Dug into this a bit more. The E30 harness is completely self contained other than a power wire connected at the 25-pin accessory connector (C302) under the dash and a ground wire also connected under the dash (G200).
E36 looks to be basically the same, power at X63, ground at X173 with an additional wire for the switch lighting coming from the headlight switch.
So basically hook the wire from X63 into C302, ground X173 where G200 is and the light wire to the gray/red wire coming off the e30 light switch.
Wiring diagrams can be found here:
I used a 91 318is manual for E30 seats, a 94 3-series manual for E36 seats and an 88 325 manual for location views.
Good luck!
E36 looks to be basically the same, power at X63, ground at X173 with an additional wire for the switch lighting coming from the headlight switch.
So basically hook the wire from X63 into C302, ground X173 where G200 is and the light wire to the gray/red wire coming off the e30 light switch.
Wiring diagrams can be found here:
I used a 91 318is manual for E30 seats, a 94 3-series manual for E36 seats and an 88 325 manual for location views.
Good luck!
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