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Pelican Technical Article:

Windshield Wiper Motor Replacement

Kerry Jonsson

Time:

3 hours3 hrs

Tab:

$400

Talent:

***

Tools:

Phillips head screwdriver, 5mm Allen head socket and rachet

Applicable Models:

Mercedes-Benz R129 (1990-02)

Parts Required:

Cruise control switch, steering angle sensor, steering wheel adjustment switch,

Hot Tip:

Mark where the windshield wiper should go before you remove it

Performance Gain:

Get the front windshield wiper to work

Complementary Modification:

Change the wiper blade while you're at it

If you want to drive your car in the rain you are going to need a functioning windshield wiper motor. On the w129 chassis, Mercedes-Benz uses a single windshield wiper arm. There is no need for a transmission to synchronize the movement between two wiper arms like most other cars have. This single windshield wiper motor and arm has a linkage to keep the windshield wiper arm in the area around the windshield as it sweeps across. The windshield wiper motor is integrated into the mounting bracket and is replaced as an assembly. The wiper and windshield wiper arm are replaceable items and can be serviced separately.

ThisPicture illustrates the cowl area at the base of the windshield in the engine compartment.
Figure 1

ThisPicture illustrates the cowl area at the base of the windshield in the engine compartment. Remove the windshield / engine compartment seal (green arrow) by pulling it away from the plastic covers it sits on.

Pull the left side plastic filter screen straight up from its mounted position and remove it from the engine compartment.
Figure 2

Pull the left side plastic filter screen straight up from its mounted position and remove it from the engine compartment.

Pull the right side plastic filter screen straight up from its mounted position and remove it from the engine compartment.
Figure 3

Pull the right side plastic filter screen straight up from its mounted position and remove it from the engine compartment.

Lift up the wiper arm cover from the motor side first and unclip it from the wiper arm.
Figure 4

Lift up the wiper arm cover from the motor side first and unclip it from the wiper arm. Remove the cover in the direction of the green arrow.

Remove the four Phillips head fasteners (green arrow) that hold down the electronics cover and remove the cover (yellow arrow).
Figure 5

Remove the four Phillips head fasteners (green arrow) that hold down the electronics cover and remove the cover (yellow arrow).

Remove the Phillips head fasteners (green arrows) for the right side windshield cover.
Figure 6

Remove the Phillips head fasteners (green arrows) for the right side windshield cover.

Lift the cover straight up and remove it from the cowl area.
Figure 7

Lift the cover straight up and remove it from the cowl area.

ThisPicture illustrates the back of the engine compartment by the cowl area.
Figure 8

ThisPicture illustrates the back of the engine compartment by the cowl area. Remove the engine compartment seal (green arrows). Pull the seal off starting on the right side. Then continue to peel it off until it is removed.

Working at the cowl, remove the two Phillips head fasteners (green arrows).
Figure 9

Working at the cowl, remove the two Phillips head fasteners (green arrows).

Once the fasteners have been removed, lift the center cowl trim up to detach it from body.
Figure 10

Once the fasteners have been removed, lift the center cowl trim up to detach it from body. The throttle cable (green arrow) will remain in the cowl trim piece. Just lay the piece aside, leaving the throttle cable attached.

Unclip the three clips (green and yellow arrows) on the front of the cabin air filter housing by moving them in the direction of the blue arrow.
Figure 11

Unclip the three clips (green and yellow arrows) on the front of the cabin air filter housing by moving them in the direction of the blue arrow. In this photo, one clip on the left side of the car (green arrow) is already unclipped, and the other clips (yellow arrows) are still holding the housing together.

Loosen the two Phillips head screws (green arrows).
Figure 12

Loosen the two Phillips head screws (green arrows). The screws will stay with the cover when removing.

Lift the cabin microfilter housing cover up to remove it.
Figure 13

Lift the cabin microfilter housing cover up to remove it.

Remove the two Phillips head fasteners (green arrows) for the windshield wiper motor cover.
Figure 14

Remove the two Phillips head fasteners (green arrows) for the windshield wiper motor cover.

Pull out the ambient air temperature sensor by pulling it to the left (green arrow) out of its mounting bracket.
Figure 15

Pull out the ambient air temperature sensor by pulling it to the left (green arrow) out of its mounting bracket.

Lift the wiring harness for the ambient air temperature sensor from its groove in the cabin air filter housing (arrows).
Figure 16

Lift the wiring harness for the ambient air temperature sensor from its groove in the cabin air filter housing (arrows).

Lift the left side of the windshield wiper motor cover out of the cowl area to detach it.
Figure 17

Lift the left side of the windshield wiper motor cover out of the cowl area to detach it.

Lift the right side of the windshield wiper motor cover out of the cowl area to detach it.
Figure 18

Lift the right side of the windshield wiper motor cover out of the cowl area to detach it. Then remove the cover from the vehicle.

Lift and remove the small windshield wiper cover insert out from underneath the windshield wiper motor.
Figure 19

Lift and remove the small windshield wiper cover insert out from underneath the windshield wiper motor.

Using a 5mm Allen head socket with ratchet remove the windshield wiper arm fastener.
Figure 20

Using a 5mm Allen head socket with ratchet remove the windshield wiper arm fastener.

Remove the windshield wiper arm by moving it in the direction of the blue arrow.
Figure 21

Remove the windshield wiper arm by moving it in the direction of the blue arrow.

Remove the three 10mm fasteners (green arrows) that mount the windshield wiper motor assembly.
Figure 22

Remove the three 10mm fasteners (green arrows) that mount the windshield wiper motor assembly.

This photo shows the fasteners under the wiper motor, in the cowl.
Figure 23

This photo shows the fasteners under the wiper motor, in the cowl. Remove the two 8mm fasteners (green arrows) for the base windshield wiper motor mount.

Pull the windshield wiper motor assembly out from the cowl area.
Figure 24

Pull the windshield wiper motor assembly out from the cowl area.

Figure 25

Unplug the electrical connector from the windshield wiper relay in the right side of the cowl area

Route the windshield wiper motor harness from the relay through the opening in the windshield wiper motor lower cover.
Figure 26

Route the windshield wiper motor harness from the relay through the opening in the windshield wiper motor lower cover. Installation is the reverse of the removal steps. Route the wiring harness for the windshield wiper motor through the opening in the lower cover and plug it into the relay. Position the windshield wiper motor in the cowl area and mount the three fasteners. Fit and mount the two fasteners for the windshield wiper lower mount and tighten them down. Install the windshield wiper arm onto the windshield wiper motor assembly, tighten down the fastener and fit the cover by sliding in the arm side in first and push down on the back of the cover. Install the windshield wiper motor small insert under the windshield wiper motor assembly. Fit both left and right sides of the windshield wiper motor cover in place below the windshield wiper motor assembly. Route the wiring harness for the ambient air temperature sensor in the cabin air filter lower housing and seat the ambient air temperature sensor in its bracket. Tighten down the two fasteners on the left side of the windshield wiper motor cover. Install and tighten down the cabin air filter upper cover fasteners and snap the three clips in place. Fit the cowl insert and tighten down the two screws. Fit the engine compartment seal, as well as the right side and left side windshield covers with mounting screws. Install the right side electronics cover and tighten down the fasteners. Snap the left and right side filter screens on each side of the windshield wiper motor assembly and install the seal between the windshield and the engine compartment.

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Comments and Suggestions:
Bob Comments: Nick, 1994 SL500. I had to remove the wiper assembly and the shroud under it to gain access to the expansion valve which was located under the shroud on the drivers side.
May 20, 2016
  Followup from the Pelican Staff: Thanks for the additional info. We appreciate it.
- Nick at Pelican Parts
 
Bob Comments: Great instructions: Once the windshield system is removed is the expansion valve exposed to the point where it can be replaced?
Thanks,
Bob
May 16, 2016
  Followup from the Pelican Staff: Good question. I am not 100% sure the wiper assembly has to be removed. What vehicle are you working on? - Nick at Pelican Parts  

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Page last updated: Mon 12/5/2016 02:28:00 AM