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Front Door Window Motor Replacement
 
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Pelican Technical Article:

Front Door Window Motor Replacement

Steve Vernon

Time:

3 hours3 hrs

Tab:

$200

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:

Reset motor normalization after installation

Performance Gain:

Working windows

Complementary Modification:

Check door panel lights and switches

If your front windows have 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.

When removing the door panel begin by placing the window in the lowest position it will go (green arrow).
Figure 1

When removing the door panel begin by placing the window in the lowest position it will go (green arrow). There are two trim pieces you will need to move/remove before removing the panel. One is the window trim piece where it meets the door panel (red arrow), and the other is the triangular speaker cover by the A-pillar (yellow arrow).

There is a fastener under the window trim piece that you will need access to.
Figure 2

There is a fastener under the window trim piece that you will need access to. Use a trim removal tool and separate the trim piece from the weather stripping on the outside of the doorframe (red arrow).

With the trim piece out of the weather strip channel use your trim tool and separate the piece (red arrow) from the doorframe.
Figure 3

With the trim piece out of the weather strip channel use your trim tool and separate the piece (red arrow) from the doorframe. You can now access the fastener (yellow arrow). This fastener has varied over the years from a clip to a T30 Torx screw.

Next, remove the triangular cover by prying it out from the area around the mirror.
Figure 4

Next, remove the triangular cover by prying it out from the area around the mirror. If yours has been removed before you can probably do this with your hands. If not use your trim removal tool (red arrow).

With the section around the mirror loose push the piece forward (red arrow) and out from the door.
Figure 5

With the section around the mirror loose push the piece forward (red arrow) and out from the door. The piece can just hang by the small speaker wire, or you can disconnect it.

Use a T30 Torx and remove the three T30 Torx bolts.
Figure 6

Use a T30 Torx and remove the three T30 Torx bolts. One is under the trim piece you removed, and two are below the armrest (red arrows).

There are nine clips (red arrow) that hold the door panel in place.
Figure 7

There are nine 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 panel. You want to 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. 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.

This photo shows the approximate location of the clips and where you want to insert the tool.
Figure 8

This photo shows the approximate location of the clips and where you want to insert the tool. Make sure the tool is seated around the clip before prying on it.

With all the clips free you want to lift the panel up and out from the channel on the top of the door (red arrow).
Figure 9

With all the clips free you want to lift the panel up and out from the channel on the top of the door (red arrow). The door lock pull will stay on the door so you will have to lift the panel over it.

Tilt the panel towards yourself and slide the door pull cable Red arrow) out from the support in the door panel (yellow arrow).
Figure 10

Tilt the panel towards yourself and slide the door pull cable Red arrow) out from the support in the door panel (yellow arrow). Unhook the Bowden cable from the handle (green arrow).

The panel will still be connected to the door by the electrical connections; on our vehicle we unplugged the two connections by pressing in the tabs and separating them (red arrows).
Figure 11

The panel will still be connected to the door by the electrical connections; on our vehicle we unplugged the two connections by pressing in the tabs and separating them (red arrows).

The door panel is not free and can be safely removed.
Figure 12

The door panel is not free and can be safely removed. If you are lying it down to work on it make sure to put something down first to avoid damaging the interior trim. This photo shows the location of the clips (yellow arrows). You can see how two of them (red arrows) stayed in the doorframe when we removed the panel.

If the clips have not broken you can just pry them out of the door and reinsert them into the panel.
Figure 13

If the clips have not broken you can just pry them out of the door and reinsert them into the panel. It is a good idea to order a few spare clips before you begin in case you damage a few. This way you will not be hung up upon reassembly waiting for clips.

You now have access to the door component carrier.
Figure 14

You now have access to the door component carrier. The window motor is mounted to the door carrier (red arrow).

Begin by pressing in the tab on the bottom of the wiring connection (red arrow) and separating the connection from the motor.
Figure 15

Begin by pressing in the tab on the bottom of the wiring connection (red arrow) and separating the connection from the motor.

Next, use a T25 Torx and remove the three screws that hold the motor (red arrows) to the door component carrier.
Figure 16

Next, use a T25 Torx and remove the three screws that hold the motor (red arrows) to the door component carrier.

Wiggle and pull the motor off of the carrier.
Figure 17

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.

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