
Both can be traced back to ground on the harness side.
I've scoured the diagrams I can find, including the '92 USDM manual posted here on LC. The only ground that any of the diagrams show is the one related to the engine ECU. That one is still in position in the connector. These two must go to different pins. I'm assuming they are redundant grounds intended for different computers in the vehicle.
You can see the Engine ECU ground in the 6th postion on the left.

Either way, I know thay are not important at this point, but I'd like to at least find a home for them. Can anybody shed a bit of light here?