W211 RHS door mirror random movement

[LucyMoore]

Hi,
The driver's (rhs) door mirror on my w211 e class has developed a mine of its own . It will be fine for ages then will, for no apparent reason, tilt itself up as far as it will go and the door controls won't bring it back down.

There also seems to be an issue with the heating on that mirror not functioning.

I've had the mirror apart and done continuity checks on the wiring, as my first thought was the usual broken wires, but they all buzzed out fine, and the revised design of the mirror looks like there's no real stress points for the wiring when the mirror folds.

I'm fairly sure it's to do with water penetration as this time it started after I'd had the car washed, and it seems to only really happen in the winter months.

My current thought is that the door control module may be faulty. Had anyone else had and solved this issue?

 

[Steve@Avantgarde]

I had a CLK last week where the indicator and mirror on the left side were doing strange things. Turned out that a previous repair had been undertaken and the wiring plug for the DCM had been placed outside of the door panel soundproofing allowing water to enter the plug and sending the CAN interior network into meltdown.

It could be the DCM that is faulty on yours, but I would carry out some solid diagnosis to confirm that rather than guess.