GMC Sierra Classic 3500 (2007-2007) Rear defogger circuit

BLK WIRE BODY CONTROL MODULE (ON LOWER LEFT SIDE OF DASH) CLASS 2 SER DATA COMPUTER DATA LINES SYSTEM HOT AT ALL TIMES HOT IN RUN, START HVAC CONTROL MODULE (IN CENTER OF DASH) I/P RELAY BLOCK (NEAR LEFT KICK PANEL) IGN LOGIC LT GRN WIRE PPL REAR DEFOG SWITCH REAR DEFOGGER RELAY REAR WINDOW DEFOGGER GRID RELAY CNTRL SERIAL DATA WHT WIRE