Service Audi A4 Electrical system Vehicle electrical system control unit J 519I/VK-5For internal use only Electrical System Trainer Information Vehicle electrical system control unit ____________________________________________________Contents: General function description Page 3 Light control Page 5 Light monitoring Page 7 Turn signal / hazard light control Page 9 Brake light control Page 10 Activation relay Page 11 Wiper / wash control Page 11 SG for trailer recognition Page 13 Emergency operation Page 15 Fault finding Page 16 Diagnosis Page 17 The trainer information is structured for the self study programme 254 – Audi A4 2001 is not a workshop manual. For maintenance and repair operation please use the current technical literature. I/VK-5 X Contents Technical Status October 00 2 Electrical System Trainer Information Vehicle electrical system control unit ____________________________________________________General function description Vehicle electrical system control unit By using a vehicle electrical system control unit the vehicle weight could be reduced due to less cable and a lower number of relays and control units. The functions Gateway Gateway - Wiper activation - Drive light activation with lamp control - Horn activation Driver door Passenger Vehicle - Load-reduction relay activation door module electrical module system - Turn signal and hazard light activation control unit Rear door module Rear door module - Brake light activation Steering column are taken over by the vehicle electrical system CCE Driver seat memory electronics control unit as a central unit. Trailer recog- Additional nition CU heater
Signal transmission is via the CAN bus Parking aid Tyre pressure check system Steering convenience with a speed of 100 kBaud. Air wheel There is an active data exchange between Multi-function electronics control unit conditioner - Steering column electronics in switch module Active data - Dash panel insert with Gateway to the CAN exchange bus drive - Steering wheel electronics module - Central convenience electronics CCE with the relevant door modules - Control unit for trailer recognition - Vehicle electrical system control unit - Multi-function control unit for special vehicles Control unit versions Low-line for standard equipment 8E0 907 279 C Low-line for vehicle with headlight washer system 8E0 907 279 A D The control unit index in brackets will be introduced in Model Year 2002 High-line for vehicle with DIS which comprises several new functions. driver information system 8E0 907 279 B E I/VK-5 X Contents Technical Status October 00 3Electrical System Trainer InformationVehicle electrical system control unit____________________________________________________ Fitting location: Front left footwell below dash panel cross member – instead of the earlier central electrics Country versions Depending on country various regulations apply for the vehicle lighting system. The various light activations are stored in the EEPROM and can be adapted to the relevant specific regulations via the coding. Vehicles that are exported into these countries are generally equipped with the high-line version even if a driver information system is not fitted. Activated components In the low-line version
the following functions are performed by the vehicle electrical system control unit: - Hazard light system - Turn signal - Window wiper - Washer pump incl. rear wiper activation in Avant - Activation of horn and load-reduction relay - HWS headlight washer system - Parking light right - Parking light left - Main beams right - Main beams left - Turn signal right - Turn signal left - Number plate lamps front and rear are activated together front rear and side are activated togetherI/VK-5 X ContentsTechnical Status October 00 4 Electrical System Trainer Information Vehicle electrical system control unit ____________________________________________________ In the high-line version
the lighting elements are activated individually including those marked with and in the low-line version. The following lighting units are activated additionally via the processor: - Dipped beam headlights left - Dipped beam headlights right - Fog light left - Fog light right - Brake lights left centre and right - Reversing light left - Reversing light right - Rear fog light. Voltage supply Normal operation min. Ubatt 9 V max. Ubatt 15 Volt An increased supply voltage of up to 6 Volt is permitted for the horn turn signal activation and wiper washer system with HWS functions.Light control Rear light
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莲花l3论坛>东风风神商务车价格High-line Side light ON In vehicles with driver information system the brake light filament in the 2-filament bulb is used as the rear light. For this purpose the 21 watt lamp is activated via a PWM signal to minimise the lighting power. Thus both rear lights are capable of diagnosis without additiona
l semiconductor elements and wiring. Brake actuated A defective 2-filament lamp is indicated by the failure of the 21 watt brake light filament. In the low-line version the contact for the 5 watt glow filament is present and activated. I/VK-5 X Contents Technical Status October 00 5Electrical System Trainer InformationVehicle electrical system control
c1>沃尔沃s802.5tunit____________________________________________________ Encodeable daylight driving lights Daylight driving The coding for the relevant country can be found lights Dipped beam in the coding table in chapter “Diagnosis”. Example: In vehicles destined for Denmark Finland Norway and Sweden with daylight driving lights without Xenon headlights the dipped beam headlights and sidelights are dimmed to 92. When dipped beam headlights are switched on Light switch the full lighting output is
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available.Headlight range control The headlight range control is dynamic and is activated by a separate control unit. The control unit is activated by a conventional connection to the rotary light control terminal 56b. Reversing light activation Low-line With conventional wiring via the reverse gear switch or the multi-function switch with multitronic/automatic gearbox. High-line For the reversing light activation the signals are transmitted to the vehicle electrical system control unit via the convenience CAN bus from the central convenience electronics. There the direct input from the rever
se gear switch or multi-function switch is available.I/VK-5 X ContentsTechnical Status October 00 6Electrical System Trainer InformationVehicle electrical system control
unit____________________________________________________Light monitoring The light monitoring differentiates between the test types cold and warm monitoring. .