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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 09-07-2008, 03:23 PM   #1 (permalink)
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Rear window relay?

so my rear windows do not function. wheres the relay? Is there a relay?

is this a common problem?

I know the switches are fine, cause A: i cleaned them, B: i tried the front ones in the rear ones spots. Still nothing. I cant operate them in the front or rear.


so....?
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Old 09-07-2008, 03:26 PM   #2 (permalink)
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motor is probably shot in all honesty...it happens pull the door panel and make sure the wiring is all kosher
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Old 09-07-2008, 04:00 PM   #3 (permalink)
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motor is probably shot in all honesty...it happens pull the door panel and make sure the wiring is all kosher
on both motors at the same time?

blah. She already needs a windshield and a new shift knob. Not ready to change window motors.


btw where did you get that shift knob u have? Will it fit my B/M short shifter? Does it take a beating? I bought a BMW leather knob for $65...and I broke the inside while shifting into second one day...
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Old 09-07-2008, 05:43 PM   #4 (permalink)
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ohh both windows....probably a fuse and or relay...consult the bentley i dont have mine handy
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Old 09-07-2008, 05:45 PM   #5 (permalink)
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Quote:
Originally Posted by Numark318i View Post
btw where did you get that shift knob u have? Will it fit my B/M short shifter? Does it take a beating? I bought a BMW leather knob for $65...and I broke the inside while shifting into second one day...
its a z4 2.8 5 speed metallic edition with optional leather wrap...lol its a BMW specialty accessory knob..the shift rod is a z4 3.0...really dont know if it fits the B&M but it fits factory shifters

its pretty hardcore, its metal and genuine leather...the clips inside are metal i believe...never had an issue and i quick shift like a moefoe...
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Old 09-07-2008, 06:48 PM   #6 (permalink)
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Quote:
Originally Posted by gotKRAUT View Post
its a z4 2.8 5 speed metallic edition with optional leather wrap...lol its a BMW specialty accessory knob..the shift rod is a z4 3.0...really dont know if it fits the B&M but it fits factory shifters

its pretty hardcore, its metal and genuine leather...the clips inside are metal i believe...never had an issue and i quick shift like a moefoe...
k. will look for that shift knob.

and will consult bentley.

thanks.
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Old 03-18-2009, 01:08 PM   #7 (permalink)
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Post I still haven't found what I'm looking for

Some things to check (as neither of my rears work either):

On the 91, fuse 17 (30A) controls the windows. You have a small rectangular circuit breaker above the right front console window switch. If the fuse is OK and the breaker is pushed in (no red exposed) the console switches should light up. On my 91, there's a small square button (kid switch for the rear windows) above the left front console switch. When that's toggled correctly then the switches in the rear doors should light up.

I think what I'm up against are shorts in the wiring harness. To borrow what Clubber Lang predicted in Rocky III: "Pain!"
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Old 03-24-2009, 12:45 AM   #8 (permalink)
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Follow-up:

After more thorough cleaning of two window switches, the left rear window is now working.
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Old 03-24-2009, 01:02 AM   #9 (permalink)
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yea i cleaned all the switches, tried every combination.

Im sure its a fuse, but honestly im lazy to check them. No one rides in the back of the 318. And i dont roll em down.
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Old 03-28-2009, 02:35 AM   #10 (permalink)
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Arrow One thing leads to another

Pulled a rear door electrical harness (61 12 1 381 097) from a salvage yard . Successfully swapped it into the 91. So now the right rear works and we're not popping circuit breakers and blowing fuses, but the left rear has gone inoperative again.

Prayerfully, there's another harness to be had....
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Old 03-28-2009, 07:21 PM   #11 (permalink)
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just the rear windows? all of a sudden like? the front windows work fine?
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Old 03-29-2009, 01:03 PM   #12 (permalink)
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Post Mission accomplished

Quote:
Originally Posted by silversled View Post
just the rear windows? all of a sudden like? the front windows work fine?
Mercifully it has only been the rear windows -- sudden onset -- front windows have worked fine since day 1.

On the wires leading out from the left rear window motor, I found a quarter-inch piece of insulation worn away from both wires near the connector end. After using electrical tape to fix that, I hooked it back up, but there was no improvement.

I then swapped in the second salvage yard harness, and now all my windows and door locks work.
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Old 03-31-2009, 02:25 AM   #13 (permalink)
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Post "Autopsy" on two failed rear door wiring harnesses

About a foot from the B-pillar connector, the left harness had three wires that had flexed to the breaking point (black/yellow and both blue/greens).

With the right harness, in the same location, the black/yellow and larger blue/green wire had bare copper exposed, and I'm fairly sure that was the cause of the short.

Praise God for inexpensive replacement parts and the mechanical talent to get it done.
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