Question about 2004 Audi A4

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Electrical fault i have water leaked into the passenger footwell. since then the alarm system stopped working, and the power windows have stopped working as well. also the interior lights will come on while driving getting brighter and dimmer. have stopped the water but dont know where to look for the electrical fault... can anyone help??

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Under the carpet of the footwell is an ECU (electronic control unit). Its a convenience control unit and it manages all the electrical things you described, and more. The water has obviously caused a fault with the unit. You will probably need a new ECU which will need to be coded, ideally at a dealer. They are not cheap so be sure to fix the leak at the same time to prevent a repeat. I have heard of rain water collecting at the bottom of the doors and then spilling over the seals. Also on avants rear washer pipes can pop apart in this area.

Posted on Jan 21, 2009

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