Water leaked into the cabin and pooled in the left rear floor board. Now the central locking system doesn't work, the interior lights don't work. I've dried out the carpet and cleared the drain under the battery. Is it the ECM or the ECU that is damaged due to the moisture? Plus what's involved to change these devices?
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Re: water damaged 99 Audi A6 Avant
On right hand drive vehicles there is a 'convenience' ECU under the front passenger side carpet (I think it swaps and is under the right hand side in a left hand drive) This ECU operates and controls all the systems you have described, they suffer water damage very easily. This will be the cause of your problems and unfortunately will need to be replaced and coded. The ECU was put in this place to keep it well out of the way of any contamination such as water, then the cars ended up leaking water straight on to it! The carpet in the front can be lifted up from the edge by the door with a few trims removed. You probably had quite a lot of water in there because water runs to the back of the car, by the time its visible in the back a lot of water has entered. Let me know if you want anymore imformation.
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Either it can be issue with blown fuse controlling the central locking or its issue with central locking control module.Many a times these module gets wet,due to water getting collected there and after that such problem starts.Clean the water and dry that area and recheck,if its working.
--------- For more help,i suggest click the link below and try the troubleshooting to resolve these issue:---
For 2007 Audi A6 depending on the engine type, there are two placements for cabin air filters: 1. The cabin air filters are placed on the right bottom side of the central console - passenger side, for 2007 Audi A6 Avant. Remove the carpet and behind the plastic cover are cabin filters. When installing new filters see for the correct position - air flow is indicated by an arrow. See pictures below:
2. For the second placement, besides you need to remove the glove box for access and replace cabin air filters. Check first your car situation. If you will give me your e-mail address, I will send you photos with cabin filters replacement for 2007 Audi A6, because the www.fixya.com website is limited to 150 kb traffic.
I have the same problem - it is the central locking controller found under the passenger seat footwell carpet. If water has got into the footwell it will form a pool in the control unit. The connectors will rot after time and perhaps the unit PCB inside the non-waterproof casing may also be damaged.
It is not easy to get at this - remove the glovebox and wrench away at the moulded carpet and see if there are signs of damage (especially you are aware of water ingress).
i just solved this on my A6 quattro check the level in your expansion tank (left side of engine bay) if level is low then top up with long life dual anti-freeze/coolant,saves any probs if we have a harsh winter, if full pump on the radiator feed to help relieve poss blockages and make sure water is flowing through the system
Dirt under the battery. Remove the battery-plate(metal) and clean up in the bottom hole. Beacuse of the dirt in the hole the rain water stand still and after a while the water start to find its way to the cabin of the car. You cant fix it in 5 minutes.
Part number: 4B0819439C.
Filter element (dust and polen filter) with odor and harmful substances filltration. Placed on the right side of the car, (engine bonet raised), under cover plate for water box (also for battery box), and under water deflector at the bottom of the windshield - right side for Left Hand Steering wheel.
!!! For Right Hand Steering wheel cars the cabin air filter is placed on the left side !!!
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