1997 D1, located behind the battery. Do not see any mating connector, and didn't find it in the electrical manual. Orange wire with grey tracer.
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That plug is for the ABS pump.
I'd bet it is C118 which is a connector between a maxi fuse and the heated front screen relay.
See pages 25 (A1 - 5) and 509 (view #264) of the ETM.
ETM can be found in my sig.
Since my model doesn't have the heated front screen feature, there's no P139 for it to connect to. I guess they just used the same harness for all trim levels.
I don't see this connector under the hood of my 97