What is going on with these door control modules?
Thread Starter
Junior Member
Joined: Oct 2012
Posts: 57
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From: SRQ, FL
2001 S430 W220
What is going on with these door control modules?
I recently needed to replace the RIGHT side passenger DCM because my mirror blinkers quit working so I went shopping on ebay for one and turns out it didn't work at all. It seemed dead, seat buttons not working at all, etc. So I returned it, found ANOTHER one on ebay, same part number and all, description showed that it was tested, etc. and... SAME THING. Dead?? Nothing working. I even reset the battery connections. Does this thing have to be programmed with SDS? Could I have gotten two duds in a row?
Thread Starter
Junior Member
Joined: Oct 2012
Posts: 57
Likes: 8
From: SRQ, FL
2001 S430 W220
To clarify, I changed my driver's side too with a replacement DCM recently and it worked without needing to program it or do anything with DAS. The driver side DCM that I just got seems to be just SLIGHTLY different as it has a cooled seat function that my S430 doesn't have. I assume it came out of an S500. Can this miniscule difference cause the incompatibility?
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From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
I think that you can switch the seat control button section (which is not computerized) from the original DCM to the replacement. That being said, I would not have expected the mismatch to kill the other DCM functions.
Thread Starter
Junior Member
Joined: Oct 2012
Posts: 57
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From: SRQ, FL
2001 S430 W220
Oh yea, I did that right away. They are easy to swap but I'm just not understanding why two replacements aren't working at all and it's not that there's anything wrong with the door wiring or SAM, since the old DCM works just fine to move the seats (but mirror blinker doesn't). The driver side door DCM replacement worked just fine as well. Frustrated.
Thread Starter
Junior Member
Joined: Oct 2012
Posts: 57
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From: SRQ, FL
2001 S430 W220
Thread Starter
Junior Member
Joined: Oct 2012
Posts: 57
Likes: 8
From: SRQ, FL
2001 S430 W220
So my DCM saga continues. My third one arrived. This time the version number (I'm guessing it's a version number, the 3 alphanumeric to the left of the main part number, matched exactly my old one) Which is part 2208219851 , version Q05. Plugged it in and I was happy that it worked right away, the seat positions all moved fine, etc. The blinker ACTUALLY WORKED as well, BUT..... only for a few minutes. After a few minutes, the blinker stopped working. Reseated everything, checked my blinker light on mirror housing, nothing. AAaand it's basically back to how my old DCM was. This unluckiness I'm having with this crap is incredible. I wish I knew what on that piece of junk circuit board stops making the blinkers function. I am going to order a fourth one. I am not going to stop.
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MBWorld Fanatic!
Joined: Dec 2012
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From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
Do the turn signals use a standard fuse or an electronic fuse? When an electronic fuse finds a problem, it simply stops powering the circuit until the problem is fixed.
Thread Starter
Junior Member
Joined: Oct 2012
Posts: 57
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From: SRQ, FL
2001 S430 W220
Tusabes, my driver side blinker lights are identical and they have no problem. Plus LEDs draw way less current than bulbs, so I'm not quite certain that something is damaging the DCM or not.
Thread Starter
Junior Member
Joined: Oct 2012
Posts: 57
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From: SRQ, FL
2001 S430 W220
Also, putting a multimeter right on the mirror blinker connector, It's showing some weird, constant 8-9 volt output. Toggling the blinker changes nothing on the voltage. It seems like the DCM's voltage regulation for the blinker is yet again busted there shouldn't be a constant voltage here. My old original DCM showed no voltage whatsoever here and a properly function DCM shows a pulsating +11 or 12 V and then down to 0, then repeats, creating a blinking cycle.
