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Thread: Avant rear screen demister not working

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  1. Avant rear screen demister not working 
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    Morning all,

    Relatively new to the world of Audis and have a couple of minor gremlins with what is otherwise a great car. In short, the rear screen demister doesn't work. Pressing the button on the climate control unit with the engine running causes the LED tell-tale to illumintae for a couple of seconds but it then switches off - much as it would with the ignition off. If I manually hold the button in, the heater does begin to cut through the condensation, so the circuit is basically healthy. It is as if a relay is failing to latch?!

    Has anyone experienced anything similar?

    All help appreciated.

    Cheers,

    Andrew S
     
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  2. Re: Avant rear screen demister not working 
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    As you say, sounds like the relay needs replacing. Believe it has a timer built in to turn off after a preset time of say around 10 minutes or something like.
    02 A4 1.9TDI quattro sport
     
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  3. Re: Avant rear screen demister not working 
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    Update...

    Took the car to a local VAG independent this afternoon. Apparently there is no relay - the demister is operated by a "Convenience Control Module" located on the floor of the car.

    The verdict is that it is sensing a high resistance in the circuit and tripping. So, it could be a damaged or corroded wire pretty much anywhere in the circuit, or the control module itself...

    To quote the technician, "it won't be an easy fix". Oh joy.
     
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  4. Re: Avant rear screen demister not working 
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    Try cleaning the connectors on the CCM.
    Is your passenger side floor damp !
    A4 2.5 tdi QS (mapped)


     
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