Automatic day/night mirror circuit for GMC Envoy II (2001-2009)

BACK UP LAMP SUPPLY VOLTAGE BACK UP LAMP SUPPLY VOLTAGE ON/OFF BLK WIRE BODY CONTROL MODULE (BENEATH LEFT REAR SEAT, ON REAR FUSE BLOCK) COMPUTER DATA LINES SYSTEM GROUND HOT IN RUN OR START IGN 1 IGN E FUSE 22 INSIDE REARVIEW MIRROR LOGIC LT GRN WIRE NCA WIRE PHOTO SENSOR PNK WIRE REAR FUSE BLOCK (BELOW LEFT REAR SEAT) SERIAL DATA UNDERHOOD FUSE BLOCK (ABOVE LEFT FRONT WHEELWELL)