[frobi]

2004 E320.
I have no power to the dimming and garage opener circuit.
I opened the mirror housing and both reading lights work as well as the little orange light underneath works, but when I check for power to the left circuit board (for mirror dimming A67, A67h 1-3))), there is no voltage. I tried all wires brown (ground) to blue and other wires. No power. Also there is no light when I press and garage door buttons.
All fuses are good. All dome light switches and lights work, sun roof works. Two separate wire sets feed that circuit. Rest are for lights and sun roof.
I want my mirror to dim at night. Any ideas?

 

[Ottin]

Check fuses.

If fuse is ok, it doesn't worth repair except you are a super handy man.


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[LasCondes]

I found this link from a W220 thread, but it could shed some light on your issue. I gave up on mine after garage door opener buttons worked intermittently.

http://www.benzworld.org/forums/w220-s-class/1677700-fix-randomly-rearview-mirror-darkening.html

 

[frobi]

I have no power going to the circuit board. Fuse is ok as I checked all fuses with a meter both on the driver side dash fuse box and in the trunk fuse box.
There should be power on the board between brown wire and blue wire or blue/black. I wonder if the mirror diming was disabled by the mechanic of the previous owner. If so how was it disabled ? Can star tool unable or disable the mirror ?

 

[Ottin]

I have no power going to the circuit board. Fuse is ok as I checked all fuses with a meter both on the driver side dash fuse box and in the trunk fuse box.

There should be power on the board between brown wire and blue wire or blue/black. I wonder if the mirror diming was disabled by the mechanic of the previous owner. If so how was it disabled ? Can star tool unable or disable the mirror ?

There is a fuse box in the engine bay just above LF wheel, did you check that?


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[frobi]

There is a fuse box in the engine bay just above LF wheel, did you check that?


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Thanks Ottin,
I checked that fuse box this evening as well. All fuses are good. Still no fix.

 

[konigstiger]

Two inputs support auto mirror dimming, forward sensor in the mirror housing (rear) and backward sensor in the mirror lens. Inside mirror is the master for the outside mirror dimming (driver side) is o/s it working properly. Prerequisite, no under voltage.