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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Sun, Sep-22-2019, 02:09:40 AM   #1
h82crash
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Default Window circuit experts please help

I've tried some other forums with little luck, so bear with me.

I know there are lots of threads on this subject but, it's always the same answers on all of the threads. I'm seeking some discussion regarding the inch-by-inch problem.
It is usually shrugged off as friction. Solution; clean or replace.
I disagree on the friction diagnosis, as many others have. The window and regulator move freely and even with assistance putting no load on the motor, it still stops. Also, with everything clean and lubed, it shouldn't stop on the way down.

My issue is intermittent .As a troubleshooter, my assessment is different. Sometimes the window operates normally, but mostly the inch at a time.
After observing the operation for awhile I believe the system thinks the window is in the full up position and hitting the down button triggers the anti-pinch function. This is why pushing the up button does nothing when the door is open. Close the door and it bumps up an inch. A press of the up button and it thinks the door was just shut, another bump up. Also, the anti-pinch function does its thing with the window in all positions.

So, the question is, where does the source of the problem, in fact, lie? How does the motor know whether it's a door open or button press? I read another thread where a "window module" was mentioned. Does that exist?
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Old Sun, Sep-22-2019, 12:13:08 PM   #2
M_Parallel
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Default Re: Window circuit experts please help

Maybe it’s me, but I don’t read the problem that needs solving.

A window not going fully up usually means the power has been cut while open.

If that happens you need to press the door-open/close switch continuously untill the window reaches the top.
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Old Tue, Sep-24-2019, 04:32:52 PM   #3
h82crash
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Default Re: Window circuit experts please help

I don't know if I wasn't clear. With each press and hold of the window switch, the window moves about 5/8" or about 15 mm. I have to press the switch about 30 times to full open or close the window. Intermittent, some days it works fine, others take hitting the switch like the fire button on a video game.

It's a late 92 build date, so I'm told the module is in the motor itself.
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Old Tue, Sep-24-2019, 05:11:27 PM   #4
M_Parallel
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Default Re: Window circuit experts please help

Ah an early one. That has totally different window electronics I'm not familiar with.
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Old Mon, Sep-30-2019, 12:08:51 PM   #5
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Default Re: Window circuit experts please help

I do not know if the E36 has that, E32 and E34 models have in the general module a overload protection relay for locking, windows, sunroof etc.
The GM has an internal overload relay which reacts when
-there is > than 60 seconds in excess of up to 36A
-there is > than 0.3 seconds between 36 and 60A or overload
-there is > than 0.1 seconds more than 60A (short circuit)
and the GM switches that function completely off and switches it on when ignition has been switched off once for 60 seconds.
diagram for E32 and E34 http://www.e32-schrauber.de/bmw/daten/zke/bild21.jpg

Maybe you check the wiring diagrams for the E36 https://www.bmwtechinfo.com/etm/data/toc_cd2.pdf
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Last edited by Eric M3; Mon, Sep-30-2019 at 02:16:09 PM.
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Old Mon, Sep-30-2019, 06:32:52 PM   #6
M_Parallel
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Default Re: Window circuit experts please help

His 1992 doesn’t have a GM.

Don’t know if the pre-GM cars have an overload protection.
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Old Mon, Sep-30-2019, 07:42:53 PM   #7
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Default Re: Window circuit experts please help

You might have better luck in the regular E36 section at www.bimmerforums.
Also, you probably have a bad regulator/motor assembly where the friction sensor gets ultra sensitive as it fails. That's why it stops so much. I don't know of a simple fix. Replacement is usually the answer.
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Discussing 1998 Alpine White Sedan Build Thread in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)