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Replacing Your Front Window Regulator
 
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Pelican Technical Article:

Replacing Your Front Window Regulator

Steve Vernon

Time:

2 hours2 hrs

Tab:

$0

Talent:

**

Tools:

T20 Torx driver, drill and bits, trim removal tool

Applicable Models:

Mercedes-Benz W203 (2001-07)

Parts Required:

New Regulator

Hot Tip:

Get some spare window regulator clips

Performance Gain:

Windows that work

Complementary Modification:

Really clean the glass

If you are having troubles with your front door window regulators and they need to be replaced, this article will take you through the process step by step. To begin you will need to remove the door panel. Please see our article on removing your front door panel and complete the work there before starting this project. NOTE: make sure you lower the window until it is approximately 5 1/2 inches up from the lower molding.

If you have removed the door panel without lowering the window, now is the time to lower it so the top of the glass is approximately 5 1/2 inches up from the lower molding.

Unplug and remove the speaker from the door. It is held in place by three T20 Torx screws.

Next, you are going to be removing the airbag. If you have not already disconnected the battery and made sure the ground can not make accidental contact with the terminal you should do this before working on the air bag. Also make sure you wait half an hour between disconnecting the battery and working on any air bag system, this will give time for any residual energy in the system to discharge.

The air bag module is riveted to the door frame in three places. Use a drill bit slightly larger than the inside diameter of the rivet and drill them out. Make sure you use care as the window is directly behind the area you are working. Using too small of a bit and pushing too hard can lead to replacing the window along with the regulator. You are going to have to replace the rivets when you are reinstalling so you can either buy an inexpensive rivet gum or use small nuts and bolts. Just make sure you use some blue Loctite or Nylex bolts when reinstalling.

There is a small yellow electrical connector on the back of the air bag module that needs to be unplugged. Turn the air bag away from you and disconnect the plug. Always turn the airbag away from your body when disconnecting any air bag connections.

Drill out the four rivets for the door handle support and remove the support.

Carefully peel back the membrane from the door, leave the sticky stuff as you will need to reinstall this membrane later.

With the membrane removed you can see the six rivets holding the regulator to the door frame along with the two T20 Torxs holding the window to the regulator. Drill out the six rivets for the regulator. NOTE: on our project car someone had already drilled out two of the lower rivets and replaced them with bolts.

Carefully remove the two T20 Torx screws holding the glass to the regulator clips. Remove the screws which will allow you to remove the glass. No matter how carefully you remove the clips there is a good chance one of them will break so it is a good idea to order replacements before you start.

You can pull the glass up and tape it to the top of the door frame, but I find it easier to just remove it from the door and give it a good cleaning.

Remove the clip that holds the regulator cable.

The regulator sits in a slot. Lift it up and out to free it.

Turn the regulator sideways and lower it to the access hole in the door. Disconnect the wiring harness by squeezing the connection and pulling apart.

Carefully remove the regulator from the door through the lower cutout.

Installation is the reverse of removal. Don't forget to use some blue Loctite if you are reinstalling with nuts and bolts instead of rivets

If you have removed the door panel without lowering the window now is the time to lower it so the top of the glass is approximately 5 1/2 inches (red arrow) up from the lower molding.
Figure 1

If you have removed the door panel without lowering the window now is the time to lower it so the top of the glass is approximately 5 1/2 inches (red arrow) up from the lower molding.

Unplug and remove the speaker (red arrow) from the door.
Figure 2

Unplug and remove the speaker (red arrow) from the door. It is held in place by three T20 Torx screws. Next, you are going to be removing the airbag (yellow arrow). If you have not already disconnected the battery and made sure the ground can not make accidental contact with the terminal you should do this before working on the air bag. Also, make sure you wait half an hour between disconnecting the battery and working on any air bag system, this will give time for any residual energy in the system to discharge.

The air bag module is riveted to the door frame in three places (red arrows).
Figure 3

The air bag module is riveted to the door frame in three places (red arrows). Use a drill bit slightly larger than the inside diameter of the rivet and drill them out. Make sure you use care as the window is directly behind the area you are working. Using too small of a bit and pushing too hard can lead to replacing the window along with the regulator. You are going to have to replace the rivets when you are reinstalling so you can either buy an inexpensive rivet gum or use small nuts and bolts. Just make sure you use some blue Loctite or Nylex bolts when reinstalling.

There is a small yellow electrical connector on the back of the air bag module that needs to be unplugged (red arrows).
Figure 4

There is a small yellow electrical connector on the back of the air bag module that needs to be unplugged (red arrows). Turn the air bag away from you and disconnect the plug. Always turn the airbag away from your body when disconnecting any air bag connections.

Drill out the four rivets (red arrows) for the door handle support and remove the support.
Figure 5

Drill out the four rivets (red arrows) for the door handle support and remove the support.

Carefully peel back the membrane from the door, leave the sticky stuff (red arrow) as you will need to reinstall this membrane later.
Figure 6

Carefully peel back the membrane from the door, leave the sticky stuff (red arrow) as you will need to reinstall this membrane later.

With the membrane removed you can see the six rivets (red arrows) holding the regulator to the door frame along with the two T20 Torxs (yellow arrows) holding the window to the regulator.
Figure 7

With the membrane removed you can see the six rivets (red arrows) holding the regulator to the door frame along with the two T20 Torxs (yellow arrows) holding the window to the regulator. Drill out the six rivets for the regulator. NOTE: on our project car someone had already drilled out two of the lower rivets and replaced them with bolts.

Carefully remove the two T20 Torx screws (red arrow) holding the glass to the regulator clips.
Figure 8

Carefully remove the two T20 Torx screws (red arrow) holding the glass to the regulator clips. Remove the screws which will allow you to remove the glass.

No matter how carefully you remove the clips there is a good chance one of them will break (red arrow) so it is a good idea to order replacements before you start.
Figure 9

No matter how carefully you remove the clips there is a good chance one of them will break (red arrow) so it is a good idea to order replacements before you start.

You can pull the glass up (red arrows) and tape it to the top of the door frame, but I find it easier to just remove it from the door and give it a good cleaning.
Figure 10

You can pull the glass up (red arrows) and tape it to the top of the door frame, but I find it easier to just remove it from the door and give it a good cleaning.

Remove the clip that holds the regulator cable (red arrows).
Figure 11

Remove the clip that holds the regulator cable (red arrows).

The regulator sits in a slot (red arrow).
Figure 12

The regulator sits in a slot (red arrow). Lift it up and out to free it.

Turn the regulator sideways and lower it to the access hole in the door.
Figure 13

Turn the regulator sideways and lower it to the access hole in the door. Disconnect the wiring harness by squeezing the connection (red arrows) and pulling apart.

Carefully remove the regulator from the door through the lower cutout.
Figure 14

Carefully remove the regulator from the door through the lower cutout.

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Comments and Suggestions:
John Comments: I just installed a window regulator on my 2006 C230 Mercedes, window works fine except know my driver door lock will not lock with my remote. I can manually lock it with my key and it will unlock with the remote. Can you Help?
June 29, 2016
  Followup from the Pelican Staff: You probably left something unplugged. Recheck your work. - Nick at Pelican Parts  
Bhavan Comments: Thanks, followed your instructions to the letter, regulator is out. Now to get a new one and fit. Will advise on progress - time essential.
March 13, 2016
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
was elnour Comments: rhanks for such usefull information, can you please show me how
can I install new regulator after i removed the pld one??
March 4, 2016
  Followup from the Pelican Staff: You didn't mention what vehicle. If it for the model you commented on, follow the steps here:

http://www.pelicanparts.com/techarticles/Mercedes-W203/BODY-Replacing_Your_Front_Window_Regulator/BODY-Replacing_Your_Front_Window_Regulator.htm - Nick at Pelican Parts
 
vuyani Comments: Hi
Have a problem with my drivers side r ight window on a c180 kpmpressor 2006 .window not going up or down just dead.please give an advice as how to fix it.your assistance will be most appreciated

Best regards
Vuuaniuy
January 16, 2016
  Followup from the Pelican Staff: Sounds like a faulty window regulator. I would inspect it and replace if needed. - Nick at Pelican Parts  
aggreythuo Comments: Thanks. Is there a repair for a broken regulator cable for Wd 2003?
June 12, 2015
  Followup from the Pelican Staff: Wd?

We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Tommy Comments: Great article, thx! Managed to replace my broken mechanism. One question: After disconnecting the airbag, I got an SRS warning, which I figured would disappear again once reconnected. Unfortunately, this was of the case & the SRS warning remains after job completion. Any idea how to clear it without hooking up the PC?
June 1, 2015
  Followup from the Pelican Staff: The only way to clear and airbag warning light is with a scan tool. - Nick at Pelican Parts  
Austin Comments: My 2000 ML320 has the gear driven window regulator. Are the steps shown here fairly accurate for replacing this type of regulator minus rivet/T20 torx screw placement?
September 19, 2014
  Followup from the Pelican Staff: No. This article applies to:
Mercedes-Benz W203 (2001-07) - Nick at Pelican Parts
 
Les Comments: Thanks for this very informative instruction. Is this regulator the same one used in the 2005 ML350 front driver-side?
Thanks
August 3, 2014
  Followup from the Pelican Staff: No.

This article applies to:
C320 (1998-2004)
E320 (1998-2004)
S320 (1998-2005)
ML320 (1998-2003)
CLK320 (1998-2004)
SLK320 (1998-2003) - Nick at Pelican Parts
 
Jon Comments: Many thanks from across the pond, any chance of printer friendly option for the instructions?
June 1, 2014
  Followup from the Pelican Staff: Thanks for the feedback. Other than printing the web page, no. - Nick at Pelican Parts  
ras Comments: Can you let me know where to order spare window regulator clips for my MB C230 please.
March 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
 
ras Comments: Can you give me a place to order spare Window Regulator Clips please.
March 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
 
Dickson Comments: It is MY2001 C320 W203. The window is stuck at the fully closed position and now the window regulator is broken so how could I lower the window glass just enough that I can access the clip holding the glass to the regulator?
February 28, 2014
  Followup from the Pelican Staff: You can cut the window regulator cables. This will allow the glass to be moved and detach it from the regulator. - Nick at Pelican Parts  
Dickson Comments: The window is stuck at the fully closed position and now the window regulator is broken so how could I lower the window glass just enough that I can access the clip holding the glass to the regulator?
February 26, 2014
  Followup from the Pelican Staff: You didn't mention what type of vehicle you have. You can either detach the window from the regulator or cut the regulator cables to free the window from it. - Nick at Pelican Parts  
gustavo Comments: I would like to know how i can replace my rear window regulator step by step or pics on my 2004 clk320. I've done it on my c240 but this one is different. thks
December 1, 2013
  Followup from the Pelican Staff: I would grab a repair manual. It will have the procedure, special tools and torque specs.
- Nick at Pelican Parts
 
Brian Comments: hi, thanks so much for the writeup! Very helpfull!. I can't see to figure out how to replace the top door handle and air bag rivets as there is no way to get behind them, at least on my car. 2005 C230 sports sedan, w203. Any tips on that?
November 30, 2013
  Followup from the Pelican Staff: Do you mean install new rivets? They install from the door panel side of the door.- Nick at Pelican Parts  
jay Comments: excellent how to and parts availability
July 17, 2013
  Followup from the Pelican Staff: Glad you found this diy helpful.
-whunter-
 

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