Fuse for front passenger/rear driver windows blows
 

Hey, so my fuse for the front passenger/rear driver windows kept blowing out. So obviously, something with the wiring for the windows is off. I found a couple threads on here with similar problems and it seems that for most people this means the wiring usually right when it is about the enter the door (inside the rubber hose) is breaking. I isolated the problem to my rear driver's side window, it is for sure not the front passenger window.

Then I was able to figure out that the switch on the rear door does not blow out the fuse. While it didn't make the window go up or down (it's a new switch so it's not the switch), the fuse remained fine. But then when I tried to roll down the window from the center console, the fuse immediately blew.

Could this problem be related to the switch in the center??? My front driver's side switch works fine, so can only one part (the rear) of those center switches be broken or would it be the whole thing (front, rear and child safety)??? If it's wiring, would it be wiring to the center console switch or wiring to the rear door from the center console? Just hoping to narrow down where the problem is. I have the door panel off right now, and I removed the panel where the seatbelt connects to the wall. How am I supposed to inspect the wires??? I couldn't pull them to look at them nor could I see up where they go into the door. Do I have to destroy the rubber housing to see them?

Thanks,
David

Disconnect the plug at the switch for the rear and and see if the fuse still blows. Repeat with the front.

I would think that the problem would not be in the rubber tube that takes the wires through the space between the chassis and the door. Those wires are all hot, I think, with the return going through chassis ground. 'I would first look for a frayed wire somewhere between the switch on the console and the door. Try FI's test to see if you can further isolate the problem.

Ok, finally got out to work on the car today....

I disconnected the switch from the rear door and tried rolling down the window with the front switch and the fuse did not blow. Then I disconnected the front switch and tried rolling down the window with the rear switch and it still did not blow. In neither case did the window roll up or down though, as the window only rolls up and down if both switches are plugged in. The fuse also only blows if both switches are plugged in. And it seemed that the fuse only blew if the front switch was used.

So where should I look now? The wires going from the front switch to the rear switch?

Thanks,
David

You will most likely have a broken wire in the door post on the passenger side. I had same problem and had a broken wire in door post to passenger rear where the front seat belt mounts. I went thru a lot of fuses til I figured that one out! Easy to do just a bit time consuming when you are doing it the first time. Good Luck!

I had the same problem on the SD. Took almost one year to finally solve it.

Indlulge me.

Remove the switch from the RR door and install it in the LR door.

Try to blow the fuse.

Report back.

Well well well, it was the brand new switch I ordered from ******** AZ all along!!!

I took it out, put in the other one, and bam, working again, no fuses blowing, nothing. Well, I'm happy it's not a wire!!! That would have been much more annoying to fix.

Could it be because this switch is not an original Mercedes one... Just looked at the box, made in china.

Or could it be that it's my least powerful window and it couldn't handle a new switch??

David

Bingo!
 

Cheap is not good.
Good is not cheap.
Caveat emptor.

Cheap can sometimes be good, most of the parts I've ordered from ******** AZ have been genuine Mercedes made in germany parts and the prices are pretty damn cheap.

I'll for sure be making sure everything I order from there is from Germany if possible, no China crap. I'm not into buying products from China anyways.

David

Yes, that's what I figured.

It's got something to do with the change in design of the switch. I suffered through the exact same problem with a brand new switch from Performance Products. They were totally useless in helping me with the problem........just took the switch back and gave me credit.

I located a used switch........in very nice condition.........and it solved the problem.

I'm very glad to see that someone else has suffered this issue..........apparently, it's generic.

I did contact Mercedes Benz about this problem and, naturally, they stated that their OE switch would not have such an issue.

Who knows?

blown fuses here too
 

I'm glad to hear that you got it resolved. On my 87 wagon, I tried the switches and thought I had it licked, then POP i blew another fuse out of the blue. It turned out that the wires in the door jamb were failing. and the kids using the back doors caused it to be intermittent. Ended up splicing in new supple wire in the hinge area to facillitate movement. Hope your fix sticks.