Question about Mercedes-Benz Cars & Trucks
Sorry, don't have one, but lookatit this way: The driver's door master switch has a hot wire to it, probably from a circuit breaker in the fuse panel, and a ground wire from master switch back into cabin to a nearby ground. Then the master switch has 2 wires to each window motor. Depending on the switch's up or down position, each wire will serve as a power signal to the motor or a ground signal back to the master switch. See? The other door switches each have a power feed wire to switch, so that switch can operate its window motor. They all work the same: Switch up or down will change the current flow to motor. The ground current flow always goes back into the master switch and then to that nearby ground.
Have I muddied it up enough for you? Well, sorry, Jim, guess you have to look at a diagram, then.
Posted on Aug 01, 2013
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Posted on Jan 02, 2017
Here are some diagrams from the ignition switch out. I can only post up to a certain size picture on here so it may be to small. If you need bigger pictures feel free to email me at firstname.lastname@example.org and I will be happy to send them to you. I also have a list of the wire colors and what voltage or ground is needed for each wire. This is pretty helpful because I have found through experience that many times the problem is not the switch but the body control module. The diagrams and stuff wouldn't cost anything to you so no worries there. I hope this helps and good luck.
Posted on Oct 03, 2011
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