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E36/7 Z3 (1996-2002)
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  #1  
Old 12-28-2009, 06:43 PM
Belgirb Belgirb is offline
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Location: Eugene, Oregon
 
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Mein Auto: 2000 BMW Z3 2.5
Z3: Electric Seat Problem

My passenger seat will operate forward and backward, but not up and down. Unfortunately, it's stuck in the high position. I took the seat out hoping to find a loose connection, but assuming I'd at least find a way to manually lower the seat. I pretty much figured out how the motors drive the mechanisms, but I could not find a way to manually lower the seat. Any help would be appreciated.

Also, it would seem the weak link in the operation would be the switch which people grab and mangle. Has anyone had experience with actually fixing the electronics in the seat.

Thanks in advance. Jim
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  #2  
Old 12-29-2009, 03:51 PM
PDP///M PDP///M is offline
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Unless the seat is binding due to worn seat bushings, usaully the motor goes bad. I'm the lucky guy who's had both happen, and actually the exact same motor as yours. Cant manually lower seat unless you disassemble drive mechanism.
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Old 12-29-2009, 04:04 PM
Belgirb Belgirb is offline
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Followup to bad seat motor

Okay. Can the motor itself be replaced, or does the entire seat chassis have to be replaced? If yes, can a DYIer replace the motor, and if not, where do I go for help (and please don't say the dealer). Thanks. Jim
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Old 12-29-2009, 04:45 PM
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EOD Guy EOD Guy is offline
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If you managed to get the seat uot ..... you should have little trouble replacing the motor. You might consider taking the motor out, lowering the seat then putting the busted motor back in. I don't think I have ever moved the seats up or down. Ebay might be a good place to start for used seats motors...... but most want to sell you the whole seat base, but if they don't get any bids they might just sell the motor.
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  #5  
Old 12-30-2009, 07:24 AM
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Mpire Mpire is offline
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Mein Auto: S54 M Coupe x2, M52 Z3
Pull the seat out and run the motor back and forth with power tapped straight from the battery to the harness on the motor.

You can test it out and make sure its not the switch or anything like that.
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  #6  
Old 12-30-2009, 09:21 AM
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Randy Forbes Randy Forbes is offline
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Quote:
Originally Posted by Mpire View Post
Pull the seat out and run the motor back and forth with power tapped straight from the battery to the harness on the motor.

You can test it out and make sure its not the switch or anything like that.
I concur.

Brown should be the ground wire (jump to chassis), then there there should be a terminal that runs the motor in each direction. Just *flash* the power to the terminal until you know which direction you want to go.

I made up a short harness that I can attach to a battery (via marine style post clamps) and a spare connector plug that matches the seat's power socket (12VDC to supply power to the seat's switch). Sometimes I need it when I'm doing seat bushings.

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  #7  
Old 12-30-2009, 08:27 PM
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Captain Roundel Captain Roundel is offline
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I get BMW seats from the local BMW wrecking yard. The parts are so expensive its easier just to replace the whole thing for a couple hundred bucks. My .02c worth!!
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  #8  
Old 12-31-2009, 09:42 AM
PDP///M PDP///M is offline
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Its been a while since i replaced my seat motor but from what i remember the motor is less than "couple hundred bucks" i believe around 60 bucks, maybe less. If the seat is already out, like randy and other have said just directly hook up the motor to a 12v source to be positive it sthe motor. The motor is easy to replace.
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