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  1. #1
    Reverse Gear

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    Electrical issues

    Having strange issues with my 04 avant last couple of days.Everytime I switch my headlights off the tailgate opens.If I press the lock button next to the drivers door handle before I do this it doesnt open the tailgate.Anyone have any ideas?

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  3. #2
    Woorlord's Avatar
    shifting to Hyperspace... .

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    Strange combination of faults?

    "Power control unit" (PCU) deals with the headlights and the "Convenience module" (CM) deals with the locking/alarm etc., all interfaced to the door switch by CAN-BUS.

    PCU under steering wheel to lower right on RHD car.
    CM under front passenger seat.

    Does your remote open the tailgate OK?

    Perhaps a short in the loom between signals for tailgate lock and rear lights - may be worth tracking the loom and check for possible shorts or damaged wires?
    Looms should run under the internal plastic covers on top of sills - however would have thought lights and locking signals run on different sides owing to module locations.
    Therefore, one would assume possible wiring fault where the two wires merge together - maybe in the tailgate area - number plate lights and wire to lock motor probably close to each other??
    2001 A4 Saloon 3.0 Quattro Sport Tiptronic - Platinum Leather/Heated Front Seats/BOSE/DIS/Cruise Control
    Retrofits:GmBH Bumpers, F&R Ambient LEDS, OEM Valeo Xenons (D2S) & Headlight Washers, Auto-dipping RVM, Footwell Lights, Vent Control illumination, ISO-Fix, RNS-E & OEM Bluetooth + VIMhack + Video i-pod & Aux inputs, Rear PDC, Powerflow 100mm Tips, Reversing Camera
    2012 A4 Saloon 2.0 TDIe Technik (163ps)
    Diagnostics:VCDS HEX+USB+CAN Cable

  4. #3
    Reverse Gear

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    opens normally with remote ,works fine in every way.Just opens when I turn headlights off.I have replaced the lock mechanism recently as the microswitch inside was gone but it worked fine only the last couple of days its started acting up.

  5. #4
    Reverse Gear

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    update ,when I turn headlight switch off the lock actuator/rod is opening the tailgate, not the alarm/microswitch.Also while trying to solve this problem I have found that if I disconnect the harness plug from the back of the headlight/sidelight switch with it in the off position and turn the ignition to on but not start the headlights and side lights are all on,is this normal?

  6. #5
    NHN
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    Modmetractor

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    Would seem to be correct from a safety view, as if it doesnt detect the switch, then its better to have them on at all times as it doesnt matter if there on during day & better safe than sorry if the headlight switch failed at night huh, probably a default feature

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  7. #6
    J7USS's Avatar
    Shuddup Foooool!!

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