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Pelican Technical Article:

Power Window Removal

Kerry Jonsson

Time:

4 hours4 hrs

Tab:

$250

Talent:

***

Tools:

Plastic prying tool, Phillips head screwdriver, 10mm socket with ratchet and extension, rivet gun

Applicable Models:

Mercedes-Benz R129 (1990-02)

Parts Required:

Power window motor, power window regulator, window glass, rivets

Hot Tip:

Have battery charger on so you can keep the key on while removing glass

Performance Gain:

Proper functioning window motor

One of the most used accessories is the power window. Whether you are putting the top down, paying a toll or just letting the sun shine it your power window is sorely missed when it stops working. On the 500SL and the SL500 Mercedes Benz uses a scissor-type power window regulator to move the window up and down in the guide. The electric motor is attached to the regulator to power that movement. In this tech article we will show you all the steps necessary to replace your power window motor, power window regulator and window glass.

In order to remove your power window components you will need to remove the inner door panel. See our tech article on door panel removal for these instructions.

ThisPicture illustrates the right side door with the door panel already removed.
Figure 1

ThisPicture illustrates the right side door with the door panel already removed. The same procedure to remove the power window assembly applies to the left side door as well. Slowly start peeling away the moisture barrier from the door that is held on by black sealant.

Remove the three Phillips head fasteners (green arrows) and three 8mm fasteners (yellow arrows) that hold on the speaker enclosures.
Figure 2

Remove the three Phillips head fasteners (green arrows) and three 8mm fasteners (yellow arrows) that hold on the speaker enclosures.

Squeeze the speaker electrical connector and pull it away from the enclosure to unplug it.
Figure 3

Squeeze the speaker electrical connector and pull it away from the enclosure to unplug it.

Remove the four Phillips head fasteners that hold on the door air duct to the door frame.
Figure 4

Remove the four Phillips head fasteners that hold on the door air duct to the door frame.

Completely peel the moisture barrier from the door to expose the door frame.
Figure 5

Completely peel the moisture barrier from the door to expose the door frame.

Turn the ignition key on and lower the window until it is in this position a few inches up from all the way down.
Figure 6

Turn the ignition key on and lower the window until it is in this position a few inches up from all the way down. This will expose the fasteners we need to remove to get the assembly out.

ThisPicture illustrates the lower front of the door.
Figure 7

ThisPicture illustrates the lower front of the door. Remove the 10mm fastener that holds the front glass onto the slider.

Reach around the glass slider at the back of it and pull out this bracket that the fastener threaded into.
Figure 8

Reach around the glass slider at the back of it and pull out this bracket that the fastener threaded into.

Slide the glass slider off the rail and remove it completely.
Figure 9

Slide the glass slider off the rail and remove it completely.

Remove the other four 10mm fasteners that hold the window and slider onto the window regulator (green arrows).
Figure 10

Remove the other four 10mm fasteners that hold the window and slider onto the window regulator (green arrows).

From behind the slider at the rear of the door, reach around to the back and remove the bracket behind the slider that the fastener threads into.
Figure 11

From behind the slider at the rear of the door, reach around to the back and remove the bracket behind the slider that the fastener threads into.

Slide the slider away from the slide rail and remove it from the door.
Figure 12

Slide the slider away from the slide rail and remove it from the door.

At the bottom of the glass the center mounting fastener has a bracket on it.
Figure 13

At the bottom of the glass the center mounting fastener has a bracket on it. Don't forget to install this bracket during installation.

Lift the glass straight up out of the door to remove it.
Figure 14

Lift the glass straight up out of the door to remove it.

To remove the power window motor remove the three 10mm fasteners (green arrows).
Figure 15

To remove the power window motor remove the three 10mm fasteners (green arrows).

Remove the two Phillips head fasteners (green arrows) that mount the power and ground supply wires together with the harness junction.
Figure 16

Remove the two Phillips head fasteners (green arrows) that mount the power and ground supply wires together with the harness junction.

Reach in and pull out the power window motor from behind the window regulator and route the wiring through the hole in the door frame.
Figure 17

Reach in and pull out the power window motor from behind the window regulator and route the wiring through the hole in the door frame. Note the wire routing for when you install the power window motor.

ThisPicture illustrates the rear half of the door.
Figure 18

ThisPicture illustrates the rear half of the door. Remove the two 10mm fasteners (green arrows) that hold part of the window regulator to the door frame.

Drill out the three rivets (green arrows) that hold the window regulator to the door frame.
Figure 19

Drill out the three rivets (green arrows) that hold the window regulator to the door frame.

Lift up the window regulator to unhook the metal support tang from its hole in the door.
Figure 20

Lift up the window regulator to unhook the metal support tang from its hole in the door. This will allow the window regulator to move around in the door frame so you can get it out.

Collapse the window regulator and slide it out of the large opening at the lower rear of the door frame.
Figure 21

Collapse the window regulator and slide it out of the large opening at the lower rear of the door frame. Installation is the reverse of the removal steps. Position the regulator through the opening in the door frame and hook the regulator metal tang into the hole in the door to temporarily hold it in place. Install the three rivets and position the sliding bracket on the window regulator in place and tighten the two fasteners. Put back the power window motor and route the wiring through the hole in the door as you found it. Attach the electrical wiring to the harness connections at the front of the door. Put the window glass back in the door and position it to install the three fasteners at the bottom of the gold rail. Install the sliders and the brackets that go behind them with their fasteners. Turn the ignition key on and operate the window. Make sure it does not rub or catch on anything else inside the door. Position the moisture barrier and install the duct work and speaker enclosure. Fit the door panel as outlined in the tech article on door panel removal.

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Comments and Suggestions:
Gordon Comments: Most helpful writeup!! The driver's side window motor in my 500SL is not working. I got one from salvage, but it seems to be DOA - if I ground it and provide +12V to the up/down wire, it should turn??
THANKS!
October 13, 2016
  Followup from the Pelican Staff: Yes, power and ground to the motor terminal should run the motor. - Nick at Pelican Parts  
Maboza Ritchie Comments: Another great write up guys,thanks so much
August 21, 2016
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 

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Page last updated: Wed 12/7/2016 02:28:38 AM