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Old 12-03-2005, 03:19 PM
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power seat wiring

I am trying to adapt 1992 BMW seats into a 1973 Duster.
The passenger seat is no problem (Brn=NEG and Red=POS). All (6) positions work.
When I apply power to the driver seat(which has 4 memory positions) I get no movement.
Can/should I eliminate the memory harness and splice and rewire the seat to mimic the passenger side?
Also, where does the ground go on the motors? I tried a continuity test from the BRN lead to the motor casing and had no continuity.
Thanks,
Bob

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Old 12-04-2005, 05:14 PM
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Not much info. for a response but I'll give a shot.

Assuming-- "memory" means computer controlled and if you don't have the computer, you will need to eliminate the wiring and probably relays that were controlled by the computer.
Assuming-- for the computer to know that the seat has been returned to a predetermined position it will need position feedback info. from the seat. This wiring can be abandoned.
Using the passenger seat as a wiring model. Try to duplicate the circuits and control switches.
For example, each control switch on the seat has (3) positions. Forward-off-back. Or, up-off-down etc. The memory duplicates these switches by operating a relay or similiar device. These memory controlled devices should cut out and the wires taped.
Before you go hacking away, try making a diagram of the circuits. Make sure you cut the right wires.

The BRN wire is probably connected internally to the motor windings.
Try a resistance test across the wires going into the motor(s). Or put 12volts on the motor leads to see if it runs. These motors will need to run in forward and reverse so the BRN wire may not be a ground at all but HOT in reverse and GRD in forward. That's how a DC motor is reversed.

Good Luck
See Ya
vicrod
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Old 12-04-2005, 08:46 PM
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Vicrod,
Thanks for the reply...
"Assuming-- "memory" means computer controlled " ...YES
I will try to replicate the passenger seat wiring.
I was not aware the pos/neg would need to be swapped to reverse the motor direction. Using the info you have provided, the GRD is switched, along with the POS.
I will use my multimeter and see if I can determine what is really going on. I checked and verified POS power when the switch was activated, I did not check for NEG.
Will do that tomorrow.
Thanks,
Electrically challenged Bob
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Old 12-05-2005, 07:57 PM
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Well I disconnected everything associated with the memory/computer controls. What I have left is the seat controls. I have no POS distribution or relays (must have been in the memory/controller).
The seat controls provide GRD to the FWD-BK or UP/DWN functions ( I have identified/labeled all of these wires).
Each motor has 2-14 gauge wires (motor) and 3-18 gauge wires (use is unknown).
The motors reverse if you swap POS/GRD.

What I need to build is a NEG activated polarity reverse switch/relay.
If the UP switch is engaged, (+) is activated at motor lead A and (-) at lead B.
If the DN switch is engaged, (-) is activated at motor lead A and (+) at lead B.

I think this could be accomplished with a DPDT relay, but I am not sure.

Can anyone supply me with a schematic and parts list to create this?

Thanks,
Bob
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Old 12-05-2005, 08:06 PM
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AngliaBob,

Try using a window switch. It does all the switching for you. Just hook up the battery side and the ground side. When you push the lever in one direction the motor turns CW. When you push the lever in the other direction the motor will turn CCW. You can buy replacement switches at the parts house near you.

Good Luck
Scholman
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