GMC Pickup C1500 (1985-1999) vehicle interface unit Wiring diagrams

AUTOMATIC TRANSFER CASE CONTROL MODULE (BEHIND LEFT SIDE OF DASH) AUX PWR FUSE 7 BLK WIRE BLK/WHT WIRE DATA LINK CONNECTOR (DLC) (UNDER LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) DIAG ENABLE DIESEL GASOLINE DK GRN WIRE ELECTRONIC BRAKE CONTROL MODULE (EBCM) (ON LEFT SIDE OF ENGINE COMPT) EXCEPT LUXURY HOT AT ALL TIMES I/P FUSE BLOCK INFLATABLE RESTRAINT SENSING, DIAGNOSTIC MODULE (UNDER DRIVER'S SEAT CARPET) ORG/ WIRE PPL PPL DATA CLSS 2 PROG ENABLE RADIO REMOTE CONTROL DOOR LOCK RECEIVER (BEHIND CENTER OF DASH) SERIAL DATA TAN WIRE TAN/WHT WIRE UART DATA VEHICLE CONTROL MODULE (VCM) (ON LEFT SIDE OF ENGINE COMPT) VEHICLE INTERFACE UNIT

AUDIO ALARM MODULE AUDIO AMPLIFIER AUTOMATIC AUTOMATIC TRANSFER CASE AUTOMATIC TRANSFER CASE CONTROL MODULE BASE AUX/PWR FUSE 7 BASE CARGO DOOR UPPER LEVLE BATTERY FUSE 7 BLK WIRE CIG LTR FUSE 13 CIGAR LIGHTER COLUMN HARNESS BREAKOUT) CONVENIENCE CENTER DATA LINK CONNECTOR DOOR REAR LIFTGATE LOCK DOOR RELEASE CONTROL LOCK RELAY MODULE SWITCH ELECTRIC FROM UNDERHOOD FUSE-RELAY CENTER (DIAGRAM 1 OF 6) I/P CLUSTER BREAKOUT) I/P FUSE BLOCK INSTRUMENT CLUSTER LEFT FRONT DOOR LOCK SWITCH LIFTGATE RELEASE SWITCH NON- BASE ORG/ WIRE OTHERS PICKUP POLICE PACKAGE UPPER LEVEL POWER OUTLET BREAKOUT) PWR-ACCY CIRCUIT BREAKER (REGULAR CAB/EXTENDED CAB) RADIO RADIO BATT FUSE 19 REAR AUXILIARY POWER CONNECTOR REAR CONSOLE AUXILIARY POWER CONNECTOR RED WIRE REMOTE CONTROL DOOR LOCK RECEIVER REMOTE RIGHT FRONT CONTROL DOOR LOCK DOOR LOCK SWITCH RECEIVER RIGHT FRONT LEFT FRONT POWER POWER LUMBAR LUMBAR SEAT SWITCH SEAT SWITCH RIGHT LUMBAR POWER SEAT RIGHT LUMBAR POWER SEAT SWITCH RIGHT POWER SEAT ADJUSTER SWITCH SEAT LUMBAR SWITCH BREAKOUT) STEERING COLUMN HARNESS BREAKOUT) STOP LAMP SWITCH STOP/HAZ FUSE 1 SUBURBAN/ UTILITY SWITCH T CASE FUSE 2 TO SEATS FUSE (DIAGRAM 3 OF 6) TRANSFER CASE CONTROL MODULE TURN/ HAZARD SWITCH UNDERHOOD FUSE-RELAY CENTER UPPER LEVEL VEHICLE INTERFACE UNIT W/ RKE W/BENCH SEAT W/O RKE