partially open, convertible roof operation can be continued until the "roof closed position" is detected.47Convenience electronicsSender for rear window frame open G562This Hall sender with integrated magnet is located in the left roof side member in the vicinity of the hydraulic cylinder for actuating the C segment.Signal useG562The signal indicates that the C segment is located in the "open" position and C segment movement over the M segment is therefore completed.S379_120Effect in the event of failure Without this sensor's signal, the convertible roof actuation control unit is unable to directly determine whether the hydraulic cylinders have opened the C segment completely. Via the other sensors, it only knows that the C segment is not closed. As it cannot be ensured, without this signal, that the C segment has reached its end position over the M segment, roof movement is interrupted.Electrical circuitJ256S379_138 G56248Left sender for rear shelf locked G563 Right sender for rear shelf locked G564The sensors are positioned at the height of the hooks which lock the rear lid to the body on the left and right sides of the vehicle. With the aid of two external magnets on each locking hook, they determine the components' locking status.G563/G564 Locking hook with reference magnets,Signal use The signal from these sensors indicates that the rear lid is located in the "locked" position and is therefore linked to the body or is located in the "released" position and can therefore be pivoted open. If the sensor detects that the lock is open when the roof is closed, this also means that the lower C segment is no longer locked to the rear lid. It can therefore pivot over the M segment. When the roof is closed, this signal additionally indicates that the C segment is locked to the rear lid. This signal is additionally used to check the plausibility of the fact that the rear lid is moving in the "open" direction.S379_121Electrical circuitJ256G563G564S379_139Effect in the event of failure If one of the two sensors fails when the convertible roof is not completely closed, the other sensor's value serves to check whether the rear lid and the C segment are located in the locked/released position. In this case, the convertible roof actuation control unit slightly extends the initialisation time for the hydraulic cylinders in the rear lid securing frames, in order to rule out the fact that a mechanical blockage in the roof mechanism is delaying lock engagement and that this is the reason why the anticipated sensor signal has not been received. However, it is not possible to determine with the signal from just one sensor whether the rear lid and, in certain cases the C segment, is locked on both sides. If this fault occurs when the convertible roof is already partially open, the convertible roof can only be closed.49Convenience electronicsSender for left roof member flap open G566 Sender for right roof member flap open G567G566 and G567 are also Hall senders with integrated reference magnets. They are located at the hinges of the left and right roof side members. If a roof side member flap opens, the flap carrier moves into the detection range of the Hall sender. This leads to a change in signal voltage and indicates to the convertible roof actuation control unit that the roof side member flap is open.Roof side member flap hingeG566/G567S379_124Signal use This signal indicates that the rear lid is open and the roof side member flaps are in the "open" position. The path for stowing the roof package in the luggage compartment or for lifting the roof package out of the luggage compartment is free.Electrical circuitJ256G567G566S379_135Effect in the event of failure If one of the two sensors fails when the convertible roof is not completely closed, the other sensor's value serves to check whether the roof side member flaps and the rear lid are open or closed. In this case, the convertible roof actuation control unit slightly increases the actuation time for the hydraulic cylinders in the rear lid securing frames, in order to rule out the fact that a mechanical blockage in the roof mechanism is delaying flap contact and that this is the reason why the anticipated sensor signal has not been received. However, only one sensor's signal cannot be used to determine whether both roof side members are open or closed. If this fault occurs when the convertible roof is already partially open, convertible roof operation can be continued "roof closed position" is detected. The signals from sensors G563 and G564 serve the convertible roof actuation control unit as a substitute signal for "rear lid closed".50Sender for roof stowed G565This Hall sender also has an integrated magnet. This is located on the left-hand main hinge in the vicinity of the hydraulic cylinder for stowing the roof package.Signal use This signal indicates that the roof package is stowed in its end position in the luggage compartment and that the convertible roof is therefore open. In addition, the rear lid and the roof side member flaps can be closed or opened again. On closing the convertible roof, the sender's signal indicates that roof movement is taking place and that the roof package has left its position in the luggage compartment.S379_122Main hingeS379_123 G565Effect in the event of failure Electrical circuit On failure of the sensor, roof movement is only prevented if the convertible roof is fully open or closed, as the convertible roof actuation control unit cannot be certain that the roof package has reached its end position in the luggage compartment. If the sensor fails in an intermediate roof package position, the roof package is moved in the intended direction, either to stow or to close it. Convertible roof movement which is commenced after this is not continued. This means, for example, that the rear lid remains open.J256S379_140 G56551Convenience electronicsHydraulic pump temperature sender G555The temperature sender is integrated into the hydraulic pump and cannot be renewed. It measures the temperature of the hydraulic unit.Signal use The temperature signal protects the pump drive from overheating.S379_148Effect in the event of failure If the defect occurs when the convertible roof is completely closed, no further movement is possible. If the fault occurs when the convertible roof is already partially open, operation can be continued until the convertible roof "closed" position is reached. Of course, timeout checks (max. 8min, and max. 9.5min) by the convertible roof actuation control unit continue to be carried out.Electrical circuitJ256S379_142 G55552Luggage cover contact switch F364Contact switch F364 is located in the left-hand luggage cover mounting. The switch is designed so that it is open when the luggage cover is correctly enagged and closed if the luggage cover is missing or not correctly engaged.S379_055Signal use This signal indicates that the luggage cover is engaged and that roof movement can therefore be released.S379_054Electrical circuitEffect in the event of failure If a contact switch defect occurs when the convertible roof is closed or during convertible roof movement in the "open" direction, the convertible roof actuation control unit can no longer determine whether the luggage cover has been engaged. Convertible roof movement is not therefore released or aborted by the control unit. If the convertible roof is completely open, the luggage cover contact switch signal is irrelevant and the convertible roof can be closed.J256F364S379_14153C