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Rear side window won't move

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bigboystoy
Posts: 29
Joined: Wed Feb 13, 2019 4:22 am
Location: Melbourne, Australia

Rear side window won't move

Post by bigboystoy » Mon Apr 08, 2019 4:45 am

This last weekends job was to get both rear side windows to operate. Since owning the car, they've refused to move.

So, started with the passenger side. Easy fix. The rear switch was not plugged in. Its not fast but it does now go up and down. Win for me.

The drivers side has proved to be a bit more difficult. There's power and earth to the rear switch and the switch itself operates when tested but there's no movement at all of the window. I tried pushing the window down whilst holding the switch but still nothing, not even a sound.

Do the window motors have a tendency to fail or should I be looking for a fault somewhere else. If it has failed, or for further testing, how do I get to it.
Past toys:
1979 Volvo282GT
1988 Porsche 944S
Current toy:
1986 635 CSi

baders
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Re: Rear side window won't move

Post by baders » Mon Apr 08, 2019 7:41 am

Remove the rear trim and grab your multimeter !
1986 635csi LOCUTUS / Arktis Blau Metallic / Pearl Beige / S38B36/ Close ratio dogleg 5sp
2002 E46 M3 / Topaz Blau Metallic / Black Nappa / 6 speed SMG software tuned / Bilstein PSS10 Coilovers

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Hefeweizen
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Re: Rear side window won't move

Post by Hefeweizen » Mon Apr 08, 2019 11:36 pm

Did you swap out the switches? Then try Baders's suggestion
Rainer
85 635CSi (Silver, Daily Driver)
79 633CSi (Red Euro, Project)

"If you think a good European mechanic is expensive, try a bad one!"

wfwright2
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Location: Chesapeake, Virginia, USA

Re: Rear side window won't move

Post by wfwright2 » Tue Apr 09, 2019 1:54 pm

Before tearing out the trim panel, try using the adapter from the tool kit and move the window manually a couple of times first. My M6 has this issue with the front, no electric movement, after a cycle of manual operation, the electrics work again. I think the mechanism needs living, but am putting it off till I break into the door to fix a sticky outside handle.
Wfwright2
Chesapeake, VA 23322
88 M6 Black (5/87)
07 X5 4.8l
02 X5 4.4l I killed, ignored chain rattle, 00 528iT took out by 89 t-bird
87 635csi A. Gone to new keeper, 88 535is Gone to new keeper

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JCS
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Re: Rear side window won't move

Post by JCS » Tue Apr 09, 2019 3:44 pm

Big Boy,

Or It could be the 30 + year old brown grease, on the window motor and sliders all gummed up.

Best,
Jay
'88 M6, Red/Tan
To view my newest website, with 16 website links
Please read the instructions in RED, then on page 2,3,4 to view the info panel (CAPTIONS)
http://bigcoupe.com/phpBB3/viewtopic.php?f=24&t=28245

bigboystoy
Posts: 29
Joined: Wed Feb 13, 2019 4:22 am
Location: Melbourne, Australia

Re: Rear side window won't move

Post by bigboystoy » Tue Apr 09, 2019 10:28 pm

Thanks all.

I'm guessing the motor is either dead or there's a loose connection as there's no sign of movement with the sawitch and even pushing the window up and down with both hands, the front section doesn't move but there's minor movement at the rear.

The back seat is out, so hopefully the side trim is not too hard to remove.

wfwright2, is there the ability to wind the rear window manually?
Past toys:
1979 Volvo282GT
1988 Porsche 944S
Current toy:
1986 635 CSi

wfwright2
Bigcoupe supporter
Posts: 101
Joined: Sun Mar 10, 2013 4:23 pm
Location: Chesapeake, Virginia, USA

Re: Rear side window won't move

Post by wfwright2 » Tue Apr 09, 2019 11:18 pm

Low on the side panels are plugs that can be carefully removed. Using the small Allen tool and window manual tool, hopefully both in your trunk lid tool kit. The inner concentric Allen socket fitting is turned clockwise ( if I remember correctly) to release the electric motor and gear and lock/latch the manual gearset to use the the spark plug socket to lower and raise the window. I will try to find the instructions in the owners or maintenance manual and get back shortly.
Wfwright2
Chesapeake, VA 23322
88 M6 Black (5/87)
07 X5 4.8l
02 X5 4.4l I killed, ignored chain rattle, 00 528iT took out by 89 t-bird
87 635csi A. Gone to new keeper, 88 535is Gone to new keeper

wfwright2
Bigcoupe supporter
Posts: 101
Joined: Sun Mar 10, 2013 4:23 pm
Location: Chesapeake, Virginia, USA

Re: Rear side window won't move

Post by wfwright2 » Tue Apr 09, 2019 11:23 pm

http://bigcoupe.com/phpBB3/viewtopic.ph ... ion#p62918

Try this link for additional info, one of multiple references in bigcoupe.
Wfwright2
Chesapeake, VA 23322
88 M6 Black (5/87)
07 X5 4.8l
02 X5 4.4l I killed, ignored chain rattle, 00 528iT took out by 89 t-bird
87 635csi A. Gone to new keeper, 88 535is Gone to new keeper

wfwright2
Bigcoupe supporter
Posts: 101
Joined: Sun Mar 10, 2013 4:23 pm
Location: Chesapeake, Virginia, USA

Re: Rear side window won't move

Post by wfwright2 » Wed Apr 10, 2019 12:05 am

From my owners manual
Wfwright2
Chesapeake, VA 23322
88 M6 Black (5/87)
07 X5 4.8l
02 X5 4.4l I killed, ignored chain rattle, 00 528iT took out by 89 t-bird
87 635csi A. Gone to new keeper, 88 535is Gone to new keeper

wfwright2
Bigcoupe supporter
Posts: 101
Joined: Sun Mar 10, 2013 4:23 pm
Location: Chesapeake, Virginia, USA

Re: Rear side window won't move

Post by wfwright2 » Wed Apr 10, 2019 12:14 am

Sorry, forgot size limit, now from flicker

https://flic.kr/p/RHEg4a
Wfwright2
Chesapeake, VA 23322
88 M6 Black (5/87)
07 X5 4.8l
02 X5 4.4l I killed, ignored chain rattle, 00 528iT took out by 89 t-bird
87 635csi A. Gone to new keeper, 88 535is Gone to new keeper

bigboystoy
Posts: 29
Joined: Wed Feb 13, 2019 4:22 am
Location: Melbourne, Australia

Re: Rear side window won't move

Post by bigboystoy » Thu Apr 11, 2019 10:27 am

Tonight I pulled the side panel off and thought all my prays were answered when I found the window motor was unplugged. Also noted the nut on the position adjuster had fallen off. Happily re-installed the washer and nut, made the electrical connection and hit the switch......nothing. :(

After a bit of quiet contemplation, I loosen the adjuster nut and the hit the switch again and the motor came to life and lowered the window. Unfortunately it was a one way wonder and I had to help it return to the closed position. After much adjusting of the adjuster, the motor would sometimes lift and sometimes open but its action was not consistent or satisfactory. To open, I discovered if I hit either the window or the gear cover above the motor, the window would go down easily, but it refused to go up.

I'm thinking the motor is ok but there's too much resistance in the gears so when I have time I'll have to pull it out for a closer inspection.
Past toys:
1979 Volvo282GT
1988 Porsche 944S
Current toy:
1986 635 CSi

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Hefeweizen
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Posts: 2232
Joined: Thu Jul 17, 2008 1:24 pm
Location: Colorado Springs
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Re: Rear side window won't move

Post by Hefeweizen » Thu Apr 11, 2019 1:45 pm

You are talking about a 33 year old car. My guess would be that the grease inside the motor is dried out and hardened. I have seen this for sure in the windshield wiper motor. Not sure what your temperatures are but it gets extreme hard in the cold to move. Switch may also be the culprit.
Rainer
85 635CSi (Silver, Daily Driver)
79 633CSi (Red Euro, Project)

"If you think a good European mechanic is expensive, try a bad one!"

User avatar
JCS
Bigcoupe supporter
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Joined: Wed Sep 22, 2010 11:06 pm
Location: Santa Ana, California, USA

Re: Rear side window won't move

Post by JCS » Thu Apr 11, 2019 3:41 pm

Duh
Jay
'88 M6, Red/Tan
To view my newest website, with 16 website links
Please read the instructions in RED, then on page 2,3,4 to view the info panel (CAPTIONS)
http://bigcoupe.com/phpBB3/viewtopic.php?f=24&t=28245

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