1999 GMC Sonoma Owner's Manual - Page 303

yellowblue Name LT TURN HDLP W/W LT TRN RT TRN RR PRK TRL PRK LT HDLP RT HDLP FR PRK INT BAT ENG I Name TRL TRN TRR TRN TRL B/U VEH B/U RT TURN Usage Not Used Not Used Not Used Vehicle Back-Up Lamps Right Turn Signal Front ECM B ABS ECM I BTSI Usage Left Turn Signal Front Not Used Left Turn Signal Rear Right Turn Signal Rear Right Rear Parking Lamps Not Used Left Headlamp Right Headlamp Front Parking Lamps I/P Fuse Block Feed Engine Sensors/Solenoids, MAF, CAM, PURGE, VENT Engine Control Module, Fuel Pump Module, Oil Pressure Anti-Lock Brake System Engine Control Module Injectors Brake-Transmission Shift Interlock 6-65