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General E46 Forum
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Old 05-27-2012, 03:50 PM   #1
veearrsix
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Electric rear window dead

I have just bought a 2002 330i touring, I had checked all of the electrics and noticed that one of the rear windows didn't work. This didn't phase me as I've fixed tons of dodgy electric windows over the years.

It's usually been dodgy switches, or blown fuses etc etc. But this one's got me a bit stumped.

It looks like someone else has had a go at fixing it, as the connector to the regulator has been cut and a replacement soldered on.

Anyway, the motor doesn't even attempt to move, both the switches (the one in the door and the one in the centre console) don't poke any life into it. I have swapped a switch that I know too work, and that hasn't changed anything.

I want to test the connections with a multimeter, but I'm not sure what too expect. If I could get any pointers as to how to diagnose the problem, it would be a big help.
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Old 05-27-2012, 05:51 PM   #2
scottjoh
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Apply 12V to the motor and see if it turns. You can also plug it in on the other rear door and test. If it doesn't turn with any of the switches in any position it is probably the general module.
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Old 05-27-2012, 06:04 PM   #3
veearrsix
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There are 2 wires going to the regulator, I'm assuming both of these are live, for turning the motor in each direction... And that the regulator earths itself on the door somehow. Is this correct?
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Old 05-27-2012, 07:04 PM   #4
scottjoh
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Quote:
Originally Posted by veearrsix View Post
There are 2 wires going to the regulator, I'm assuming both of these are live, for turning the motor in each direction... And that the regulator earths itself on the door somehow. Is this correct?
No. You said you've fixed tons of dodgy electric windows over the years. This one is no different that any other car. When energized one wire is 12 Volts the other ground. It's reversed for spinning the other direction.
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Old 06-02-2012, 05:21 PM   #5
veearrsix
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Turns out it was a simple dead motor, water had rusted away the springs holding in the brushes. However, it's an aftermarket, non oem regulator, so I'm pretty stuffed getting a new motor to fit. So it's new motor, regulator and wiring (the non oem motor has a non oem connector too!)
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Old 06-02-2012, 07:15 PM   #6
scottjoh
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There has got to be a breaker nearby that you can get a used oem motor & regulator from. Ask them for the mating connector with a couples inches of wire.
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Old 06-03-2012, 02:35 AM   #7
veearrsix
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I don't know of any, I should probably start up a new thread, but if anyone knows of a decent breakers yard near Ashford (TW15), I'd be grateful for any info. I don't mind getting my hands dirty either, so if its more of a scrap yard that's cool.
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Old 07-01-2012, 01:43 PM   #8
StaindDragon
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I have a 2001 325i and my rear driver side window is stuck down. I do not have the cash to replace the part at the moment so I am trying to get the window up and just leave it until I can replace the part. Now I have the door panel off and the vapor shield removed without tearing it. I'm not sure what to do next to get the window up. I tried tugging it and it goes up until the slack in the wire is gone. Here is where I am stuck. I'm not sure what to do next and I have to get the window up for I'm sure it's going to rain in the next week or two once. Help!!
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Old 07-01-2012, 02:16 PM   #9
dmax
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dragon...

Part of your predicament is that the clips from regulator onto the bottom of the window, are obstructed by the regulator arms.

There's a screw that goes through to a bushing on the back of that red clip (two clips at bottom of window).

If you can get to motor, take it out...something is jammed in the regulator...maybe cut a cable if you need to, but you should be able to get it up...then I've heard of someone cutting a 2x4 the right length to wedge the window up from the bottom...something like that should work okay for you until you can fix it.

Also, sounds like you're beyond the zip tie fix, but there is one way the regulators break that you can repair with a ziptie or two...if you search 'ziptie and regulator' I think you'll find a diy on it.

GL...hth.

Oh, btw, before disconnecting the air bag, you should disconnect battery 5 mins. before...otherwise you'll get an airbag code which you'll have to have cleared to remove light.
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