Jonathan Yarden Mar 25, 2021 · 5 min. read
In this article you will find a description of fuses and relays GMC,
with photos of block diagrams and their locations.
Highlighted the cigarette lighter fuse (as the most popular thing people look for).
Get tips on blown fuses, replacing a fuse, and more.
Year of production: 2001, 2002
Instrument Panel Circuit Breaker Block
This fuse block is in the lower portion of the instrument panel, to the left of the steering column.
7.2L and 8.1L Fuse block
| Name | Circuits protected |
| HYD BRK | Brake Pump Motor Relay, Alarm Module |
| ENG1 | Engine Control Module (Diesel Engines), Canister Purge, Electronic Throttle Control, Mass Air Flow, Engine Control Module (Gasoline Engines), Transmission Shift Solenoid (Gasoline Engines) |
| B/U IGN3 | Fuel Filter Relay, Blower Motor Relays, ABS Power Relay, Back-Up Lamps, Auxiliary Wiring Relay, IGN 3 Relay, Power Window Relay, Vehicle Interface Module, Transmission Temperature Gage |
| STOP | Stoplamps, Stoplamp Relay |
| WASH/WIPE | Windshield Wipers/Washer, Accessory Relay |
| DOME/PNL | Dome Lamp, Radio, Lighting Relay, Instrument Panel Lights, A/C Controller, Headlamp/Seatbelt Module |
| BLOWER | Blower Motor |
| A/C | A/C Clutch Compressor, A/C Controller, A/C Clutch Relay |
| TRN/HAZ | Turn Signals, Hazard Flashers |
| CHAS | Exhaust Brake, Air Suspension Dump Valve, Air Dryer, HYD ABS ECU, Dual Fuel Tank Module, Auxiliary Fuel Pump |
| PARK LP | Auxiliary Wiring, Parking Lamps, Taillamps, Marker Lamps, Trailer Running Lamps, Lighted Mirrors |
| HORN | Horn/Diagnostic Connector |
| PRK BRK | Parking Brake Module, Parking Brake Solenoid |
| FUEL | Heated Fuel Filter (Diesel Engines) or Fuel Pump (Gasoline Engines) |
| AXLE | Heated Mirrors, Radiator Shutters, Two-Speed Axle Motor, Two-Speed Axle Switch |
| MRKR LP | Roof Marker Lamps, Trailer Marker Lamps, Marker Lamp Relay |
| CIG/AUX | Cigarette Lighter, Auxiliary Power Jacks |
| AUX-BATT | Auxiliary Wiring (Battery) |
| DR LK/WDO | Power Windows, Power Door Locks |
| ENG2 | Ignition Coils (Even), Fuel Injectors Even Bank (Gasoline Engines), Vehicle Interface Module-Battery (Diesel Engines), Transmission Control Module-Battery (Diesel Engines) |
| CRNK | Starter Relay, Ether Start (Diesel Engines) |
| IGN SW | Instrument Panel Cluster Telltales, Daytime Running Lamp Module, Daytime Running Lamp Relay, Alarm Module, Ignition 1 Relay, Vehicle Interface Module (Diesel Engines), Parking Brake Module, Transmission Relay Coil |
| AUX-IGN | Auxiliary Wiring (Ignition) |
| RDO | Radio, Auxiliary Wiring |
| ENG3 | Ignition Coils (Odd), Fuel Injectors Odd Bank (Gasoline Engines), Transmission Control Module (Diesel Engines), Transmission Shift Solenoid (Diesel Engines) |
Alternate 7.2L Fuse block
| Name | Circuits protected |
| HYD BRK | Brake Pump Motor Relay, Alarm Module |
| ENG1 | Engine Control Module (Diesel Engines), Canister Purge, Oxygen Sensors (Gasoline Engines) |
| B/U IGN3 | Fuel Filter Relay, Blower Motor Relays, ABS Power Relay, Back-Up Lamps, Auxiliary Wiring Relay, IGN 3 Relay, Power Window Relay, Vehicle Interface Module, Transmission Temperature Gage |
| STOP | Stoplamps, Stoplamp Relay |
| WASH/WIPE | Windshield Wipers/Washer, Accessory Relay |
| DOME/PNL | Dome Lamp, Radio Lighting Relay, Instrument Panel Lights, A/C Controller, Headlamp/Seatbelt Module, Engine Control Module (Gasoline Engines) |
| BLOWER | Blower Motor |
| A/C | A/C Clutch Compressor, A/C Controller, A/C Clutch Relay |
| TRN/HAZ | Turn Signal Lamps, Hazard Lamps |
| CHAS | Exhaust Brake, Air Suspension Dump Valve, Air Dryer, HYD ABS ECU, Dual Fuel Tank Module, Auxiliary Fuel Pump |
| ENG2 | Ignition Coils, Fuel Injectors Even Bank (Gasoline Engines) |
| PARK LP | Auxiliary Wiring, Parking Lamps, Taillamps, Marker Lamps, Trailer Running Lamps, Lighted Mirrors |
| HORN | Horn/Diagnostic Connector |
| PRK BRK | Parking Brake Module, Parking Brake Solenoid |
| FUEL | Heated Fuel Filter (Diesel Engines) or Fuel Pump (Gasoline Engines) |
| AXLE | Heated Mirrors, Radiator Shutters, Two-Speed Axle Motor, Two-Speed Axle Switch |
| MRKR LP | Roof Marker Lamps, Trailer Marker Lamps, Marker Lamp Relay |
| CIG/AUX | Cigarette Lighter, Auxiliary Power Jacks |
| AUX-B | Auxiliary Wiring (Battery) |
| IGN RLY/VIM | Vehicle Interface Module (Diesel Engines), Mass Air Flow, Engine Control Module, Electronic Throttle Control (Gasoline Engines) |
| WDO | Power Windows |
| ENG3 | Ignition Coils, Fuel Injectors Odd Bank (Gasoline Engines) |
| CRNK | Starter Relay, Ether Start (Diesel Engines) |
| IGN SW | Instrument Panel Cluster Telltales, Daytime Running Lamp Module, Daytime Running Lamp Relay, Alarm Module, Ignition 1 Relay |
| AUX-I | Auxiliary Wiring (Ignition) |
| RDO | Radio, Auxiliary Wiring |
| DR LK | Power Door Locks |
Maxi-Fuse Block
With air brakes
With hydraulic brakes
| Name | Circuits/Circuit Breakers Protected |
| STP/HAZ TURN | Stoplamp, Turn Signal/Hazard Lights, Fuel |
| IGN SW3 | Air Conditioner, Ignition Switch, Axle, Chassis, Ignition Relay |
| INT/EXT LIGHTS | Parking Lamps, Dome/Panel Lights, Marker Lamps |
| HEAD LAMP | Headlamps, Daytime Running Lamps |
| AUX WRG | Auxiliary, Parking Brake |
| IGN SW1 | Ignition Switch, Wash/Wipe, Crank, Radio |
| HYD PUMP | Hydraulic Brake, Brake Pump Motor |
| HYD ABS | Hydraulic ABS |
| AIR ABS | Air ABS, ABS Power Relay, Trailer Wiring |
| PWR WDO/LCKS | Window, Door Locks |
| PARK BRK | Parking Brake Motor |
| TRLR | Trailer |
| BLOWER HORN | Blower, Horn, Cigarette Lighter/Auxiliary |
| FUEL/ENGINE | Ignition Coils, Fuel Injectors (Gasoline Engines), Transmission Control Module (Diesel Engines), Engine Controls |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
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