C200 Electric Window motors

[C200 goblin]

My ongoing problem with the windows still goes on,although at least now I am more familiar with the components used - no thanks to Haynes manual.

Yesterday I spent the afternoon in the hot sun stripping down the car. The usual, disconnecting the battery for 15 minutes, gives the front windows juice again to move. However the front drivers window still would not move and would hear a click in the door, which I thought was the motor - but it was not.

Under investigation I realised what is described as the infra red control module on the drivers front door in the Haynes manual is the electric window relay. I asked people here before if there was a relay to which I was told no, I now know there is, I also opened up the relay box, and they were on all four doors. I had thought it was that causing the drivers door window not to open, but when I swapped both front left and right ones,it was funny, pressing the left button controlled the right window and vice versa (so the correct relay must be used) However I took the drivers door motor off (3 torx T30 screws holds it to the regulator). I put it on the left window control and then it just made the relay click,so I now know the motor is gone.

I opened the motor and then realised that the magnets had get stuck back keeping them away from the armature. The copperwire connected to them had them gripped behind the plastic edge,so I released them and it went forward.ALthough alil worn,to prevent themfrom catching again. I put plumbers mait behind it. SO now fitted back it works perfect.

Window motor

Reverse side of drivers electric window motor

Motor opened

Centre shaft that the magnets touch on

Magnets pushed forward in the position they should be

Motor attachment plug next to regulator arm

THe door electric window relay which has the 'R' for right on it.(the item Haynes calls an infared module for the central locking)

 

[television]

Well done, the things that you call magnets are in fact the carbon brushes.

You are doing well.

It could have been me that said that there were no relays in the door, sadly if it was they are not shown. Its very hard sometimes, the time taken searching can go into hours

 

[Ellsy Tanners]

The units in the doors are the door control units, Mercedes call them DCM 1,2,3 or 4 depending which door. they are not reallys as such!!

 

[television]

The units in the doors are the door control units, Mercedes call them DCM 1,2,3 or 4 depending which door. they are not reallys as such!!

Thats nice to know, as i understand that there had to be something as the switches cannot carry the required current.

I will know the next time

 

[C200 goblin]

I seem to have cured the problem by an unusual way.
I had to replace the roof headlining as the vinyl on old one started to peel away from the foam backing, suprised this happened with a Benz - but after all it is in the sweltering heat of the Caribbean.
However to change it I had to remove the rear interior light, front interior light and front interior sunvisor mirror light wires, also sunvisors. I also removed the triangle shape cover for the interior alarm movement sensor.
Since reconnecting it back with a new headlining over 3 weeks ago, I have not had a problem since with the windows. They are working perfectly. They were going and kept freezing before almost every few days, most it would have last was 4 days without pulling the fuse to reset it.
I guess the interior light circuit has something to do with it as it is on the same fuse circuit as the front windows. The fuse that had most of the problem for the drivers side was fuse number 3 in the boot.

ONe thing I noticed now is that the field on the remote for the keys is weak since this. I have to go right up to the door sensors now to open it. It is not the key as I just tried 2 other brand spanking new spare keys and had to go right up near the door handle sensors to open it.

 

[Shala]

I had an auto-electrician come & check the window problem on mine & he said normally the main window control unit is on the driver side. As Mercedes is a German car which is a left hand drive car the main control unit is on the passanger side. he said my front windows stop working as the system is getting confused for some reason & it stops the right control from working too. Thats why when I disconnect the battery it clears the memory & windows start working again... for a short while. So I can either replace the left control unit or I can put up with it & keep unplugging the negative battery cable to reset the control unit.

 

[C200 goblin]

this seems very conclusive.I have to replace mine and see what happens.

 

[C200 goblin]

Found out a few years ago now, it was the rear door window motor module units. If they go bad, it corrupts the signal to the front windows, hence creating my problem stopping the front window for the side that was corrupted.
replaced both back window motors and the front has not played up again since that.

 

[television]

Found out a few years ago now, it was the rear door window motor module units. If they go bad, it corrupts the signal to the front windows, hence creating my problem stopping the front window for the side that was corrupted.
replaced both back window motors and the front has not played up again since that.

Indeed that is the case, and common to the 202/210 we are up to date on here now with this problem You should have posted back sooner.