GMC Envoy II (2001-2009) Back-up lamps circuit

1 2 52 50 BUS (+) BUS (-) TR SW P TR SW B 23 46 TR SW C TR SW B TR SW P TR SW A BUS (-) BUS (+) 4.2L 5.3L, 6.0L 4.2L BACKUP FUSE 27 BATTERY B/U LMP VOLT BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (BENEATH LEFT REAR SEAT, ON REAR FUSE BLOCK) COMPUTER DATA LINES SYSTEM DK GRN WIRE GRN WIRE GRY WIRE HOT AT ALL TIMES HOT IN RUN OR START LEFT BACKUP LAMP LT (NOT USED) LT GRN WIRE MIRRORS SYSTEM (AUTOMATIC DAY/ NIGHT MIRROR) NCA WIRE PARK/ NEUTRAL POSITION SWITCH (ON LOWER LEFT SIDE OF TRANSMISSION) PNK WIRE PARK/NEUTRAL POSITION SWITCH (ON LOWER LEFT SIDE OF TRANSMISSION) PNK WIRE REAR FUSE BLOCK (BELOW LEFT REAR SEAT) REAR FUSE BLOCK (BELOW LEFT REAR SEAT) TBC 5 FUSE 32 RIGHT BACKUP LAMP SER DATA SERIAL DATA TAN WIRE TAN/WHT WIRE TR SW A TR SW C TRAILER CONNECTOR TRANSMISSION CONTROL MODULE TRLR B/U FUSE 4 UNDER- HOOD FUSE BLOCK (ON LEFT SIDE OF ENGINE COMPT) WHT WIRE YEL WIRE