Jonathan Yarden Oct 22, 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: 2003, 2004
Engine Compartment Fuse Block
The fuse block is located under the hood in the engineĀ compartment on the driverās side of the vehicle.
L6 Engine
| Fuses | Usage |
| 1 | Electrically-Controlled AirĀ Suspension |
| 2 | Passengerās Side High-Beam Headlamp |
| 3 | Passengerās Side Low-BeamĀ Headlamp |
| 4 | Back-Up-Trailer Lamps |
| 5 | Driverās Side High-Beam Headlamp |
| 6 | Driverās Side Low-Beam Headlamp |
| 7 | Wash |
| 8 | Automatic Transfer Case |
| 9 | Windshield Wipers |
| 10 | Powertrain Control Module B |
| 11 | Fog Lamps |
| 12 | Stop Lamp |
| 13 | Cigarette Lighter |
| 14 | Ignition Coils |
| 15 | Air Suspension Ride |
| 16 | TBD-Ignition 1 |
| 17 | Crank |
| 18 | Air Bag |
| 19 | Electric Brake |
| 20 | Cooling Fan |
| 21 | Horn |
| 22 | Ignition E |
| 23 | Electronic Throttle Control |
| 24 | Instrument Panel Cluster, DriverĀ Information Center |
| 25 | Automatic Shift Lock Control System |
| 26 | Engine 1 |
| 27 | Back-Up |
| 28 | Powertrain Control Module 1 |
| 29 | Oxygen Sensor |
| 30 | Air Conditioning |
| 31 | Truck Body Controller |
| 32 | Trailer |
| 33 | Anti-Lock Brakes (ABS) |
| 34 | Ignition A |
| 35 | Blower Motor |
| 36 | Ignition B |
| 50 | Passengerās Side Trailer Turn |
| 51 | Driverās Side Trailer Turn |
| 52 | Hazard Flashers |
Ā
| Relays | Usage |
| 37 | Blank |
| 38 | Rear Window Washer |
| 39 | Fog Lamps |
| 40 | Horn |
| 41 | Fuel Pump |
| 42 | Windshield Wipers/Washer |
| 43 | High-Beam Headlamp |
| 44 | Air Conditioning |
| 45 | Cooling Fan |
| 46 | Headlamp Driver Module |
| 47 | Starter |
Ā
| Miscellaneous | Usage |
| 48 | Instrument Panel Battery |
| 49 | Blank |
V8 Engine
| Fuses | Usage |
| 1 | Electrically-Controlled AirĀ Suspension |
| 2 | Passengerās Side High-Beam Headlamp |
| 3 | Passengerās Side Low-BeamĀ Headlamp |
| 4 | Back-Up-Trailer Lamps |
| 5 | Driverās Side High-Beam Headlamp |
| 6 | Driverās Side Low-Beam Headlamp |
| 7 | Wash |
| 8 | Automatic Transfer Case |
| 9 | Windshield Wipers |
| 10 | Powertrain Control Module B |
| 11 | Fog Lamps |
| 12 | Stop Lamp |
| 13 | Cigarette Lighter |
| 14 | Ignition Coils |
| 15 | Cannister Vent |
| 16 | TBD-Ignition 1 |
| 17 | Crank |
| 18 | Air Bag |
| 19 | Electric Brake |
| 20 | Cooling Fan |
| 21 | Horn |
| 22 | Ignition E |
| 23 | Electronic Throttle Control |
| 24 | Instrument Panel Cluster, DriverĀ Information Center |
| 25 | Automatic Shift Lock Control System |
| 26 | Engine 1 |
| 27 | Back-Up |
| 28 | Powertrain Control Module 1 |
| 30 | Air Conditioning |
| 31 | Truck Body Controller 1 |
| 32 | Trailer |
| 33 | Anti-Lock Brakes (ABS) |
| 34 | Ignition A |
| 35 | Blower Motor |
| 36 | Ignition B |
| 50 | Passengerās Side Trailer Turn |
| 51 | Driverās Side Trailer Turn |
| 52 | Hazard Flashers |
| 53 | Oxygen Sensor Bank A |
| 54 | Oxygen Sensor Bank B |
| 55 | Injector Bank A |
| 56 | Injector Bank B |
Ā
| Relays | Usage |
| 37 | Headlamp Washer |
| 38 | Rear Window Washer |
| 39 | Fog Lamps |
| 40 | Horn |
| 41 | Fuel Pump |
| 42 | Windshield Wipers/Washer |
| 43 | High-Beam Headlamp |
| 44 | Air Conditioning |
| 45 | Cooling Fan |
| 46 | Headlamp Driver Module |
| 47 | Starter |
| 58 | Ignition 1 |
Ā
| Miscellaneous | Usage |
| 48 | Instrument Panel Battery |
Ā
Rear Underseat Fuse Block
Envoy
| Fuses | Usage |
| 01 | Right Door Control Module |
| 02 | Left Door Control Module |
| 03 | Liftgate Module 2 |
| 04 | Truck Body Controller 3 |
| 05 | Rear Fog Lamps |
| 06 | Liftgate Module/Driver Seat Module |
| 07 | Truck Body Controller 2 |
| 08 | Power Seats |
| 09 | Blank |
| 10 | Driver Door Module |
| 11 | Amplifier |
| 12 | Passenger Door Module |
| 13 | Rear Climate Controls |
| 14 | Left Rear Parking Lamps |
| 15 | Auxiliary Power 2 |
| 16 | Vehicle Center High-Mounted StopĀ Lamp |
| 17 | Right Rear Parking Lamps |
| 18 | Locks |
| 19 | Blank |
| 20 | Sunroof |
| 21 | Lock |
| 23 | Blank |
| 24 | Unlock |
| 25 | Blank |
| 26 | Blank |
| 27 | OH Battery/OnStarĀ® System |
| 29 | Rainsenseā¢ Wipers |
| 30 | Parking Lamps |
| 31 | Truck Body Controller 4 CruiseĀ Control |
| 32 | Truck Body Controller 5 |
| 33 | Front Wipers |
| 34 | Vehicle Stop |
| 35 | Blank |
| 36 | Heat Ventilation Air Conditioning B |
| 37 | Front Parking Lamps |
| 38 | Left Turn Signal |
| 39 | Heat Ventilation Air Conditioning 1 |
| 40 | Truck Body Controller 4 |
| 41 | Radio |
| 42 | Trailer Park |
| 43 | Right Turn Signal |
| 44 | Heat Ventilation Air Conditioning |
| 45 | Rear Fog Lamps |
| 46 | Auxiliary Power 1 |
| 47 | Ignition 0 |
| 48 | Four-Wheel Drive |
| 49 | Blank |
| 50 | Truck Body Controller Ignition |
| 51 | Brakes |
| 52 | Truck Body Controller Run |
Ā
Envoy XL
| Fuses | Usage |
| 01 | Right Door Control Module |
| 02 | Left Door Control Module |
| 03 | Liftgate Module 2 |
| 04 | Truck Body Controller 3 |
| 05 | Rear Fog Lamps |
| 06 | Liftgate Module/Driver Seat Module |
| 07 | Truck Body Controller 2 |
| 08 | Power Seats |
| 09 | Blank |
| 10 | Driver Door Module |
| 11 | Amplifier |
| 12 | Passenger Door Module |
| 13 | Rear Climate Controls |
| 14 | Left Rear Parking Lamps |
| 15 | Auxiliary Power 2 |
| 16 | Vehicle Center High-Mounted StopĀ Lamp |
| 17 | Right Rear Parking Lamps |
| 18 | Locks |
| 19 | Blank |
| 20 | Sunroof |
| 21 | Lock |
| 22 | Retained Accessory Power |
| 23 | Blank |
| 24 | Unlock |
| 25 | Blank |
| 26 | Blank |
| 27 | OH Battery/OnStarĀ® System |
| 28 | Sunroof |
| 29 | Rainsenseā¢ Wipers |
| 30 | Parking Lamps |
| 31 | Truck Body Controller 4 CruiseĀ Control |
| 32 | Truck Body Controller 5 |
| 33 | Front Wipers |
| 34 | Vehicle Stop |
| 35 | Blank |
| 36 | Heat Ventilation Air Conditioning B |
| 37 | Front Parking Lamps |
| 38 | Left Turn Signal |
| 39 | Heat Ventilation Air Conditioning 1 |
| 40 | Truck Body Controller 4 |
| 41 | Radio |
| 42 | Trailer Park |
| 43 | Right Turn Signal |
| 44 | Heat Ventilation Air Conditioning |
| 45 | Rear Fog Lamps |
| 46 | Auxiliary Power 1 |
| 47 | Ignition 0 |
| 48 | Four-Wheel Drive |
| 49 | Blank |
| 50 | Truck Body Controller Ignition |
| 51 | Brakes |
| 52 | Truck Body Controller Run |
WARNING:Ā Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
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