GMC Sonoma (2003 – 2004) – fuse and relay box diagram
Year of production: 2003, 2004
This article covers the second-generation GMC Sonoma, produced from 1994 to 2004. It includes fuse box diagrams for the 2003 and 2004 models, provides details on the locations of the fuse panels within the vehicle, and explains the layout and function of each fuse and relay.
Passenger Compartment
Fuse box location
The instrument panel fuse block is at the driver’s end of the instrument panel.
Fuse box diagram
Assignment of the fuses in the passenger compartment
| Fuse/Circuit Breaker | Usage |
| A | Not Used |
| B | Not Used |
| 1 | Not Used |
| 2 | Cigarette Lighter, Data Link Connector |
| 3 | Cruise Control, Body Controls TBC, Cruise Module, Cruise Switch |
| 4 | Gages, Body Controls TBC, Instrument Panel Cluster, B+ Power |
| 5 | Parking Lamps, Power Window Switch, TBC, Ashtray Lamp |
| 6 | Not Used |
| 7 | Headlamp Switch, Body Controls TBC, Headlamp Relay |
| 8 | Courtesy Lamps, Inadvertent Power Relay |
| 9 | HVAC Control Head |
| 10 | Turn Signal |
| 11 | Instrument Panel Cluster, Engine Controls |
| 12 | Interior Illumination |
| 13 | Auxiliary Power |
| 14 | Power Locks |
| 15 | 4WD Switch, Engine Control (VCM, PCM, Transmission) |
| 16 | Supplemental Inflatable Restraint |
| 17 | Front Wiper |
| 18 | Not Used |
| 19 | Radio Battery |
| 20 | Not Used |
| 21 | HVAC I, HVAC Control Head, HVAC Devices |
| 22 | Anti-Lock Brakes |
| 23 | Rear Wiper |
| 24 | Radio, Ignition |
Engine Compartment
Fuse box location
The fuse block is under the hood on the driver’s side of the engine compartment.
Fuse box diagram
Assignment of the fuses in the engine compartment
| Name | Usage |
| TRL TRN | Trailer Left Turn |
| TRR TRN | Trailer Right Turn |
| TRL B/U | Trailer Back Up Lamps |
| VEH B/U | Vehicle Back-Up Lamps |
| HDLP PWR | Headlamp Power |
| RT TURN | Right Turn Signal Front |
| LT TURN | Left Turn Signal Front |
| HDLP W/W | Not Used |
| LT TRN | Left Turn Signal Rear |
| RT TRN | Right Turn Signal Rear |
| RR PRK | Right Rear Parking Lamps |
| TRL PRK | Trailer Park Lamps |
| LT HDLP | Left Headlamp |
| RT HDLP | Right Headlamp |
| FRPRK | Front Parking Lamps |
| INT BAT | Instrument Panel Fuse Block Feed |
| ENG I | Engine Sensors/Solenoids, MAF, CAM, PURGE, VENT |
| ECM B | Engine Control Module, Fuel Pump Module, Oil Pressure |
| ABS | Anti-Lock Brake System |
| ECM I | Engine Control Module Injectors |
| F/PUMP | Fuel Pump |
| DRL | Daytime Running Lamps |
| A/C | Air Conditioning |
| HORN | Horn |
| BTSI | Automatic Transmission Shift Lock Control System |
| B/U LP | Back Up Lamps |
| IGN B | Column Feed, IGN 2, 3, 4 |
| STARTER | Starter |
| RAP | Retained Accessory Power |
| LD LEV | Not Used |
| OXYSEN | Oxygen Sensor |
| IGN E | Engine |
| MIR/LKS | Mirrors, Door Locks |
| FOG LP | Fog Lamps |
| IGN A | Starting and Charging Ignition 1 |
| STUD #2 | Accessory Feeds, Electric Brake |
| PARKLP | Parking Lamps |
| LR PRK | Left Rear Parking Lamps |
| LIFTGLASS | Liftglass |
| IGN C | Starter Solenoid, Fuel Pump, PRNDL |
| HTDSEAT | Heated Seat |
| HVAC | Heating,Ventilation, Air Cooling System |
| TRCHMSL | Trailer Center High Mount Stop Light |
| RRDFOG | Rear Defogger |
| TBC | Truck Body Computer |
| CRANK | Clutch Switch, NSBU Switch |
| CHMSL | Center High Mounted Stoplamp |
| HAZLP | Hazard Lamps |
| VECHMSL | Vehicle Center High-Mounted Stop Lamp |
| RR DEFOG | Rear Defogger |
| HTDMIR | Heated Mirrors |
| ATC | Transfer Case (Four-Wheel Drive) |
| STOPLP | Stoplamps |
| RR W/W | Rear Window Wiper |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
