GMC Suburban C2500 (1985-1999) i/p fuse block Wiring diagrams

BACKUP LAMPS SIGNAL (TRAILER TOW PACKAGE) (WIRE CUT AND TAPED TO HARNESS) BLK WIRE FROM LICENSE LAMP BREAKOUT) HOT IN RUN OR START I/P FUSE BLOCK LEFT BACKUP LAMP LT GRN WIRE MIRRORS SYSTEM PARK/NEUTRAL POSITION SWITCH (LEFT CENTER OF TRANSMISSION) PNK A/T WIRE PNK M/T WIRE PNK WIRE RIGHT BACKUP LAMP TURN B/U FUSE 16

33 (OR 1134) 592 592 150 DRL RELAY CTRL BLK WIRE BLK/WHT WIRE BRN WIRE BULB CHECK 1317 39 10 10 FOG LAMPS IGNITION LAMP FEED PNK WIRE DIODE 203 (I/P HARNESS, RIGHT SIDE OF STEERING COLUMN) DK BLU WIRE DK GRN/WHT WIRE DRL-FOG FUSE 15 FOG LAMP RELAY (UNDER LEFT END OF I/P) FOG LAMP SWITCH GAGES FUSE 4 GRN WIRE GROUND GRY WIRE HEAD HEAD OFF OFF PARK PARK HEAD- LAMP DIMMER SWITCH HEADLAMP, PANEL DIMMER SWITCH HI LO HOT AT ALL TIMES HOT IN RUN, BULB TEST OR START I/P FUSE BLOCK IGNITION SWITCH ILLUM LAMP INSTRUMENT CLUSTER HI BEAM INDI- CATOR DRL INDI- CATOR INSTRUMENT CLUSTER SYSTEM LEFT FOG LAMP RIGHT FOG LAMP LEFT HEAD- LAMP LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE NCA WIRE OFF ON INDICATOR ORG/ WIRE PARK BRAKE WARNING SWITCH (ON PARK BRAKE) PNK WIRE PPL PPL PPL RIGHT HEAD- LAMP TAN WIRE TAN/WHT WIRE W/ FOG LAMPS YEL WIRE

BLK WIRE COURTESY LAMPS CIRCUIT CTSY FUSE 3 FRONT DOME/ READING LAMPS HEADLAMP, PANEL DIMMER SWITCH COURTESY LAMPS HOT AT ALL TIMES I/P FUSE BLOCK INT LAMP OUTPUT ORG/ WIRE OVERHEAD CONSOLE READING LAMPS REAR DOME READING LAMPS REMOTE CONTROL DOOR LOCK RECEIVER (W/RKE) (BEHIND CENTER OF DASH) WHT WIRE

A/C COMP MINI FUSE A/C MAXI FUSE 3 MAXI FUSE 4 A/C RELAY AUX FAN RELAY MINI FUSE AUXILIARY COOLING FAN RELAY BLK WIRE BLK/RED WIRE BLOWER LOW RELAY BLOWER RELAY BLU WIRE BRAKE LAMP RELAY UNDERHOOD FUSE-RELAY CENTER CARGO LAMP SWITCH (PICK-UP ONLY) CONVENIENCE CENTER CONVENIENCE CONVENIENCE CENTER CENTER CTSY FUSE 3 DAYTIME LEFT RUNNING COURTESY LAMPS LAMP RELAY DIESEL DIESEL EXCEPT DIESEL DIESEL GASOLINE DIODE DRL/FOG FUSE 15 ECM-B MINI FUSE ELECTRONIC CONVENIENCE CENTER BRAKE CONTROL MODULE FRONT DOME/ READING LAMPS FUEL PUMP OIL PRESSURE SWITCH AND SENDER FUEL PUMP RELAY UNDERHOOD FUSE-RELAY CENTER FUSIBLE LINK (10 GA-RUST) GAS GENERATOR HEADLAMP AND PANEL DIMMER SWITCH HEATER AND A/C CONTROL SWITCH HORN MINI FUSE HORN RELAY I/P COMPARTMENT LAMP I/P FUSE BLOCK INTERIOR LAMP CONTROL MODULE LEFT BATTERY (DIESEL) LEFT ILLUMINATED VANITY MIRROR MAXI FUSE MAXI FUSE 2 MAXI FUSE 8 ORG/ WIRE PK LPS FUSE 9 POWERTRAIN CONTROL MODULE (DIESEL) REAR DOME READING LAMPS RED WIRE REMOTE BATTERY STUD RIGHT BATTERY RIGHT COURTESY LAMP RIGHT FRONT DOOR COURTESY LAMP RIGHT REAR DOOR COURTESY LAMP RR-DEFOG MINI FUSE STARTER MOTOR SOLENOID TO FUSIBLE LINK (DIAGRAM 4 OF 4) TO UNDERHOOD FUSE-RELAY CENTER (DIAGRAM 2 OF 4) UNDERHOOD FUSE-RELAY CENTER UNDERHOOD LAMP UNDERHOOD REEL LAMP VEHICLE CONTROL MODULE (GASOLINE) YEL WIRE

AUDIO ALARM MODULE AUX/PWR FUSE 7 AUXILIARY POWER CONNECTOR BLK WIRE BRN WIRE CIG LTR FUSE 13 CIGAR LIGHTER CONVENIENCE CENTER CRANK FUSE 8 DATA LINK CONNECTOR DOOR REMOTE CONTROL LOCK DOOR LOCK RELAY RECEIVER FROM UNDERHOOD FUSE-RELAY CENTER (DIAGRAM 1 OF 4) I/P FUSE BLOCK IGNITION SWITCH INSTRUMENT CLUSTER LEFT FRONT DOOR LOCK SWITCH LEFT FRONT RIGHT FRONT POWER DOOR LOCK DOOR LOCK AMPLIFIER SWITCH SWITCH RELAY LEFT POWER SEAT LOCK LOCK OFF OFF LOCK OFF M/T A/T MAXI FUSE 5 MAXI FUSE 6 MAXI FUSE 7 NCA WIRE ORG/ WIRE PNK WIRE POWER WDO CIRCUIT BREAKER PPL PWR-ACCY CIRCUIT BREAKER RADIO RADIO BATT FUSE 19 RADIO FUSE 17 REAR DOOR DOOR LOCK LOCK SWITCH CONTROL MODULE REAR WINDOW LOCKOUT SWITCH (4-DR) RED WIRE REMOTE CONTROL DOOR LOCK RECEIVER RIGHT FRONT DOOR LOCK SWITCH RIGHT FRONT POWER LUMBAR SEAT SWITCH RIGHT FRONT POWER POWER WINDOW WINDOW MASTER SWITCH SWITCH (2 DR, UTILITY) RR WIPER FUSE 23 WIPER FUSE 11 RUN WIRE STARTER RELAY UNDERHOOD FUSE-RELAY CENTER STOP/HAZ FUSE 1 SUBURBAN ONLY SUBURBAN/ UTILITY PICKUP T CASE FUSE 2 TCC/STOPLAMP SWITCH TO I/P FUSE BLOCK (DIAGRAM 4 OF 4) TO SECURITY/ STRG FUSE 21 (DIAGRAM 4 OF 4) TO UNDERHOOD FUSE-RELAY CENTER (DIAGRAM 3 OF 4) TRANS FUSE 20 TRANS- MISSION TRANSFER CASE CONTROL MODULE TURN/ HAZARD SWITCH UNDERHOOD FUSE-RELAY CENTER W/BENCH SEAT W/O BENCH SEAT WHT WIRE WINDSHIELD RADIO WIPER MOTOR MODULE YEL WIRE

4.3L PNK WIRE 7.4L 6.5L 7.4L W/ CALIFORNIA EMISSIONS OTHERS A/C CLUTCH RELAY A/T M/T AIR BAG FUSE 10 AIR INJECTION REACTION SECONDARY RELAY BACKUP LAMP SWITCH BLK WIRE CAMSHAFT EXHAUST POSITION GAS SENSOR RECIRCULATION VALVE CONVENIENCE CENTER DAYTIME AUDIO RUNNING ALARM MODULE LAMPS RELAY DIESEL ONLY PNK WIRE EGR SOLENOID ELECTROCHROMATIC MIRROR W/ COMPASS ELECTRONIC INJECTION PUMP ENG-1 MINI FUSE EVAPORATIVE EMISSION CANISTER VENT EVAPORATIVE FUEL EMISSIONS PUMP CANISTER PURGE BALANCE SOLENOID VALVE RELAY FROM IGNITION SWITCH (DIAGRAM 2 OF 4) FUEL EGR GLOW WATER-IN- HEATER VENT PLUG FUEL SOLENOID CONTROL SENSOR MODULE FUEL FUEL FUEL INJECTOR INJECTOR INJECTOR FUEL FUEL INJECTOR INJECTOR FUEL INJECTOR FUEL PUMP BALANCE MODULE FUEL SOL MINI FUSE ECM 1 MINI FUSE FUEL TANK DAYTIME SENDER RUNNING I/P MODULE LAMPS CLUSTER MODULE (4.3L) GASOLINE DIESEL 5.0L, 5.7L 4.3L GAUGES FUSE 4 HEATED HEATED MASS OXYGEN OXYGEN AIRFLOW SENSOR 1 SENSOR 2 SENSOR HEATED HEATED OXYGEN OXYGEN SENSOR 4 SENSOR 3 I/P FUSE BLOCK IGN E MINI FUSE IGNITION CRANK- CONTROL SHAFT MODULE POSITION SENSOR IGNITION CRANK- FUEL CONTROL SHAFT INJECTOR MODULE POSITION SENSOR INFLATABLE RESTRAINT I/P MODULE ENABLE SWITCH INFLATABLE RESTRAINT SENSING AND DIAGNOSTIC MODULE M/T MASS AIR FLOW SENSOR NCA WIRE PNK WIRE POWER STEERING CONTROL MODULE POWERTRAIN CONTROL MODULE TRANSFER CASE CONTROL MODULE TURN B/U FUSE 16 TURN SIGNAL SWITCH UNDERHOOD FUSE-RELAY CENTER VEHICLE CONTROL MODULE VEHICLE IGNITION CONTROL COIL MODULE WASTEGATE SOLENOID YEL WIRE

BLK WIRE BRN WIRE END- GATE MARK- ER LAMPS ENDGATE CROUND EXTERIOR LAMPS CIRCUIT HEADLAMP, PANEL DIMMER SWITCH HOT AT ALL TIMES I/P FUSE BLOCK LEFT FRONT CLEAR- ANCE LAMP LEFT REAR CLEAR- ANCE LAMP LEFT REAR FENDER LEFT TAIL/ STOP/ TURN LAMP OFF ORG/ WIRE PARADE MODE SW PARK PARK LPS FUSE 9 RHEO- STAT RIGHT FRONT CLEAR- ANCE LAMP RIGHT REAR CLEAR- ANCE LAMP RIGHT REAR FENDER RIGHT TAIL/ STOP/ TURN LAMP

"GLOW PLUGS" INDICATOR BLK WIRE BLK/WHT WIRE BRN WIRE BRN/WHT WIRE DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE ECM-B FUSE FUEL LIFT PUMP (INSIDE LEFT FRAME RAIL, BELOW DRIVER'S DOOR) FUEL PUMP PRIME CONNECTOR (LEFT SIDE OF ENG COMPT) FUEL PUMP RELAY (IN UNDER FUSE- RELAY CENTER) FUEL PUMP/OIL PRESSURE SWITCH (UNDER INTAKE MANIFOLD, CENTER OF ENGINE) GAUGES FUSE 4 GRN WIRE GRY WIRE HOT AT ALL TIMES HOT IN RUN OR START I/P FUSE BLOCK INSTRUMENT CLUSTER INSTRUMENT CLUSTER SYSTEM INSTRUMENT CLUSTER SYSTEM (FUEL PUMP BALANCE RELAY) LT GRN WIRE ORG/ WIRE PNK PNK 9 10 WIRE PNK PNK PNK WIRE PNK WIRE RED WIRE SERVICE ENGINE SOON INDICATOR SERVICE THROTTLE SOON INDICATOR TAN WIRE UNDERHOOD FUSE-RELAY CENTER VEHICLE SPEED INPUT W/O DUAL TANK W/ DUAL TANKS WAIT TO WATER IN FUEL INDICATOR WATER IN-FUEL SENSOR (ON FUEL FILTER/ MANAGER) WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

1 2 3 4 5 6 7 8 9 PPL 16 PPL AUTOMATIC TRANSMISSION INPUT SHAFT SPEED SENSOR (LEFT SIDE OF TRANSMISSION) BALANCE FUEL PUMP (ON INSIDE LEFT FRAME RAIL NEAR FRONT OF REAR TANK) BLK WIRE BLK/WHT WIRE BLU WIRE BLU/WHT WIRE BRN WIRE BRN/WHT WIRE CONVENIENCE CENTER (UNDER LEFT SIDE OF DASH) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE FUEL GAUGE INPUT FUEL PUMP BALANCE MODULE (INSIDE LEFT SIDE OF FRAME RAIL) FUEL PUMP BALANCE RELAY (ON FUEL PUMP BALANCE MODULE) FUEL PUMP, SENDER (IN FUEL TANK) FUEL TANK PRESSURE SENSOR (IN FUEL TANK) GAUGES FUSE 4 GRN WIRE GROUND GRY WIRE HOT IN OFF, RUN OR START HOT IN RUN OR START HOT IN RUN OR START UNDERHOOD FUSE-RELAY CENTER I/P FUSE BLOCK IGN E FUSE INPUT INSTRUMENT CLUSTER INTAKE AIR TEMPERATURE SENSOR (IN AIR INTAKE DUCT) LT BLU WIRE LT BLU/WHT WIRE LT GRN WIRE MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR (TOP RIGHT FRONT OF ENGINE) MASS AIR FLOW SENSOR (IN AIR INTAKE DUCT) OUTPUT TO GAUGE PNK (TAILLAMP EXTENSION HARN, 6 CM FROM FUEL PUMP HARN BREAKOUT) WIRE PNK IGNITION WIRE PNK PNK PNK WIRE PNK WIRE PPL PPL/WHT WIRE PRIMARY TANK FUEL LVL SIG RED WIRE RED/BLK WIRE RELAY CTRL SECON TANK FUEL LVL SIG SECONDARY FUEL GAUGE SENDER (IN FUEL TANK) SERVICE ENGINE SOON INDICATOR SPEEDOMETER TACHOMETER TAN WIRE THROTTLE POSITION SENSOR (ON THROTTLE BODY ASSEMBLY) TRANS FUSE 20 W/ DUAL FUEL TANKS W/O DUAL FUEL TANK W/O DUAL FUEL TANK W/ DUAL FUEL TANKS W/O DUAL FUEL TANKS W/ DUAL FUEL TANK WHT (OR WIRE WHT WIRE YEL WIRE

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 PPL A/C REQUEST SIGNAL AIR CONDITIONING SYSTEM AIR INLET VLV MTR CTLR BLK WIRE BLK/WHT WIRE BLU WIRE BLU/WHT WIRE BRAKE FUSE 18 BRN WIRE BRN/WHT WIRE CLUTCH PEDAL POSITION (CPP) SWITCH (AT TOP OF CLUTCH PEDAL BRACKET) CPP SW INPUT FOUR WHL DR SIG LO CRUISE CTRL SIG ENG 23 24 CRUISE CONTROL MODULE (LEFT REAR OF ENGINE COMPT, ON FIREWALL) DATA LINK CONNECTOR (UNDER LEFT SIDE OF DASH, LEFT SIDE OF STEERING COLUMN) DISTRIBUTOR DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE EGR VLV FEED ELECTRONIC VARIABLE ORIFICE/ PASSLOCK CONTROL MODULE (CENTER OF DASH) FORCE MOTOR FEED TRANS INPUT SPEED RTN TRANS INPUT SPEED SIG EST OUTPUT SIG FORCE MOTOR RETURN GROUND GROUND SENSOR GROUND FUEL PUMP PRIME CONNECTOR (LEFT REAR OF ENG COMPT) FUEL PUMP RELAY FUEL PUMP RLY CTRL 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 GRN WIRE GROUND GRY WIRE GRY/BLK WIRE HIGH VOLTAGE COIL WIRE HOT AT ALL TIMES UNDERHOOD FUSE- RELAY CENTER ECMB FUSE HOT IN RUN I/P FUSE BLOCK IGN BRAKE INPUT INPUT SW INPUT IGNITION COIL (TOP LEFT REAR OF ENGINE) IGNITION CONTROL MODULE (ON REAR OF INTAKE MANIFOLD) IGNITION FEED IGN TIMING SIG. IGN COIL OUT IGNITION PRESSURE SWITCH INPUT PRESSURE SWITCH INPUT LT BLU/BLK WIRE LT BLU/WHT WIRE LT VSS SERIAL INPUT DATA SIG ORG/ WIRE PNK IGNITION FOUR WHL DR SIG EGR VLV GROUND WIRE PNK PNK PNK WIRE PNK WIRE PPL PPL (OR PPL A/T M/T PPL FUEL LEVEL INPUT SWITCH SIGNAL PPL PPL PPL PPL 420 OR PRESSURE SWITCH INPUT RADIO RED WIRE RED/BLK WIRE SENSOR RETURN SPEED SENSOR SPEED STOPLAMP/ VCM SENSOR CLUTCH SIG INPUT SWITCH INPUT STOPLAMP SWITCH (TOP OF BRAKE PEDAL) SWITCH SIGNAL TRANSFER CASE CONTROL MODULE (UNDER DASH ON STEERING COLUMN SUPPORT BRACKET) TRANSFER CASE SWITCH (LEFT TOP OF TRANSFER CASE) UNDERHOOD FUSE-RELAY CENTER VEHICLE CONTROL MODULE (VCM) (LEFT SIDE OF ENGINE COMPT) VSS SIG OUT VSS SIG OUT CHECK ENG LP CTRL 389 419 WHT WIRE WHT/BLK WIRE