foamypirate

Looking for a little input on this one. Did a bunch of searching and nothing quite matched what I have going on.

2002 A4 Coupe

Symptoms:
Driver's control won't roll passenger window up or down, and won't control the power mirror on the passenger side. DIC shows RDCM as No Comm. Not so unusual...except the passenger side switch rolls it up and down fine, and both driver and passenger switches will control the locks (auto lock/unlock also works fine). Looking at the diagrams, that didn't make sense to me, since it appears that the RDCM controls these... if it's Non-Comm, how does it know to lock/unlock the door when requested from the driver side?

I played with the wiring harness in both door accordions hoping for an "easy" fix, but no luck. Does this just sound like a partially faulty RDCM? I initially thought it was just the driver switch panel, until I saw the RDCM No Comm in the DIC. Not really sure what to look at next. Electric isn't my strong suit, but I'd definitely prefer not to shotgun it with parts, just need a hand with next steps for troubleshooting.

foamypirate

Awesome info, thank you!

Checked the battery, and it was a bit low (12.06 volts). Put in a new one, and I'm reading at 12.59 volts now, so that's good. No change in behavior, unfortunately. Confirmed that the key fob and drivers control operate both door locks. If I get time this weekend, I'll tear into the doors and try swapping the modules and see what happens.

Thanks again for the assistance!

foamypirate

So, I'm finally getting around to troubleshooting this (was just living with it in the meantime. I've got long arms, so I just reach over to the passenger side. Any how, car is currently down for a steering rack replacement and I needed something to do).

I pulled the passenger side door panel off, and I found a DRIVER door module in it, 10342159. Does this possibly explain my issue? Or did GM use the DCMs interchangeably? Everything I see indicates it should have a 10342160 in it. I'm reasonably sure that would be the issue.

SilverC54me

You should have a passenger module on the passenger door. Check your drivers door to see if a passenger or driver module is installed there.

I should have a passenger module in storage. I will let you know over the weekend if I have one.

Gary

foamypirate

Thanks, I appreciate the offer! I actually ordered one from VetteNuts right before I saw your post, unfortunately.

foamypirate

Got my new used passenger module from Vette Nuts. Swapped the "new" drivers module from the passenger side over to my drivers side (newer part number that works with the module from Vette Nuts, versus my original drivers module), and installed the module from Vette Nuts on the passenger. Everything works great now!

Bill Curlee

Don't throw that module away. They are REPAIRABLE.

There are a number of parts on there that you can easily replace.

Glad it was that simple for you. Now DRIVE IT LIKE YOU STOLE IT! :-)

Bill