Vehicle: 2004 C270cdi Avantgarde SE-A and 2006 B200 Turbo with AMG Sport Pack
Location: South East England
Electric folding mirror fault??
i have a c220 cdi coupe with electric folding mirrors but they have stopped working correctly so looking for some advise! The indicator on the passenger side has stopped working also and displays as an error on the dash, i have taken the mirror casing off and put it on drivers side connection to check it and the led's worked fine on that side so nothing wrong with them, nor are there any splits in the wire for the indicator on the passenger side so am at a loss as to why this is happening... is there a fuse anywhere?
Also the mirrors are folding in electrically but not out, if you push them back out they stay there, then if you press either fold-in or fold-out button they will fold in, but never fold out electrically... can't be a problem with the fold-out button on the dash as pressing it does do something... just not what it should... ie folds them in and not out!
Has anyone got any ideas how i can fix this and avoid taking it to the stealer!?
Hi, Did you get your folding mirrors fixed? Do you know what the cause was for the mirrors only folding in? My guess is it was the Front SAM or the Light/Mirror switch assy but it would be useful to know.
Hi, I fixed my folding mirror problem yesterday. It was the switch assembly but could have been the Front SAM. Took it apart and cleaned what looked like liquid damage. May have been the result of condensation though. To test it remove the switch and measure the resistance across pins 2 and 5 - should be around 900 ohms. Press the fold In switch and it should be around 160 ohms. Press the fold Out switch and it should be around 0 ohms. If the mirrors are In and the Out switch doesn't work you can also disconnect the cable from the switch and momentarily short pins 2 and 5. If the Front SAM is good the mirrors will fold out.
The SAM is a computer de-multiplexer. Basically all the control devices (switches) on the car are hooked to the front or rear SAM. Then, all the devices that need to be controlled (lights, motors) are hooked to the front or rear SAM. When you, as an example, step on the brake pedal, the front SAM notices this, generates a command that it sends over the CAN-bus to the rear SAM, and the rear SAM turns on the brake lights. When you switch on the turn signal, that signal goes to the front SAM, which sends commands to the instrument cluster and the rear SAM. The front SAM starts blinking the front turn signals and mirror signals. The rear SAM starts blinking the rear turns signals. The cluster makes the clicking sound and blinks the indicator light. This all seems very complex but it actually simplifies the wiring of the car. If you peek under the dash it's nothing compared to a mid-90s MB, where everything had to run everywhere.
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