deezell

Yes, I had the same problem on a 2002 passat, rear door,I sold it with the problem still there, so I wasn't too surprised to see a similar one occurring on the A6. In this case the common fault is not the relay but the motor contact. Locks are expensive, and used ones are scarce, overpriced and probably have the fault or are on the way to it, hence my decision to get to the root of the problem. I've had three show this fault, and it's the same fix in each case. There are three relays also in the lock, one for sensing door closure and the other two sense the motor driven slide interlock positions. It's the failure of the right hand motor to reset it's slide that causes the problem, throws a fault on vcds, "infeasible output" or something like that. Incidentally. If you're wondering how a presumed open circuit motor seems to turn the cam to lock but not to open it, the smaller second motor driving the green slide interlock is connected by slip gearing to the right hand shaft, so though they operate independently on open, they are geared together on lock, hence both shafts turn. If the main motor contacts are partly conducting, you get the intermittent fault, whereby it sometimes has enough torque to unlock, but locking is not a problem due to the second motor.

royclark

That's a thought, I could get a used one, check it out as you did above and replace my lock with it.
Then I could repair my lock for a spare.

first.octopus

Front driver side door is having lock issue two weeks ago. It is going to be a weekend project. Do you roll up (or roll down) the window before removing the door panel for easy access to the lock? Thanks.

deezell

Roll up the windows, but access is not that easy as such. You need to unclip the outer door handle rod and as it's driver side, the rod from the key cylinder. Two star bolts from the inner edge, uncouple the power cable from the base of the lock, then drop and turn the lock to let the bowden cable inside. Remove this cable when you have a clear view of it, this will make it possible to remove the lock by turning it upside down the rotating it around the window carrier frame. It can be done, saves having to unbolt and lift out the entire window and carrier frame. I've not done a driver's side, I believe the lock cylinder rod requires special attention to remove, a small sliding clip. It's mentioned on other posts.

first.octopus

Thanks deezell. This is similar to my problem. It will unlock; but it won't lock. If I try press unlock and then lock with the remote, it will work 8 out of 10 times. But I can lock and unlock using the key. Look like the problem with the main motor does not have enough torque to lock the door.

I scan the car with VAG-COM. The only fault I got was this:

Address 42: Door Elect, Driver Labels: 4F0-910-793-42.lbl
Part No SW: 4F0 910 793 E HW: 4F0 959 793 E
Component: TSG FA H12 0210
Revision: 00000000 Serial number: VS
Coding: 0035563
Shop #: WSC 02327 785 00200
VCID: 2C57E2328FAB3A7E18B-8079

1 Fault Found:
02115 - Locking Unit for Central Locking
008 - Implausible Signal - Intermittent
Freeze Frame:
Fault Status: 00101000
Fault Priority: 3
Fault Frequency: 41
Reset counter: 7
Mileage: 121552 km
Time Indication: 0
Date: 2015.05.05
Time: 22:23:52

deezell

This is the same code I got with VAG COM, your problem is the reverse, unlocking but not locking intermittently. This is typical of a poor electrical connection, but perhaps in your case it is the other motor contacts. Only one way to find out, remove the lock, plug back in the cable,take off the cam cover and watch the shafts rotate on lock/unlock. ('close' the lock mechanism with a screwdriver first). It could also be a poor contact on one of the microswitch, but I would bet on a motor contact. At least with the drivers door you can use the key.

LMSI-G35X

What is the part number for this door lock? I need one for the FR door.

royclark

Put your car details in here - Audi - A6 - 2009 Teile Katalog (Pats Catalog)
- to find your part number.

royclark

My passenger door lock has put itself right. What caused mine to go wrong was, the wife tried to open the door at the same time as I unlocked it with the key fob, I think that this threw the lock timing out.
After repeated locking and unlocking it has sorted it self out.
It's been OK for months now.

Look at this - Please Help Tdi sport drivers door won't open from outside - Page 2

deezell

Part no. 4F1837016 Front Right US (passenger) door lock
See here AUDI A6/AVANT [A6] (USA) 2009: BODY: 83730. INNER ACTUATOR; DOOR LOCK