Side Mirror Has a Mind of Its Own (HELP!)
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Senior Member
Joined: Dec 2014
Posts: 286
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CL55
Side Mirror Has a Mind of Its Own (HELP!)
My passenger rear view mirror will not adjust properly. When I press the ^ arrow it goes diagonally inwards and when I press the down arrow the opposite happens. When I press the inward or outward arrow it moves in a diagonal direction as well. It will not return to any presets correctly. However, if I manually move it around for a bit it will work fine but not for long. It seems as though it needs a reset. I have tried greasing the gears but that doesn't seem to be the issue. I looked around and it seems that this isn't a common issue. I haven't read of any special type of reset out there so I was going to try unplugging the battery overnight to see if that helps. Before I do that is there anyone that is familiar with the issue?
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Joined: Jan 2014
Posts: 3,966
Likes: 1,315
From: Republic of Texas
'99 and '05 E55 AMG
Try this:
https://mbworld.org/forums/e-class-w...tion-only.html
The mirror motors are controlled by a 3-wire connection back to half-bridge driver integrated circuits in the door control module. Any signals from a switch to the door control module are via CAN bus. Not at all like your father's electric windows.
The mirror housing (at least on my W210) has a very short harness from the mirror motor to another pair of connectors located under the mirror frame but inside the door. This hidden pair of connectors are a part of the door harness that connect to the door control module.
Check for continuity end-to-end (should be yes), continuity from harness to door frame (should be no), and continuity from one wire to another (should be no). The issue you describe could be two of the wires or their pins shorted together. Based upon your description of the diagonal movement, that suggests moth motors are activating simultaneously.
The end-to-end check described entails removing the door panel (you do have spare clips and industrial adhesive, right?), pulling the mirror harness connector from the door control module and the mirror motor, then using small probes (or a pin inserted into the socket and connect the multi-meter to that) to test for continuity. In my case, the problem was in the small door pocket hidden under the rubber gasket where the mirror frame mounts.
As a friend of mine likes to say, "Most electrical problems are really mechanical problems."
https://mbworld.org/forums/e-class-w...tion-only.html
The mirror motors are controlled by a 3-wire connection back to half-bridge driver integrated circuits in the door control module. Any signals from a switch to the door control module are via CAN bus. Not at all like your father's electric windows.
The mirror housing (at least on my W210) has a very short harness from the mirror motor to another pair of connectors located under the mirror frame but inside the door. This hidden pair of connectors are a part of the door harness that connect to the door control module.
Check for continuity end-to-end (should be yes), continuity from harness to door frame (should be no), and continuity from one wire to another (should be no). The issue you describe could be two of the wires or their pins shorted together. Based upon your description of the diagonal movement, that suggests moth motors are activating simultaneously.
The end-to-end check described entails removing the door panel (you do have spare clips and industrial adhesive, right?), pulling the mirror harness connector from the door control module and the mirror motor, then using small probes (or a pin inserted into the socket and connect the multi-meter to that) to test for continuity. In my case, the problem was in the small door pocket hidden under the rubber gasket where the mirror frame mounts.
As a friend of mine likes to say, "Most electrical problems are really mechanical problems."
Last edited by bbirdwell; Jul 30, 2015 at 01:38 PM.
