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Pelican Technical Article:

Wiper Component Replacement

Nick Czerula

Time:

3 hours3 hrs

Tab:

$400

Talent:

*****

Tools:

T30 Torx socket, 13mm socket, flathead screwdriver, pliers

Applicable Models:

Mercedes-Benz W211 (2003-09)

Parts Required:

Wiper motor, wiper motor assembly, wiper blades, wiper cowl trim

Hot Tip:

Use paint or crayon to mark location of wiper arms before removing

Performance Gain:

Repair faulty wiper blades, wiper motor or wiper motor linkage

Complementary Modification:

Replace wiper blades when servicing motor

The windshield wiper motor is a permanent magnet electric motor that runs the windshield wipers via a linkage (transmission). The motor speed is controlled via a stalk with input from the driver through a control module. The motor drives linkages that are connected to pivot that turn the wiper arms to clear the windshield. On Mercedes-Benz W211 models, the linkage runs multiple pivots to add stiffness to the wiper drive.

This article will cover replacing the windshield wiper motor and linkage on Mercedes-Benz W211 models. The wiper motor can be replaced in a few hours with minor disassembly of the wiper cowl. The wiper motor itself can fail, creating a situation where the wipers do not work or do not properly park. If the wipers do not work at all, check that the wiper pivots move free and are not bound with corrosion. To do this, follow the steps noted below. If you are having an issue with wiper blade chatter or streaking, try replacing your wiper blades.

Remember that your car may have been serviced before and had parts replaced with different size fasteners used in the replacement. 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.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve, as they grow older. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Disconnect the negative battery cable. See our tech article on battery replacing and reconnecting notes.

The wiper arms (green arrows) are driven by a motor (red arrow) located beneath the wiper cowl trim.
Figure 1

The wiper arms (green arrows) are driven by a motor (red arrow) located beneath the wiper cowl trim.

Remove the wiper cowl seal (red arrow).
Figure 2

Remove the wiper cowl seal (red arrow). Start at the left side and peel it off the cowl.

Working at the left wiper arm, mark the wiper arm location for reinstallation.
Figure 3

Working at the left wiper arm, mark the wiper arm location for reinstallation. Then remove the plastic cap covering the wiper arm nut by pulling it straight off, if equipped. Then remove the 13mm nut (red arrow).

Once the nuts are removed, wiggle the wiper arms back and forth gently and lift.
Figure 4

Once the nuts are removed, wiggle the wiper arms back and forth gently and lift. They should pop off the pivot. If they are stuck, use a battery terminal puller (red arrow) to remove them.

Wiggle the wiper arms back and forth gently and lift off.
Figure 5

Wiggle the wiper arms back and forth gently and lift off.

Working at the right wiper arm, mark the wiper arm location for reinstallation.
Figure 6

Working at the right wiper arm, mark the wiper arm location for reinstallation. Then remove the plastic caps covering the wiper arm nuts by pulling them straight off, if equipped. Then remove the 13mm nuts (red arrows).

Once the nuts are removed, wiggle the wiper arms back and forth gently and lift.
Figure 7

Once the nuts are removed, wiggle the wiper arms back and forth gently and lift. They should pop off the pivot. If they are stuck, use a battery terminal puller (red arrow) to remove them.

Working at the center of the wiper cowl, remove the plastic Phillips head screws (red arrows).
Figure 8

Working at the center of the wiper cowl, remove the plastic Phillips head screws (red arrows). Once the screws are removed, pull out the center-expanding anchor (inset).

Working at the left side of the wiper cowl, remove the plastic Phillips head screw (red arrow).
Figure 9

Working at the left side of the wiper cowl, remove the plastic Phillips head screw (red arrow). Once the screws are removed, pull out the center-expanding anchor. Repeat this step for the right side.

Working at the right side of the wiper cowl, remove the washer hose from the mount (red arrow).
Figure 10

Working at the right side of the wiper cowl, remove the washer hose from the mount (red arrow).

Now you have to remove the wiper cowl trim.
Figure 11

Now you have to remove the wiper cowl trim. Start by grabbing at the right corner of the windshield and pulling up, gently removing the trim piece from the mounting bracket located at the base of the windshield. Work your way across the windshield (red arrows) as you detach it.

At the left the cowl and detach the drain hose from the center.
Figure 12

At the left the cowl and detach the drain hose from the center.

Once detached, remove it from the vehicle and store it in a safe place.
Figure 13

Once detached, remove it from the vehicle and store it in a safe place.

Working at the center of the wiper transmission, remove the 13mm fastener (red arrow).
Figure 14

Working at the center of the wiper transmission, remove the 13mm fastener (red arrow).

Working at the left and right side of the wiper transmission, remove the 13mm fasteners (red arrows).
Figure 15

Working at the left and right side of the wiper transmission, remove the 13mm fasteners (red arrows). Lift the wiper assembly up and slide it out of the cowl far enough to access the electrical connector. Then disconnect the wiper motor electrical connector by releasing the tabs and pulling it straight off.

Mercedes-Benz does not sell the wiper motor or assembly as separate parts.
Figure 16

Mercedes-Benz does not sell the wiper motor or assembly as separate parts. This does not mean there will not be an aftermarket replacement part. Or, you could be replacing the motor or linkage assembly with used parts from a donor car. Use the following steps to separate the motor from the linkage. Place the wiper linkage on a solid surface. Then remove the linkage from the wiper motor pivot. I like to use a trim panel tool to lever it off the ball joint (red arrow). Next remove the 13mm wiper motor lever fastener (green arrow). Then remove the three T30 Torx fasteners (blue arrows). Remove the wiper motor from the linkage. If you are reusing the wiper arm pivot assembly it is a good idea to inspect the wiper arm pivots. Once the linkage assembly has been removed, check that both wiper pivots move freely and without resistance. You can do this by grabbing the linkage and moving it back and forth.

Install the new wiper motor on the linkage assembly.
Figure 17

Install the new wiper motor on the linkage assembly. Then use channel lock pliers to snap the ball socket onto the ball joint. Be sure this engages properly. You don't want to find out later it wasn't securely installed when you reassemble everything.

Then install the assembly back into the vehicle (red arrows).
Figure 18

Then install the assembly back into the vehicle (red arrows). Install all fasteners finger tight in the reverse order of removal. Then tighten. This ensures proper assembly and alignment. Connect the battery and turn the wipers ON then OFF. This will PARK the wipers. Next install the cowl support and trim. Install the wiper arms. Then reassemble the remaining items in the reverse order of removal. Once complete, check the wiper operation. If wiper arms are chattering or not wiping well, replace the wiper blades.

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Comments and Suggestions:
Frencheric Comments: Hi
When I start the car the wiper will not work at all. But if I turn the car off & restart the wipers work. It's very strange. Could it be the wiper motor it seems like it not enough power to them started.
Great work guys.
March 27, 2016
  Followup from the Pelican Staff: Hard to say, does the motor get the signal to turn on? I would start there. - Nick at Pelican Parts  
deejaz63 Comments: You guys are wonderful. I have replaced both my water pump and wiper motor utilizing your technical guide. Your pictures are truly a time saver. Thank you very much.

Proud owner of a 2004 W211 E320 4Matic Sedan
92000 miles and still rolling.
November 5, 2015
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 

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