Chevrolet Chevy Express G1500 (1996-2012) Backup lamps circuit

AUTOMATIC TRANSMISSION AUTOMATIC TRANSMISSION ASSEMBLY (6 SPEED A/T) AUTOMATIC TRANSMISSION INTERNAL MODE SWITCH (IMS) AUX/TRLR BCK/UP FUSE 26 BACKUP ALARM (REAR OF VEHICLE ON FRAME) BCK/UP LAMP PCB RELAY BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (BEHIND LOWER RIGHT SIDE OF DASH) BODY FUSE BLOCK (UNDER LEFT BUS-DATA COMPUTER DATA LINES SYSTEM CONTROL SOLENOID VALVE ASSEMBLY DATA BUS - DK BLU WIRE FRONT SEAT) GMLAN HI SPD GRN WIRE GRY WIRE HI SPD GMLAN DATA BUS - HI SPD GMLAN SERIAL DATA BUS + HOT AT ALL TIMES LEFT BACKUP LAMP (CARGO/ PASSENGER) LEFT TAIL/ STOP/ TURN SIGNAL LAMP LT GRN WIRE NCA WIRE PARK/NEUTRAL POSITION (PNP) SWITCH PROVISIONAL RED WIRE RELAY CTRL RIGHT BACKUP LAMP (CARGO/ PASSENGER) RIGHT TAIL/ STOP/ TURN SIGNAL LAMP SIG A SIG B SIG C TAIL LAMP BCK/UP FUSE 27 TAN WIRE TAN/BLK WIRE TAN/WHT WIRE TRAILER CONNECTOR (IF EQUIPPED) TRANS RNG SW SIG A TRANS RNG SW SIG B TRANS- MISSION CONTROL MODULE (TCM) TRANSMISSION CONTROL MODULE (TCM) (4 SPEED A/T) UNDERHOOD FUSE BLOCK W/ ELECTRICAL BACKUP CUTAWAY ALARM YEL WIRE