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S204 Rear doors won't work off key

nathanrobo

New Member
Joined
Feb 11, 2017
Messages
27
Car
C320 sport CDI S204 AMG / S211 E320 CDI Avantgarde
Is there anyone out there that knows the W204 really well? I have the estate and for some time now, I've had to lock the rear doors manually. I have a buddy with a similar model and was able to swap out both rear door control modules and could confirm both as working.

If I open the door and operate the controls, I can hear the door trying to lock - any clues??

As you know, access to the rear of the door lock is via an aluminium plate with factory rivets - so I haven't stripped this off yet (only the door cards to get to the modules).

Conclusions so far... 1. Given that it's the rear doors, could it be the SAM unit? 2. Could it be a wiring fault? 3. Is there anything else that is common to both rear doors that could fail? 4. How likely is it that two components could fail (one in each door)?
 
Get the car scanned with STAR (or iCarsoft) - faults with door control modules or SAM are likely to show on STAR.

And I agree with your logic that if the door control modules are both fine then the next point of failure up the chain in potentially the rear SAM.
 
Get the car scanned with STAR (or iCarsoft) - faults with door control modules or SAM are likely to show on STAR.

And I agree with your logic that if the door control modules are both fine then the next point of failure up the chain in potentially the rear SAM.

Thanks for the confirmation. I've disconnected the rear SAM - nothing on visual inspection. Next step STAR!
 

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