OK, so I pulled the entire heated seat harness (power - two relays, 4 plugs, two switches, and the coin tray)...I'm not entirely certain that my seats have the heating elements in them.

I did fine one extra plug that I hope goes to the heating element, which would mean that both elements are powered by one plug on the 90. On the 88 that I extracted the heating wiring harness from, the seats had two plugs...one for the back element and one for the butt element.

Anybody know that much about the differences between the 88 and the 90? I wouldn't think that they would be that different between the two years....but I hope they are so that I didn't do all that extraction work for nothing.

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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