The Touran Electrical System - VolksPage

Service.Self-study programme 307The TouranElectrical systemDesign and function

The networking technology, used until now onlyin luxury class vehicles, will be a feature in compact vans, such as the Volkswagen Touran.This self-study programme is designed to helpyou better understand the networking concept ofthe Volkswagen Touran.The control units installed in this system alsomanage tasks that were previously carried out byrelays and switches. In order that these tasks canbe fulfilled efficiently, the units have to exchangea great deal of information (data) between eachother. Such a high rate of data transfer wouldonly be possible with a large number of cables ifstandard means were used, such as wiring connections.To keep the number of wiring connections at amanageable level, Volkswagen favours the useof data bus connections on a wider scale.It covers the allocation of control units to thevarious data bus systems, the fitting locations ofrelay slots, fuses and control units. Furthermore,it describes the various functions of and changesto the diagnosis system.S307 050NEW2This self-study programme explains the designFor the latest testing, setting and repairand function of new developments.instructions, please refer to the relevantThe contents will not be updated.workshop literature.ImportantNote

ContentsIntroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4LIN data bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Onboard power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Data bus diagnosis interface . . . . . . . . . . . . . . . . . . . . . . 24Onboard power supply control unit . . . . . . . . . . . . . . . . . 28Windscreen wiper system. . . . . . . . . . . . . . . . . . . . . . . . . . 38Rear window wiper system . . . . . . . . . . . . . . . . . . . . . . . . 44Dash panel insert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Immobiliser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Convenience and infotainment settings . . . . . . . . . . . . . . 54Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56Test yourself . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 583

IntroductionFuse boxes and relay slots in vehicle's electrical systemFitting locationsThe onboard power supply of the Touran isdecentralised. For this reason, the fuse boxesand relay slots are installed at various locationsin the vehicle.The adjacent diagram shows the various fittinglocations.Electrics box on leftin engine compartmentBack-up fuse box on leftin engine compartment4

Relay carrier onleft under dash panelRelay carrier on onboard power supplycontrol unit on left under dash panelFuse box onleft under dash panelS307 0015

IntroductionThe networking conceptOverview of networked control unitsIn order that data can be transferred betweenthe control units, these are networked via variousdata bus systems.T16J220The data bus diagnosis interface J533 (gateway)provides the interface for the data buses:J431-Drive train CAN data busConvenience CAN data busInfotainment CAN data busDash panel insert CAN data busDiagnosis CAN data busJ285J533Drive trainCAN data busCAN data buslineConvenienceCAN data busCommunications lineInfotainmentCAN data busLIN data buslineJ503RJ345J412LIN data busJ519CAN data busSensorJ525Dash panel insertCAN data busJ255Diagnosis CANdata busJ162S307 049In addition to the CAN data bus,a number of electric components arenetworked via the LIN data bus.The data protocols have been changed. Therefore, these control unitscannot be exchanged with those ofother vehicle models e.g. Touareg orPhaeton.6R78J136J604J388

4RR78T16Operating unit in steering wheelSteering angle senderInterior monitoring sensorVehicle inclination sensorESP sensor unitAnti-theft alarm signal hornABS with EDL control unitSeat adjustment control unitHeating control unitAutom. gearbox control unitMotronic control unitAirbag control unitClimatronic control unitControl unit with display in dashpanel insertTrailer detector control unitDoor control unit, driver sideDoor control unit, front passenger sideDoor control unit, rear leftDoor control unit, rear rightConvenience system central control unitWiper motor control unitCellphone electronics control unitHeadlight range control, control unitParking aid control unitPower steering control unitControl unit with display for radio andnavigationOnboard power supply control unitDigital sound package control unitSteering column electronics control unitdata bus diagnosis interfaceWiper motor control unitfront passenger sideSelector lever sensors control unitAuxiliary air heater control unitRadioTV tunerDiagnosis connectionG384S307 0027

IntroductionControl units in drive train CAN data busControl units and fitting locationsThe adjacent diagram shows the controlunits that belong to the drive train CAN data busand associated fitting locations.The data is transferred at a speed of 500 kbit/s.Transfer is made via the orange/blackCAN high line and orange/brown CAN low line.To make data transfer more efficient,the CAN lines are entwined.Airbag control unit J234under centre consoleABS with EDL control unit J104under bulkhead inengine compartmentMotronic control unit J220under plenum chamber cover8

Control unit forheadlight range control J431on left under dash panel,on tunnel supportdata bus diagnosis interface J533under dash panel,above relay carrierS307 003Automatic gearbox control unit J217in wheel housing9

IntroductionThe control units in the drive train CAN data busControl units and fitting locationsShown in the diagram are the control unitsof the convenience CAN data bus and their fitting locations.The speed of data transfer is 100 kbit/s.The data is transferred via the orange/greenCAN high line and orange/brown CAN low line.Both CAN lines are entwined together.Steering column electronics control unit J527on steering column switchConvenience system central control unitJ393on right under dash panel,near centre consoleClimatronic control unit J255in centre console10

Parking aid control unit J446in rear right side partTrailer detector control unit J345in rear right side partOnboard power supply control unit J519under dash panel, on relay carrierDoor control units J386, J387, J388, J389in doorsS307 004data bus diagnosis interface J533under dash panel,above relay carrier11

IntroductionThe control units in the infotainment CAN data busControl units and fitting locationsThe control units of the CAN data bus and fittinglocations are shown in the adjacent diagram.The infotainment CAN data bus transfers data ata rate of 100 kbit/s. The CAN high line isorange/purple and the CAN low line isorange/brown.Both CAN lines are entwined together.Cellphone operating electronicscontrol unit J412on front right in footwellHeater control unit J162on front right under wing12

Control unit with displayfor radio and navigation J503or Radio Rin centre consoleS307 00513

IntroductionThe control units in the dash panel insert CAN data bus and in the diagnosisCAN data busThe dash panel insert CAN databus and the diagnosis CAN databus are new data bus connectionsin the Volkswagen Touran.Dash panel insert CAN data busThe data bus transfers data from thedash panel insert to the data bus diagnosis interface. The control unit with display unit in the dashpanel insert and the data bus diagnosis interfaceare the only controlunits attached to this data bus.Diagnosis CAN data busData transfer between the diagnosis connectionT16 and the data bus diagnosis interface is viathe diagnosis CAN data bus.Rate of data transferThe rate at which data is transferred is500 kbit/s for both CAN data buses.14Control unit with display unitin dash panel J285

data bus diagnosis interface J533under dash panel,above relay carrierS307 006T16 Diagnosis connectionon left in footwell15

LIN data busThe LIN data bus as sub data bussystemGeneral descriptionA sub data bus system connects control units withtheir electrical components. Among these components are, for example, control units, switches,sensors, actuators etc. This type of connectionand data transfer is used in the Volkswagen Touran for a number of systems.As a sub data bus system, the LIN data bus hasan advantage in cost.The designation LIN stands for local interconnectnetwork, and it means that all the associatedelectrical components are within a set andlimited area of the vehicle.It is possible for a number of LIN data bussystems to be installed in a vehicle. They will eachhave different functions to perform.A LIN data bus system consists of a master control unit and one or more slave control units.The master control unit is also networked withother control units (apart from slave control units)in the vehicle via the CAN data bus. This permitsthe transfer of data to other LIN data bussystems and other CAN data bus control units.LIN data bus systemdata bus diagnosis interface J533CAN busLIN data busAnti-theft alarm system horn H8LIN slaveInterior monitoring sensor G273LIN slaveConvenience system central control unitJ393CAN user and LIN masterVehicle inclination sender G384LIN slaveS307 00716

Data transferThe data is transferred at a speed of 1 kbit/s to20 kbit/s.The rate of data transfer is therefore a maximumof 20% of the rate for convenience orinfotainment CAN data buses and is fixedin the software of the LIN master.This transfer is made via data leads that are violet in basic colour with a white identificationmark. The cross section of the wire is 0.35 mm2.The LIN data bus is a single wire bus. The datalead is not screened.S307 008Recessive levelSignal levelThe signal level of the LIN data buses is eitherclose to battery voltage (UB) (recessive level) orearth (0 Volt) (dominant level).UUB0Dominant leveltS307 00917

LIN data busMaster control unitThe control unit connected via the CAN data bussystem performs the master functionsin the LIN data bus system.The transfer of data between master and slave isalways initialised by the master. A slave is notcapable of communicating independently.Among these master functions are:- Data conversion of LIN data bus messages tothe data format used by the CAN data buses,if and when these messages are required.- The control of data transfer in theLIN data bus and monitoring of the datatransfer rate.- The transfer of diagnosis data to theLIN slave control unit.Master control unitSteering column electronics control unit J527Users of convenience CAN data bus andmaster control unit in the LIN data bus18

Slave control unitThe slave function could be taken on by controlunits such as the multi-function steering wheel,actuators such as the anti-theft alarm horn orsensors such as the vehicle altitude sensor.The electronics integrated in the slave control unitevaluate the driver's input via the operating unitbuttons in the steering wheel, they convert theinput into digital information e.g. "radio louder"and send it when required to themaster control unit via the LIN data bus.The sensors also have electronics that transferthe measured values digitally to the mastercontrol unit.Slave control unitSteering wheel operating unit E221Slave control unit in LIN data busS307 01019

Onboard power supplyThe electrics boxFitting locationThe electrics box can be found on the left in theengine compartment.DescriptionAll fuses and relays that safeguard or controlcomponents in the engine compartment, arehoused in the electrics box (E box).A wiring guide to the interior and back is therefore no longer necessary. Fault finding is simplified, safeguarding is adapted more effectively tothe consumers and multipleassignment of fuses is largely avoided.Electrics boxS307 01220