Passenger side mirror turn signal malfunction warning appeared on dash messages.  I ordered the replacement LED module (A1649061400) from the Mercedes dealership and replaced the old LED module.  After replacing the part the turn signal still does not work and I get the same warning on the dash.  All other blinkers work on both left and right, front and back.  I inspected the wiring and wiring harness but failed to test for power before putting it back together. Has anyone else experienced this problem? Is there a fuse that serves only this light?  Any help would be appreciated.  Thanks in advance. 


Good question and a very common problem.


From what I understand the LED was always fine and it was a problem in either the writing or the socket.

1. Firstly check the sockets. Check in the owner's manual to find the fuse panel under the bonet. I hope you looked there already?

2. You can try and test the relay yourself  from the fuse panel.

3. Maybe there is a problem with the switch and not the LED

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