2005 A4 central locking issue.

[blade7]

My B7 Avant drivers door has stopped unlocking with the remote, all other doors/tailgate still unlock and all doors including drivers lock using the remote. Now I have to unlock the drivers door using the key, tried WD40 in the lock and recoding the remote, holding the door handle up while pulling the interior door release but no fix. What's next ?

[AGK]

Check the door module? Cracked solder on the board maybe?

[blade7]

Where's the module located ? Tried to check the wiring between the body and the door as I've read it can break there, disconnected the rubber boot from the body side but couldn't get it off the door.

[msremmert]

My Passat did something similar - but intermittently. It's a 55 plate so I can't imagine the parts are much different.

The Passat forums advised slamming the door a few times (seriously) and funny enough it would play ball after a combo of swear words, door slams and using the internal door-release - but I just didn't have the heart to keep beating up my Passat.

What appears to have fixed my problem was getting some oil spray and using the red straw from a WD40 can to aim a measurable amount down the lock.

No guarantee it won't do it again and then I'll start looking at the above but a free fix is better than no fix.

[blade7]

msremmert said:

My Passat did something similar - but intermittently. It's a 55 plate so I can't imagine the parts are much different.
What appears to have fixed my problem was getting some oil spray and using the red straw from a WD40 can to aim a measurable amount down the lock.

Tried WD40 in the keyhole and around the lock until it dripped out the bottom of the door. Initially after unlocking with the key it would unlock with the remote but now it's the key only.

[blade7]

msremmert said:

The Passat forums advised slamming the door a few times (seriously) and funny enough it would play ball after a combo of swear words, door slams and using the internal door-release -

Tried this, no worky... .

[blade7]

Any ideas anyone ?

[Mr-captain]

If it's like the rest of the VAG range then the micro switch in the door lock has a tendency to fail causing the car to think the door is open. WD40 in the lock sometimes temporarily fixes it but ultimately the micro switch needs replacing. Either by replacing the whole lock module or disassembling the lock and replacing the switch.

If you have access to vagcom you can use one of the measuring blocks on the comfort control module to see the status of the switch.

[blade7]

Thanks for the reply, as AGK suggested also. I know someone with VAGCOM I'll ask them to do a test.

[renorti]

get a door lock off{ module} ebay,about £30. job done.

[blade7]

Seems to have sorted itself out, been working OK for a while now .

[blade7]

After working for months it's started playing up again, how do I replace the door micro switch ?

[annodomini2]

It's much easier to replace the whole lock unit, once you have the lock units apart, getting them back together correctly is a pig of a job.

[blade7]

annodomini2 said:

It's much easier to replace the whole lock unit, once you have the lock units apart, getting them back together correctly is a pig of a job.

Not sure if we're talking about the same thing but saw a clip on youtube, the locking module is held together with screws around the outside. Split it to access the micro switches. How hard is it to remove the module though ?