f5stop,
I tried the light green wire in the A-pillar like you mentioned and I got nothing. I even tested it with my volt meter in park and reverse and there was no change on this wire. I got to thinking, why would the rear view mirror need to know when the H3 in reverse? Maybe there is some feature that my H3 does not have on the mirror. My mirror does nothting different when the H3 is in reverse.
I endend up running a wire to the engine compartment and tapping in there. Works great now.
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