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Rear Wiper and Motor Replacement
 
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Pelican Technical Article:

Rear Wiper and Motor Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$10 to $180

Talent:

**

Tools:

10mm, 13mm wrench, needle nose pliers

Applicable Models:

Mercedes-Benz W124 (1986-95)

Parts Required:

New rear wiper motor, arm and wiper blade

Hot Tip:

Always lever the hatch panel and wiper arm off gently

Performance Gain:

See out rear window

Complementary Modification:

Replace front wiper blades

The rear windshield wiper is attached to the motor through a hole on the hatches glass. You can service the wiper arm and install new blades from the outside.

If your rear windshield wiper motor is going bad you will need to remove the rear hatch panel (red arrow) and third back light housing (yellow arrow) to gain access to it.
Figure 1

If your rear windshield wiper motor is going bad you will need to remove the rear hatch panel (red arrow) and third back light housing (yellow arrow) to gain access to it. Please see our article on removing the hatch panel for additional assistance.

The plastic rear section of the housing clips into the forward section.
Figure 2

The plastic rear section of the housing clips into the forward section. Use a trim removal tool and separate the clips (red arrows) on the rear section from the front. The front section is mounted to the hatch but if you handle it too aggressively you can break it completely off. Some of these can be a real pain to remove without damaging the plastic.

Working on the outside of the hatch flip up the cover on the wiper arm (red arrow) and remove the 13mm nut (yellow arrow) holding the wiper arm to the motor shaft.
Figure 3

Working on the outside of the hatch flip up the cover on the wiper arm (red arrow) and remove the 13mm nut (yellow arrow) holding the wiper arm to the motor shaft.

Gently wiggle and pull the wiper arm off of the shaft.
Figure 4

Gently wiggle and pull the wiper arm off of the shaft. In situations where the arm may be really corroded on you may need to use some penetrating oil and a puller. With the arm off make sure to remove the washer between the arm and shaft (red arrow).

Working back inside the interior remove the wiring for the brake light by pulling it straight off from the housing (red arrow).
Figure 5

Working back inside the interior remove the wiring for the brake light by pulling it straight off from the housing (red arrow).

Remove the three 10mm nuts holding the motor in place (red arrows).
Figure 6

Remove the three 10mm nuts holding the motor in place (red arrows).

On some of the newer units there is a wire circular clip that helps seal the shaft around the grommet going through the rear windshield.
Figure 7

On some of the newer units there is a wire circular clip that helps seal the shaft around the grommet going through the rear windshield. You will need to remove the clip (yellow arrow) from the collar; I like to move it towards the motor. This will free up the shaft and allow you to remove the motor and shaft from the windshield.

With the clip removed you can pull the motor out from the windshield.
Figure 8

With the clip removed you can pull the motor out from the windshield. The clip on our motor ended up around the lower part of the base of the motor and shaft (red arrow). When installing you must transfer the clip ring to the plastic collar in the grommet on the windshield. The base plastic grommet remains on the base of the motor (yellow arrow).

This photo illustrates the collar that the clip needs to go on before installation of the motor.
Figure 9

This photo illustrates the collar that the clip needs to go on before installation of the motor. It is part of the grommets that go through the windshield. Place the clip on the lower section of the collar. There is a cut out along the lower section that the clip will sit in (red arrow).

Follow the wiring until it arrives at the connection in one of the access cut outs in the hatch.
Figure 10

Follow the wiring until it arrives at the connection in one of the access cut outs in the hatch. The connection hangs up side down so there is a metal collar that holds the connections together (yellow arrow). Pry the connection from its mount (red arrow) and slide the metal collar off.

You can now pull the connection apart.
Figure 11

You can now pull the connection apart. The connection is open on the back so note the position of the wires as they can fall out of the sockets. Installation is the reverse of removal.


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