GMC Envoy I (1997-2000) Rear defogger & heated mirrors circuit, manual a/c

BLK WIRE BRN WIRE GRY WIRE HOT AT ALL TIMES HOT IN RUN HOT IN RUN AND START HTDMIR FUSE HVAC 1 FUSE 21 HVAC CONTROLLER (UNDER CENTER OF DASH) I/P FUSE BLOCK (ON LEFT SIDE OF DASH) IGN E FUSE 27 ILL LEFT OUTSIDE REAR VIEW MIRROR NCA WIRE ON LED PPL REAR DEFOGGER RELAY REAR PUSHBUTTON REAR WINDOW DEFOGGER GRID RIGHT OUTSIDE REAR VIEW MIRROR RR DEFOG FUSE SPLICE PACK TIMER CIRCUIT UNDERHOOD ELECTRICAL BUSSED CENTER (UBEC) WHT WIRE