Gentlemen (and Ladies),
MY 87 S4. Removed the 'outside' alarm (courtesy of original/PO) relative to 'Tricky AC problem' posted earlier. Had a keyless remote. Now when I use the key, only the passenger door opens and locks both as it should. On the drivers side, only that door opens and locks. The central control button activates both, hence functions normally. I am in the process of dealing with the 2 fuses behind the Board. Have been told that this has been seen before, and replacement of the driver side motor will be curative. I am curious in that the motor does have function, but will not be activated by key. If I get into the door, are there contacts/connections that can be remedied or are there switches within the motor that will make replacement mandatory (similar to a headlight motor scenario) ?
Thanks Guys

 

Fuse check first, then, the next step in the pursuit of the solution to this unsavory situation involves the removal and cleaning of the door switch pins. And a relay check. Do you have wiring diagrams?

Then, we go from there with a possible door panel removal --- and an adjustment based on the 9 page tech service bulletin for the earlier cars that carries over for the most part to the S4.

Note that the central switch has some unusual behavioral components, so be sure to doublecheck your owner's manual for what it does and under which conditions (doors open v. closed; locks in-synch v. out-of-synch)

 

Both low amp fuses behind Board good.
I have WD's and am good with them.
Locks are in synch. Where would I find this tech bulletin ? I have some, but not re the door lock adjustment. The WSM has some, but not of removal/cleaning of the switch pins. Thanks

 

WSM and wiring diagrams represent about 50% of the information that is critical and available for these cars. The other half resides, with WSM and Wiring diagrams, on the CD assembled by enthusiast Jim Morehouse, available via him or Roger at 928sRus.

This can help. But its for 83, so the electrical references won't apply. The mechanism description does. And you can see why you'd want to avoid this step unless absolutely needed.

Usually its electrical. There is involvement of window relay I think on these; spend quality time with wiring diagram and search to trace it.

The last few photos are of the door switches. 11 mm to remove, turning them slowly. I like to cut them off the wire and disassemble to clean, but its tricky. Gotta clean the door 'threads' too, where they screw in, sometimes rusty. I use vicegrips on the wire (which is too short), so it doesn't fall back into the door jam.

 

Thanks alot. I'm done for today. Really appreciate the input.