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  #16  
Old 01-06-2012, 10:57 PM
LandYaghtLover's Avatar
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Join Date: Jun 2010
Location: Green Bay, WI
Posts: 1,341
I dunno. Could be, but everything works are is should.

What I am thinking is that when I call the seat to go back its grounding out somewhere. Possibly an exposed wire between the door and seat, etc. The only problem is reverse. Everything else it fine. So that narrows it down to just two wires to follow. The ca was hacked pretty bad by the PO with a stereo install. I have repaired many, many wires.

How did yours work out? Seat working well? Bypass the brain box?

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car
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  #17  
Old 01-07-2012, 10:29 AM
Shadetree
 
Join Date: Jan 2010
Location: Back in SC upstate
Posts: 1,791
Yes.

It is pretty ugly under there. I took the male plugs from the old seat and crimp them to the motor wires. Then, I put them back into their original connector in locations to match the body connector.

I thought about your wiring last night. Of course the door hinge area came to mind first.

It is clear to me that the power to move the seats using the switch comes through the switch. If not then my assembly would not work.

There is a four pin connector on the brain that has red, red w/white stripe, brown and a smaller red wire coming to it. If my guess is correct this is the power supply distributed to the motors to move the seat to the 'remembered,' location.

If there is a problem in the wiring or the switch then the memory function should, therefore, not present the smoking symptom.

I'm just trying to get your creative side roused up a bit. I hope you get this thing going your way.

Keep me posted!
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  #18  
Old 12-15-2012, 10:36 PM
Diesel Brane's Avatar
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Join Date: Mar 2009
Location: Inland Empire-So.Cal.
Posts: 4
Thanks for the information!

With all the information here I was able to retrofit seats from a "'91 SEL into my 300 SD. Took a little trial and error on my part,but was successful. Also be aware that seat belt 'clasp' part might be of a different size, so keep old parts for transplant. Thanks to everyone.
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  #19  
Old 09-17-2013, 06:38 AM
thayer's Avatar
Mercerator
 
Join Date: Oct 2008
Location: Mt. Airy, NC
Posts: 891
Power Seat Transplant

Took the seats from the 1991 SEL in the junk yard. I cut the wires while I was there and basically fashioned adapters using the cut plugs. That way, I can always go back to stock seats if I need to. It took some trial and error but I got all the functions working properly. I haven't added memory seats to them, The Solid State controller has been bypassed.

Here is my sweet sweet jumble of adapter, notice the bypassed solid state memory computer


Obviously not plug and play


14 to 12 gauge blue adapters look lovely


Had to crack open the motor connectors on the 1991 seats

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg
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