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Rear Wiper Motor Replacement
 
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Pelican Technical Article:

Rear Wiper Motor Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$200

Talent:

**

Tools:

13mm, 10mm socket, trim removal tools

Applicable Models:

Mercedes-Benz 300TD (1979-85)

Parts Required:

Wiper motor

Hot Tip:

Be careful working around the glass

Performance Gain:

Working rear windshield wiper

Complementary Modification:

Lubricate the lock system

The design of the rear windshield wiper motor is such that water can get through the seal in the glass and eventually work its way down into the motor and assembly. This can sometimes lead to premature failure of the system. If you are replacing the motor you may want to replace the seal in the glass at the same time.

Over the years your car may have been serviced by multiple people including previous owners and this can lead to parts replaced with different size fasteners and hardware. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches. If something is different on your vehicle please let us know and share your info to help other users. If you have any questions or comments or even a different procedure you would like to share please leave it below and please leave your vehicle information.

The rear windshield wiper assembly is located under the rear hatch panel (red arrow).
Figure 1

The rear windshield wiper assembly is located under the rear hatch panel (red arrow). The trim and panel will need to be removed to access it. Please see our article on rear hatch panel removal for instructions.

Begin by removing the wiper arm and blade.
Figure 2

Begin by removing the wiper arm and blade. The mechanism for the arm comes through a rubber gasket in the rear window. These rear windows are really expensive so use care when working around them. Lift up the cover on the base of the arm and use a 13mm socket to remove the nut and washer on the arm.

Wiggle and pull the arm off of the mechanism.
Figure 3

Wiggle and pull the arm off of the mechanism. If the arm is really stuck you can use a wiper arm puller but, again be really careful working around the glass. With the arm off squeeze in the plastic surround and pull it off the mechanism.

Open the hatch, and with the panel removed you can see the motor and assembly.
Figure 4

Open the hatch, and with the panel removed you can see the motor and assembly. There are three 10mm bolts holding the assembly in place. Two of the bolts run through rubber isolators (red arrows) and one holds a bracket around the motor (yellow arrow).

If the mechanism only needs greasing you can unclip the cover and apply a small amount to both fulcrums (red arrows).
Figure 5

If the mechanism only needs greasing you can unclip the cover and apply a small amount to both fulcrums (red arrows).

To replace the motor use a 10mm socket and remove the single bolt holding the motor bracket in place and remove the bracket.
Figure 6

To replace the motor use a 10mm socket and remove the single bolt holding the motor bracket in place and remove the bracket.

Next remove the two 10mm bolts holding the motor to the door (red arrow).
Figure 7

Next remove the two 10mm bolts holding the motor to the door (red arrow). You are going to be pulling the motor through the rubber gasket in the window and if you are worried about it you can apply a little lubricant to the gasket (yellow arrow). This area is known to be the cause of leaks and now may be a really good time to replace this gasket.

Pull the motor out until it clears the glass.
Figure 8

Pull the motor out until it clears the glass.

Remove the cover on the electrical connection and separate the connections by pulling it straight out (red arrow).
Figure 9

Remove the cover on the electrical connection and separate the connections by pulling it straight out (red arrow).

You can now remove the motor and assembly from the vehicle.
Figure 10

You can now remove the motor and assembly from the vehicle. Installation is the reverse of removal.

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Page last updated: Wed 12/7/2016 03:05:34 AM