Door Control Module

[EdA4]

When I bought the car the driver's door would unlock remotely, but not the passenger door. After a few days the driver's door packed up too.

I changed the passenger door module for one from a breaker, which worked half-a-dozen times, then stopped. I exchanged it for another, which didn't work at all. I swapped the driver's door one, and this didn't work either, so I exchanged it, and again the replacement didn't work. 

Also the key operated window lift which has worked up to now stopped working!

I'm wondering if I've been unlucky with 2nd hand units, whether I've been given the wrong parts, or whether there's something else going on.

As far as I can tell the door control modules are all part number 4F095979 and then 2 for NSF, 3 for OSF, and 4/5 for the rear doors, but people list them differently. Also there's a range of suffix letters, I've come across P, E, T & C so far.

Can anyone tell me what part numbers I should be looking for, and suggest any explanation for my lack of success?

On the +ve side, I'm getting pretty slick at taking the door cards off!

Thanks

[cliffcoggin]

A common problem is breakage of the wires in the rubber bellows between door and frame.

[Steve Q]

Also have you done any diagnostic check to see if any fault codes flag up?