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Mercedes Benz Rear Window Regulator Replacement
 
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Pelican Technical Article:

Mercedes Benz Rear Window Regulator Replacement

Steve Vernon

Time:

20 min

Tab:

$350

Talent:

*

Tools:

Phillips and flat-head screwdrivers, trim removal tool, needle-nose pliers, 100 socket, electrical tape

Applicable Models:

Mercedes-Benz W201 (1984-93)

Parts Required:

Window regulator

Hot Tip:

Door panels are expensive, take your time

Performance Gain:

Windows that work

Complementary Modification:

Replace switches.

This article will show you how to replace your rear window regulator. You will need to remove your door panel to get access to the regulator.

Before you begin removing the door panel, you should park the car on as level ground as possible. Nothing is more frustrating than working on the door while it is swinging. It is also a good idea to get yourself a small box or container to keep all your parts organized. Roll the window down so there is only approximately one inch of glass above the door frame, turn off the ignition and remove the key from the lock.

First remove the plastic lock along the upper ledge. It unscrews counter clock wise. The door panel is only held on by two (2) attached pieces of hardware. The first is the door lock trim piece. Remove this piece by unscrewing the Phillips screw and pulling the trim piece straight back.

Second is the door pull handle. Using your trim removal tool, remove the trim piece at the top of the pull handle. Underneath you will see a 10mm nut, remove this. Now you can slide the housing for the interior door handle forward and out of the panel. Once it is forward you can remove the actuator rod that connects the handle to the lock assembly behind it.

Now using your trim tool you need to remove the window switch. Pry the switch from the door panel and disconnect the wiring harness from the switch.

You have now removed everything that is bolted to the door panel. Mercedes-Benz door panels are different from most other manufacturers in that they do not use compressible clips to hold the panel to the door. These panels are held on to the door by hard plastic hooks that sit within pockets in the sheet metal of the inner door. Once you have all the hardware off the door, you simple need to lift the panel up and away from the door. The rear doors have two metal clips that help hold the panel to the upper rail of the door. These can take a little pressure to get them to release from the door, make sure you don't break the panel while remove these.

With the door panel removed you will see what is referred to as a "vapor barrier" between the panel and the door. It is really just a piece of plastic held on by glue, and is used to keep out any wind, weather or noise from entering the vehicle. If you are going to be doing further work on your door, carefully, and I mean carefully, try and remove it in one piece so you can reuse it when putting the door back together. If you damage it, you can get some thin plastic sheeting from your hardware store and recover the door with it.

You will need to remove the green and black wires for the motor from the switch, so you can pass them through the door. One way is to take the switch a part, clip the wires and then re-solder a new female connector on. An easier way is to cut the two wires before the switch and then connect the new harness there. Just make sure to use a vacuum wrap connector or something that is permanent, you don't want a short and have to take the door apart again to fix it.

With the switch out of the way, wedge or tape the window in position. Reach into the door and remove the locking clamp from the guide member. Just use a small screwdriver to pry it out.

Next unscrew the four 10mm nuts holding the window regulator to the door. Push the assembly back into the door until it clears the mounting screws, you will have to lift upwards a half inch as the top of the assembly sits in a tab in the upper part of the door. Slide the guide member out towards the rear of the door, and remove the regulator out through the assembly opening.

Installation is the reverse of removal.

Shown here is the interior door panel.
Figure 1

Shown here is the interior door panel. You will need to remove the door lock pull (blue arrow) lock trim piece (green arrow), the trim piece by the door pull (red arrow) and window switches (red arrows). The purple arrows show where the retainer clips are located under the panel.

After unscrewing the door lock pull, remove the lock trim piece by removing the Phillips screw and pulling the trim piece straight back (red arrow).
Figure 2

After unscrewing the door lock pull, remove the lock trim piece by removing the Phillips screw and pulling the trim piece straight back (red arrow).

Remove the door pull handle trim piece with your trim tool.
Figure 3

Remove the door pull handle trim piece with your trim tool.

Unbolt the 10mm nut behind the trim piece.
Figure 4

Unbolt the 10mm nut behind the trim piece. Once this is removed you can slide the complete handle piece forward and out of the door.

Here is the handle assembly out of the door.
Figure 5

Here is the handle assembly out of the door. You can see the lock actuating rod still mounted to the door (green arrow) and where it mounts in to the assembly (yellow arrow).

Here is the interior of the door panel.
Figure 6

Here is the interior of the door panel. You can see the five hooks that hold it to the door (yellow arrows). Insert lower right shows the plastic hooks.

Shown here is the window switch taken apart.
Figure 7

Shown here is the window switch taken apart. You need to free up the green and black wires going from the switch to the motor. One way is to open the switch and cut the wires at the joiners and then re-assemble them by crimping in new female joiners, or an easier way is to cut the wires coming out of the switch (red arrows) and then join the new wires at the cut. If you go this route make sure you use a proper joiner as you do not want a short.

This is the window regulator in the lower position ready to be removed.
Figure 8

This is the window regulator in the lower position ready to be removed. First you want to undo the locking clamp from the guide member (red arrows), then unscrew the four bolts holding the assembly to the door.

With the bolts undone, lift the unit into up and into the door enough to clear the mounting bolts and slip the top part of the assembly out of its tab.
Figure 9

With the bolts undone, lift the unit into up and into the door enough to clear the mounting bolts and slip the top part of the assembly out of its tab. While doing this slide the guide out towards the rear of the door and then remove the assembly from the lower access hole.

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Comments and Suggestions:
Joseamilcar Comments: Be better if you guys use videos for tutoring
May 10, 2016
  Followup from the Pelican Staff: Thanks. I love video also. It is an ongoing discussion. - Nick at Pelican Parts  
rakrith Comments: excellent very illustrative perfect demo
December 16, 2014
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 
James Comments: Is it possible to replace the guide member only for M-B '93 model 190E 2.3L rear right window regulator? If so, how do I check if the motor/cable pully works properly before assembling everything back?
October 19, 2014
  Followup from the Pelican Staff: I don't believe so. The unit has to be replaced as one. - Nick at Pelican Parts  
jason Comments: Working on a 93 190E. Looking for drivers side rear window part. In figure 8 above it is the white plastic piece that rides on the vertical metal guide. It is located to the left of the farthest red arrow to the right
July 19, 2014
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
Sammy Comments: Hallow so far I never get any help yet. I need help I want to change my rear speakers but I'm not able to remove the back cover it look simple but I don't have idea pls help.
January 11, 2014
  Followup from the Pelican Staff: You have to remove the entire trim panel, not just the speaker covers. I would grab a repair manual, it will list all the steps involved. - Nick at Pelican Parts  
dave Comments: I personally converted my 1997 Mercedes benz 200E from manual windows to power window, but the challenge am having is how do i connect the center consoleback switches to function with the private back switches on the door-mats? All am trying to say in essence is How do i connect two switches and make it work on one motor? Please explain with the use of a diagram. Thanks.
September 8, 2013
  Followup from the Pelican Staff: Your are goig to have to change the switches for the rear windows. Normally Mercedes Benz (before door modules) would run the power and ground supply of the rear window motors through the rear switches and your original swi1tches are not wired like that. - Kerry at Pelican Parts  

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