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Rear Window Motor Replacement
 
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Pelican Technical Article:

Rear Window Motor Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$325

Talent:

**

Tools:

Trim removal tool, T30, T25 Torx driver

Applicable Models:

Mercedes-Benz C250 (2012-14)
Mercedes-Benz C300 (2008-14)
Mercedes-Benz C350 (2008-14)

Parts Required:

Window motor

Hot Tip:

Pry as close to the clips as possible

Performance Gain:

Working windows

Complementary Modification:

Detail the interior

If your rear window has stopped working all together there is a good chance it is the motor. If the window is making a grinding sound while you are raising or lowering it is probably the regulator. Due to the design of the motor and regulator on the C350 replacing the motor is easy once you get the door panel off.

This article will show you how to remove your rear window motors. It is not a difficult job, but the window motors are expensive, as are the door panels. 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 much better than a flathead 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.

Begin by using a T30 Torx and removing the two T30 Torx bolts under the armrest (red arrows).
Figure 1

Begin by using a T30 Torx and removing the two T30 Torx bolts under the armrest (red arrows).

There are eight clips (red arrow) that hold the door panel in place.
Figure 2

There are eight clips (red arrow) that hold the door panel in place.

Some of these clips might break or stay in the door when you are removing the door panel.
Figure 3

Some of these clips might break or stay in the door when you are removing the door panel. You should use the proper door panel trim removal tool and get as close to the clips as possible. Prying them out will take a surprising amount of force, and you want to avoid having the plastic section of the panel that holds the clips break. Also, do not pull on the panel with your hands, as you risk bending or damaging the panel itself.

Lift the door panel up and out of the window channel starting at the rear and working your way forward.
Figure 4

Lift the door panel up and out of the window channel starting at the rear and working your way forward. With the panel off reach in and squeeze the two clips on the Bowden cable together and release the cable from the mount, and slide it out of the opening in the panel (yellow arrow).

Remove the door pull cable from the panel by pulling it back and slipping it out from the cable mount (red arrow) and then lifting it up out of the handle (yellow arrow).
Figure 5

Remove the door pull cable from the panel by pulling it back and slipping it out from the cable mount (red arrow) and then lifting it up out of the handle (yellow arrow).

Unplug the electrical connections from the control unit (red arrow).
Figure 6

Unplug the electrical connections from the control unit (red arrow).

The motor is located in the middle of the door (red arrow) and is held in place by three T25 Torx screws.
Figure 7

The motor is located in the middle of the door (red arrow) and is held in place by three T25 Torx screws.

Release the electrical connection by pressing in on the tab on the bottom (red arrow) and then separating it from the motor.
Figure 8

Release the electrical connection by pressing in on the tab on the bottom (red arrow) and then separating it from the motor.

Use a T25 Torx and remove the three screws holding the motor in place (red arrows).
Figure 9

Use a T25 Torx and remove the three screws holding the motor in place (red arrows).

Wiggle and pull the motor off of the carrier.
Figure 10

Wiggle and pull the motor off of the carrier. The splines on the motor (red arrow) will line up and sit inside the gearing on the regulator (yellow arrow) when installing the new motor. The motor works off of a Hal sensor signal to determine when it is fully open and closed so do not forget to reset the normalization of the window after installing. Installation of the rest of the components is the reverse of removal.

Check the door panel before reinstalling it to make sure all the clips are in the panel and not in the door.
Figure 11

Check the door panel before reinstalling it to make sure all the clips are in the panel and not in the door. This photo shows the location of the clips.

If a clip remains in the door simply remove it and reinstall it along with the rubber isolator (red arrow) back into the mount in the panel (yellow arrow).
Figure 12

If a clip remains in the door simply remove it and reinstall it along with the rubber isolator (red arrow) back into the mount in the panel (yellow arrow). Installation is the reverse of removal.


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