Rear power window/motor DIY - Mercedes-Benz Forum
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post #1 of 134 (permalink) Old 12-30-2011, 03:12 PM Thread Starter
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Rear power window/motor DIY

To investigate problems with a W209 rear power window failing to operate correctly, there are a number of drawings in the WIS that cover the steps required. These are included below.

This is the sequence:

1. Removal of the side panels to inspect the glass & motor
2. Removal of the rear side window (glass)
3. Removal of the rear side window (regulator)
4. Removal of the power window motor.

Note: As I have not done this procedure myself, I have no idea where the pitfalls are!
Attached Files
File Type: pdf W209 rear side panel.pdf (808.8 KB, 8562 views)
File Type: pdf W209 rear power window.pdf (521.4 KB, 6550 views)
File Type: pdf W209 rear power window regulator.pdf (411.2 KB, 7261 views)
File Type: pdf W209 rear power window motor.pdf (403.4 KB, 5558 views)
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post #2 of 134 (permalink) Old 02-22-2012, 12:19 PM
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I want to thank keyhole for posting the WIS's for replacing the rear window regulator on the W209. I was able to save $400+ in labor to the mechanic

The procedures outlined in the WIS's are pretty much exactly how it goes. Use each WIS in the order keyhole has them posted. The one thing I didn't see in there (and maybe I just missed it--which would have saved me some frustration had I seen it ) is that in the coupe, in order to remove the lower side panel, it is necessary to remove the C-pillar trim panel by removing the SRS badge and accessing the Torx screw underneath. Once that's out, the panel just unclips, the lower panel will be free to move and you have access to the innards.

I had replaced a couple of regulators in the past in other cars, so I was shocked at how much this part cost (found it on partsgeek for $440+) So, I was needless to say happy to avoid paying my friendly neighborhood dealership another $400+ to do the job. It took me about 2 hours to tear it all down and an additional 2 hours to put everything back together. If I ever have to do it again (God please no), I'm sure I can do it quicker

Last edited by g8rdmd29; 02-22-2012 at 12:23 PM.
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post #3 of 134 (permalink) Old 02-22-2012, 07:12 PM
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Just curious, what was wrong with the regulator? I had a failure of one on the C240 and it was just the plastic clip at the bottom of the glass (a common failure). I fixed it with a small bolt and nut.

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post #4 of 134 (permalink) Old 11-18-2012, 11:51 AM
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Post 3D Puzzle

I have a 2005 CLK320 coupe, my rear driver-side window 'klunked' when opening the door and the window dropped an inch and froze there. Following Keyhole's excellent posts I was able to remove the bad regulator (a plastic block connecting the 2 ends of the lift cable snapped and jammed the unit). PartsGeek and the Mercedes on-line parts sites both had units at $385. Things to be aware of during this process - 1)if your window is not fully closed the bolts on the lower window will not line up with the access holes on the inner panel & you'll need an offset wrench, 2)before you install the new unit set the adjustment bolt at the bottom of the unit (the one accessed under the ext trim) to the same depth as the old one or the window won't seat properly when closed, 3) remove the battery cable to reset the window memory so the new unit will be able to close fully. There's no way you'd be able to attempt this without Keyhole's posts - lot's of 'hidden' bolts/releases, take your time and you can do this yourself without too much aggravation.
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post #5 of 134 (permalink) Old 11-18-2012, 12:48 PM
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Quote:
Originally Posted by RadicalModerate View Post
remove the battery cable to reset the window memory so the new unit will be able to close fully.
Instead of doing that, why not just pull the fuse - #32 for left rear, #33 for right rear.

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post #6 of 134 (permalink) Old 12-12-2014, 08:21 AM
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Hey guys, so my right rear passenger window regulator just committed suicide. I have a 2004 CLK 500 convertible. Would this WIS be the same steps for a convertible?
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post #7 of 134 (permalink) Old 12-12-2014, 09:24 AM Thread Starter
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Originally Posted by Danish View Post
Would this WIS be the same steps for a convertible?
Unfortunately not. It is another set of WIS drawings which I will dig out later.
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post #8 of 134 (permalink) Old 12-12-2014, 01:18 PM
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Thanks keyhole. Appreciate it
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post #9 of 134 (permalink) Old 12-12-2014, 02:45 PM Thread Starter
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Here we go. I always felt that the cabrio was harder to work on than the coupe. These procedures convince me that I am right!

I have included 2 additional drawings that might be required. There are also further WIS drawings to 'adjust' the glass - but changing the regulator should not require that.

1. remove/install cabrio rear seats & backrests.
2. remove/install cabrio rear side panelling
3. remove/install W209 seat belt extender
4. remove/install cabrio rear side window (glass)

continued...
Attached Files
File Type: pdf W209.4 rear seat and backrest.pdf (564.1 KB, 3006 views)
File Type: pdf W209.4 rear side paneling.pdf (581.7 KB, 2871 views)
File Type: pdf W209 seat belt extender.pdf (958.4 KB, 2659 views)
File Type: pdf W209.4 rear side window.pdf (417.0 KB, 2970 views)
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post #10 of 134 (permalink) Old 12-12-2014, 02:45 PM
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Thanks keyhole . However, I can't find the additional drawings you included.
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