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Thread: Lights will not turn off

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  1. Lights will not turn off 
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    2004 a4 b6 1.9 tdi cvt.

    I was driving and noticed that my lights were on. I turned the rotary light switch to the ON position and the lights seemed to switch to the fog lights properly. When I turn off the engine the lights go off. The off position on the light switch leaves the lights on and I cannot turn them off.I have changed the switch and still have the same problem. Any ideas experts.
    Last edited by a4cvt; 12-10-2015 at 07:08 PM. Reason: car spec.
     
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  2. Re: Lights will not turn off 
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    If its not the switch I think you will need diagnostics to check whats happening
     
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  3. Re: Lights will not turn off 
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    Thank you for the reply. I have looked up the electrical system in the Haynes manual. They list a relay in the circuit as 17 'X' contact relay. Do you know where this relay is mounted so I can check it before I start looking at the power supply control unit.
     
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  4. Re: Lights will not turn off 
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    Run web searches for central electronic control module.
     
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  5. Re: Lights will not turn off 
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    If it was the switch that was faulty, now I have changed the switch would a fault code still be in the system?. If so how do I clear it.
     
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  6. Re: Lights will not turn off 
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    Was the new switch the same part number ?
    There are different revisions of switches.
    A4 2.5 tdi QS (mapped)


     
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  7. Re: Lights will not turn off 
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    The switch was identical. The part numbers matched each other. Does anyone know where the switch relay and power control module is located please.
     
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  8. Re: Lights will not turn off 
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    Update on lighting situation. Looks like the vehicle electrical system control module has become faulty. I have been quoted 251.00 +vat by the local VW indy to supply the unit. Is it necessary to program this module once it is installed?. Part number is 8E0907 279F
     
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  9. Re: Lights will not turn off 
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    Update on lighting situation. I bought a second hand module and fitted it today. Happy to report all lights now function correctly.
     
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