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Front Window Motor Replacement
 
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Pelican Technical Article:

Front Window Motor Replacement

Tom Morr

Time:

2 hours2 hrs

Tab:

$283

Talent:

**

Tools:

Phillips screwdrivers, T9 Torx bit, T30 Torx bit, trim removal wedges

Applicable Models:

Mercedes-Benz R170 (1998-04)

Parts Required:

Window motor

Hot Tip:

Get spare door-panel clips

Performance Gain:

Windows go up and down

Complementary Modification:

Clean or repaint door panel, replace torn weathershields, grease regulator

SLK side windows are more moody than most cars'. Because they're tied into the Vario roof system, side windows sometimes won't work, based on the whims of the roof's control unit.

Even when the roof is behaving properly, the window motors will eventually wear out. If the window switch is sending power to the plug at the window but the glass won't go up or down, the motor might be history. Pre-facelift R170s (built before February 2000) have all-aluminum window regulators. These can conceivably bend or break, but this is less likely compared to the later post-facelift cable-actuated regulators.

New OEM replacement motors aren't inexpensive. Luckily, they're fairly easy to replace. The most time-consuming part of the job is removing the door panel. Three easily accessible bolts secure the motor to the regulator. Their torque spec is 13 Nm.

Begin by disconnecting the battery and waiting fifteen minutes for the energy to discharge.
Figure 1

Begin by disconnecting the battery and waiting fifteen minutes for the energy to discharge. Next you will need to remove the door panel. Please see our article on door panel removal..

Carefully peel the weather shield or plastic toward the front of the car up to the speaker.
Figure 2

Carefully peel the weather shield or plastic toward the front of the car up to the speaker. This SLK's door panel had been removed at least once before, judging from the tears in the weather shield.

The motor's plug is accessible through a hole in the door panel.
Figure 3

The motor's plug is accessible through a hole in the door panel. Squeeze the plug's sides together to release it from the motor.

Three bolts with T30 Torx heads (blue arrows) hold the motor to the regulator.
Figure 4

Three bolts with T30 Torx heads (blue arrows) hold the motor to the regulator. Take these out, supporting the motor with a hand inside the panel. Then remove the motor through the lower access opening in the door panel.

Put a light coat of multi-purpose grease on the replacement motor's gear before re-installing it in the car.
Figure 5

Put a light coat of multi-purpose grease on the replacement motor's gear before re-installing it in the car.

For demonstration purposes, the regulator was removed to show mounting detail.
Figure 6

For demonstration purposes, the regulator was removed to show mounting detail. The motor's gear meshes with the regulator's teeth. The motors are side-specific. The post-facelift 2000-2004 SLKs use a cable-actuated regulator, so the motor-replacement theory carries over, but the specifics vary.

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Page last updated: Fri 12/2/2016 02:25:36 AM