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Sunroof Motor and Relay Replacement
 
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Pelican Technical Article:

Sunroof Motor and Relay Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$12 to $1,600

Talent:

****

Tools:

17mm, 10mm, 8mm, 6mm wrench

Applicable Models:

Mercedes-Benz W124 (1986-95)

Hot Tip:

Be patient

Performance Gain:

Working sunroof

Complementary Modification:

Clean the glass

If your sunroof motor stops working the first thing to check after the fuses is the relay. If the relay is good you will need to replace the motor. This is not an easy job to do in the Estate Wagon as there is very little room to work and the gears and cable will be covered in grease. Take your time, have lots of rags and you will get through it.

In the wagon the sunroof motor and relay are located under the panel that covers the spare tire on the left side.
Figure 1

In the wagon the sunroof motor and relay are located under the panel that covers the spare tire on the left side. Open the latch and fold the panel out of the way (red arrow).

Pry off the cover on the back side of the gearing (red arrow).
Figure 2

Pry off the cover on the back side of the gearing (red arrow).

Hold the center of the gearing with a 6mm wrench (red arrow and unscrew the 17mm nut (yellow arrow).
Figure 3

Hold the center of the gearing with a 6mm wrench (red arrow and unscrew the 17mm nut (yellow arrow).

Unplug the wiring connection (red arrow).
Figure 4

Unplug the wiring connection (red arrow). It just pulls straight out from the motor (red arrow).

Remove the two 10mm bolts holding the motor mount to the interior of the vehicle (red arrows).
Figure 5

Remove the two 10mm bolts holding the motor mount to the interior of the vehicle (red arrows).

Reach in behind and unclip and remove the plastic cover (red arrow).
Figure 6

Reach in behind and unclip and remove the plastic cover (red arrow).

Turn the assembly until you can get access to the front of the motor.
Figure 7

Turn the assembly until you can get access to the front of the motor. Use a 8mm wrench and remove the three bolts holding the motor plate on (red arrows).

The cable is below the gears, which will be covered in grease (red arrow).
Figure 8

The cable is below the gears, which will be covered in grease (red arrow). Slide the gears out so that you can get access to the cable.

There is a clip you will have to remove that holds the cable to the gears.
Figure 9

There is a clip you will have to remove that holds the cable to the gears. You will need to remove this and then pull the cable from the motor. Installation is the reverse of removal.

The relay is located in behind the plastic gears.
Figure 10

The relay is located in behind the plastic gears. You can reach in and pull it out from the back of the assembly (red arrow).

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Comments and Suggestions:
mohd fikry Comments: greetings,
do you ever had a chance to remove the sunroof and its parts ? if you had, do you have the manual posted anywhere?
i am having trouble with my sunroof where i can only hear the sound of the motor trying to do its job but sunroof just not moving.
thank you.
September 29, 2016
  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
 

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