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Front Window Regulator Replacement on your Mercedes Benz
 
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Pelican Technical Article:

Front Window Regulator Replacement on your Mercedes Benz

Steve Vernon

Time:

2 hours2 hrs

Tab:

$345

Talent:

***

Tools:

Phillips screwdriver, trim removal tool, 8mm, 10mm socket

Applicable Models:

Mercedes-Benz W201 (1984-93)

Parts Required:

New Regulator

Hot Tip:

Door panels are expensive, take your time

Performance Gain:

Dry interior when raining

Complementary Modification:

Replace switches

This article will show you how to replace your front window regulator. To get to the window regulator you will need to remove the door panel and while it is not a difficult job, but the door panels can be very expensive so take your time and double check things. Also, if you are going to be working on your own car, it is a good idea to purchase a set of trim removal tools. They are a set of hard yet flexible plastic tools of different shapes and sizes that are used in removing trim pieces.. They work a lot better than a flat-head screwdriver and there is nothing worse than ruining a "do-it-yourself" project by scratching up your car or damaging expensive interior pieces. Pelican sells a full line of these tool sets for under $20. While we are talking tools, I personally use Kevlar sleeves when working inside the door panels as there are lots of sharp pieces of metal you can easily cut yourself on and the sleeves offer great protection.

Before you begin removing the door panel you should park the car on as level ground as possible. Nothing is more frustrating that trying to work on the door while it is swinging open or closed. It is also a good idea to get yourself a small box or container to keep all your parts in.

First remove the plastic lock along the upper ledge. It just unscrews counter clockwise. 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. Begin by removing the set of control switches for the power seat. Using your trim removal tool, gently pry off each piece. The seat switch rides on a small cylindrical post that has a circlip attached to it. Remove this clip using your needle-nose pliers. Once the clip is off you can use you trim tool to remove the cover plate for the seat switches. Unscrew the screws holding the switches to the door and pull them out from the door.

Next using your trim removal tool, remove the trim piece at the top of the pull handle. Underneath, remove the 10mm nut. 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.

You have now removed everything that is bolted to the door panel. The 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. Mercedes-Benz 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.

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 the door getting into the interior of the car. 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.

Once the plastic is removed, lower the window until you can see the upper rail through the upper access hole. Wedge or tape the window in place in this position. With the window secure, turn off the power and remove the key. Disconnect the wiring for the motor by unscrewing the two Phillips-head screws and passing the green and black wire into the body of the door.

Next you will loosen the three 10mm nuts holding the assembly to the door, the 10mm nut holding the upper bracket to rail, and the two 10mm nuts holding the lower rail guide. Remove the lower rail guide by sliding towards the front of the door. Remove the motor and assembly from its mounting holes and slide it towards the bottom of the door. While doing this slide the upper guide forward and down through the opening on the rail.

Remove the complete assembly from the door.

To reassemble, you will need to feed the regulator into the door. Once in the door, slide the upper guide element into the upper rail and towards the back of the door. Place the threaded bolts for the motor into their holes and tighten. Reattach the forward guide and tighten the 10mm bolt. Insert the lower guide rail from the front and seat the lower arm. Tighten everything up. Be sure to check for function before putting the door panel back on.

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 (green arrow) lock trim piece (blue arrow), and the trim pieces by the door pull and seat switches (red arrows).

Begin by unscrewing the door lock pull.
Figure 2

Begin by unscrewing the door lock pull. It unscrews counter clockwise.

Next remove the lock trim piece by unscrewing the Phillips screw and pulling the trim piece straight back.
Figure 3

Next remove the lock trim piece by unscrewing the Phillips screw and pulling the trim piece straight back.

Using your trim tool remove the plastic pieces for the seat controls.
Figure 4

Using your trim tool remove the plastic pieces for the seat controls.

You will need to remove this small circlip (red arrow) before you can remove the trim face.
Figure 5

You will need to remove this small circlip (red arrow) before you can remove the trim face. Once the circlip is off, pull off the face plate.

Remove the door pull handle trim piece and unscrew the 10mm nut behind it.
Figure 6

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

Once the handle unit has been pulled forward reach in and remove the actuator rod from the handle (red arrow).
Figure 7

Once the handle unit has been pulled forward reach in and remove the actuator rod from the handle (red arrow).

Here is the interior of the door panel.
Figure 8

Here is the interior of the door panel. You can see the 6 hooks that hold it to the door (green arrows). Insert upper right shows the plastic hooks.

Before you can remove the vapor shield (plastic along the door) you will need to remove the door speakers.
Figure 9

Before you can remove the vapor shield (plastic along the door) you will need to remove the door speakers. These are held in place by four 8mm nuts (red arrows).

Lower the window until you can see the upper regulator bolt through the access hole (red arrow).
Figure 10

Lower the window until you can see the upper regulator bolt through the access hole (red arrow). Once the window is in the right position, turn off the power and remove the key, disconnect the switch and place a wedge between the window and seal to keep it in place (insert lower left).

Next, remove the two Phillips screws holding the wires for the power window motor (red arrows).
Figure 11

Next, remove the two Phillips screws holding the wires for the power window motor (red arrows). Pass the loose green and black wire into the door body.

This picture shows everything you will to have access to to remove the window regulator from the door.
Figure 12

This picture shows everything you will to have access to to remove the window regulator from the door. The window is in the proper position so you can get access to the upper rail (green arrows). Now remove the three 10mm nuts holding the assembly on (red arrows), then remove the two 10mm nuts holding on the lower rail (yellow arrows). You can see the window motor here (blue arrow).

Slide the lower rail from the regulator in a forward direction.
Figure 13

Slide the lower rail from the regulator in a forward direction.

Remove the 10mm nut holding the regulator to the upper rail (insert lower left, yellow arrow), then lower the motor and assembly towards the bottom of the door while sliding the upper arm (red arrow) towards the front of the car and out through the cut out in the rail (green arrow).
Figure 14

Remove the 10mm nut holding the regulator to the upper rail (insert lower left, yellow arrow), then lower the motor and assembly towards the bottom of the door while sliding the upper arm (red arrow) towards the front of the car and out through the cut out in the rail (green arrow).

This is what the window regulator assembly and motor look like removed from the access hole in the door.
Figure 15

This is what the window regulator assembly and motor look like removed from the access hole in the door.

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Comments and Suggestions:
Mertsi1340 Comments: Hi,
Could you please add the red arrow mentioned in the text for Figure 10.
Thanks for the great article by the way.
June 26, 2014
  Followup from the Pelican Staff: Thanks for catching that. I will have the arrow added. - Nick at Pelican Parts  

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