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Replacing Your Power Window And Trunk Release Module
 
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Pelican Technical Article:

Replacing Your Power Window And Trunk Release Module

Steve Vernon

Time:

20 min

Tab:

$0

Tools:

T20, T27 Torx, trim removal tool

Applicable Models:

Mercedes-Benz W203 (2001-07)

Parts Required:

Power Window Module

Hot Tip:

Get some spare door clips

Performance Gain:

Doors that work

Complementary Modification:

Replace switches

This article will show you how to replace your power window and trunk opening module on the driver side door. It is not a difficult job, but door panel will have to come off and they 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.

Before you begin removing the door panel, you need to disconnect the battery and let the car sit for half an hour. You are going to be working around the air bag and you want to make sure there is no electricity flowing in the car and that there has been time for the residual power to drain. You should also park the car on as level ground as possible. Nothing is more frustrating than working on the door while it is trying to swing open or closed.

First remove the plastic lock along the upper ledge. It unscrews counter clock wise. The door panel is only held on by three attached pieces of hardware. The first is the door lock trim piece. Remove this piece by unscrewing the single T20 Torx head screw and pulling the trim piece straight back.

Second is the door pull handle. Use your trim removal tool and gently pry the cover off the pull handle. With the handle off use your T27 Torx and remove the 2 screws inside the handle securing it to the door.

Next using your trim removal tool, remove the trim SRS trim piece located on the panel below the lock. Use a T20 Torx and remove the screw behind this piece.

There is a small footwell light under the map pocket that you can gently pry out with your trim removal tool and then disconnect the wires.

You will need to remove the small triangular shaped piece at the top front of the door that holds the speaker. Insert your trim removal tool at the top by the glass and pop it out. It will slide forward as you remove it. Disconnect the wires from the speaker.

There are seven clips that hold the panel to the sides and bottom of the door. Use your trim removal tool and gently pry the panel away from the door. If your door panel has never been removed it may take a little force.

Moving to the top of the panel gently insert your trim tool and pry the door panel up and away from the door.

With the panel off you need to remove the pull cable for the handle. Slip the metal end of the cable from the handle then gently extend the cable and slip it out of the channel.

Unplug the wiring for the seat controls.

The module for the window controls and trunk opening sit in a four slotted bracket. Slide the white top of the unit back; this will release it from the bracket. Pull it up and back out of the bracket. It can be a very tight fit so take your time as the bracket it sits in is not easily replaceable.

Unplug the unit from the main panel located behind the membrane on the door.

You will need to re-synchronize the window to get the auto open/close function to work. You do this by moving the window to the top blocked position and continuing to hold the switch in the up position. Once the motor detects a motor lock up for >3 seconds it resets the system.

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 (purple arrow) SRS trim piece (yellow arrow), the door pull trim piece (red arrow) and the footwell light (blue arrow, not shown). NOTE: a passenger side door is shown but the same procedures are used on the driver side.

Begin by removing the door lock pull.
Figure 2

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

Use your trim removal tool and gently pry the cover of the pull handle (yellow arrow).
Figure 3

Use your trim removal tool and gently pry the cover of the pull handle (yellow arrow).

With the handle off use your T27 Torx and remove the 2 screws inside the handle (yellow arrows) securing it to the door.
Figure 4

With the handle off use your T27 Torx and remove the 2 screws inside the handle (yellow arrows) securing it to the door.

Next using your trim removal tool, remove the trim SRS trim piece located on the panel below the lock.
Figure 5

Next using your trim removal tool, remove the trim SRS trim piece located on the panel below the lock. Use a T20 Torx and remove the screw behind this piece.

There is a small footwell light under the map pocket that you can gently pry out with your trim removal tool and then disconnect the wires (yellow arrow).
Figure 6

There is a small footwell light under the map pocket that you can gently pry out with your trim removal tool and then disconnect the wires (yellow arrow).

You will need to remove the small triangular shaped piece at the top front of the door that holds the speaker.
Figure 7

You will need to remove the small triangular shaped piece at the top front of the door that holds the speaker. Insert your trim removal tool at the top by the glass and pop it out. It will slide forward as you remove it. Disconnect the wires from the speaker (yellow arrow).

There are seven clips that hold the panel to the sides and bottom of the door.
Figure 8

There are seven clips that hold the panel to the sides and bottom of the door. Use your trim removal tool and gently pry the panel away from the door (yellow arrow). If your door panel has never been removed it may take a little force.

Moving to the top of the panel gently insert your trim tool and pry the door panel up and away from the door (yellow arrow).
Figure 9

Moving to the top of the panel gently insert your trim tool and pry the door panel up and away from the door (yellow arrow).

With the panel off you need to remove the pull cable for the handle.
Figure 10

With the panel off you need to remove the pull cable for the handle. Slip the metal end of the cable from the handle (yellow arrow) then gently extend the cable and slip it out of the channel (red arrow).

Unplug the wiring for the seat controls (yellow arrow).
Figure 11

Unplug the wiring for the seat controls (yellow arrow).

This photo illustrates the seven clips that secure the panel to the bottom and sides of the door (red arrows) and the location of the window control module (green arrow).
Figure 12

This photo illustrates the seven clips that secure the panel to the bottom and sides of the door (red arrows) and the location of the window control module (green arrow).

The module for the window controls and trunk opening sit in a four slotted bracket.
Figure 13

The module for the window controls and trunk opening sit in a four slotted bracket. Slide the white top of the unit back (yellow arrows), this will release it its holding slots in the bracket (red arrows). Pull it up and back out of the bracket. It can be a very tight fit so take your time as the bracket it sits in is not easily replaceable.

Unplug the unit from the main panel (red arrow) located behind the membrane on the door.
Figure 14

Unplug the unit from the main panel (red arrow) located behind the membrane on the door.

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Comments and Suggestions:
cb Comments: the comment from evan was not addressed. Will there be any impact on the computer system in the car as a result of disconnecting the battery.
October 7, 2016
  Followup from the Pelican Staff: It was addressed, I stated it was a good idea. If it were not and would cause issues, I would have told Evan not to disconnect it. - Nick at Pelican Parts  
Memphis Comments: Thanks this helped a lot!
September 13, 2016
  Followup from the Pelican Staff: No problem. - Nick at Pelican Parts  
joy Comments: mercedes c230 kompressor...smart key suddenly stopped opening trunk lid...green button on inside of trunk lid still opens the trunk...there is no keyhole for slim key to open trunk from the outside...model 2003...what is wrong?
April 6, 2016
  Followup from the Pelican Staff: Could be the module that activates the solenoid. i would monitor the signal from the key to the module, then the output to the solenoid. - Nick at Pelican Parts  
alpha Comments: I can have a full video how to replace the window controller for Mercedes c220 cdi year 2003 please
September 1, 2015
  Followup from the Pelican Staff:
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
 
Jack Comments: I have a 1999 e320. Every few days the electric front window and front seat adjustment quits working on either the left or right side. Then both quit working..I disconnect the battery cables, touch them together with the switch off and everything starts working again. I assume I reboot a module somehow. Which part do I need to replace? Thanks
November 28, 2014
  Followup from the Pelican Staff: Could be a faulty seat or body module - front electronic module. I would start by checking the vehicle for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing.
- Nick at Pelican Parts
 
Bry Comments: This appears to be referring to the switch replacement and not the door control module as you indicate.
October 7, 2014
  Followup from the Pelican Staff: Thanks for the catching that. We appreciate it. I will have the article updated.
- Nick at Pelican Parts
 
Evan Comments: Hi, I'm green to diy repair. May i ask how to disconnect battery before removing the panel? Somebody told me that doing so may cause the computer being locke and have to go for official checkup, is that true? My car is C320 w203. Thanks
July 18, 2014
  Followup from the Pelican Staff: Disconnecting the battery is a good idea. This way the window can't activate while you are working on it. - Nick at Pelican Parts  

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