More info;

P/N 1268206810 Switch, 2 req'd
P/N 0015454426 Pin, 12 req'd
P/N 0008210738 Connector, 2 req'd, note the back lock to this connector was not available so the pins will need to be potted with silicone or an epoxy.

Power was obtained from fuse #10, this was labelled on the fuse cover for seat heat, the fuse was upgraded from a 8A to a 16A per the fuse cover placard. Fuse #10 feeds through the fuse block to connector #L in the cabin interior. Connector #L is a 2 pin on the forward end of the block, verify with a DVM.

More later....

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'87 190E 2.3-16
Heated Seats, Graphite Dash,
Delsing shift bushings