HELP! Somebody that knows how to track a wiring problem, please help. I accidentally applied +12v to pin 3 on the passenger mirror harness. According to the GM Upfittter diagrams, this is for the "Co-Driver Mirror Position Sensor Low Reference" (circuit 3400). It sparked and I obviously blew somthing that has to do with the mirror memory control. I can still adjust the mirrors fine, but the real problem is that I cannot save the settings.... so every time I turn off the car, the mirror self-adjusts to a bad position and I must re-adjust them every single time I get in the truck.
I'll buy a new whatever I need to replace, but the problem is... I don't know what that is.
The good news is, I got the new mirrors installed & they look great.