Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC2003SONOMA 2D PICKUP, 4.3 X, AUTOMATICREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTHEADLIGHTSLIGHTING SYSTEMS
2003 GMC Sonoma 2D Pickup, 4.3 X, Automatic
Lighting Systems
2003 GMC Sonoma 2D Pickup, 4.3 X, AutomaticSECTION Lighting Systems
- Specifications
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Lighting Systems
- Diagnostic System Check - Lighting Systems
- Scan Tool Output Controls
- Scan Tool Data Definitions
- DTC B1397: 5 Volt Reference Output Circuit Voltage Low
- DTC B1398: 5 Volt Reference Output Circuit Voltage High
- DTC B1480: Inadvertent Power Relay Control Circuit
- DTC B2527: Front Fog Lamp Switch Signal Circuit Is Shorted To Ground
- DTC B2537: Rear Fog Lamp Switch Signal Circuit Is Shorted To Ground
- DTC B2577: Headlamp Relay Coil Supply Voltage Circuit Shorted To Ground
- DTC B2585: Short To Ground In Interior Park Lamps Fused Supply Voltage Circuit Or An Open In Park Lamp Relay Control Circuit
- DTC B2600: Dimmer Switch High Beam Signal Circuit
- DTC B2613: Voltage 2 Circuit Is Shorted To Battery Voltage
- DTC B2617: Courtesy Lamp Relay Coil Control Circuit Is Open Or Shorted To Ground
- DTC B2618: Courtesy Lamp Relay Coil Control Circuit Is Shorted To Battery Voltage
- DTC B2647: Ambient Light Sensor Input Voltage Voltage Low, Or Courtesy Lamp Relay Coil Control Circuit Open Or Shorted To Ground
- DTC B2648: Ambient Light Sensor Input Voltage High, Or Courtesy Lamp Relay Coil Control Circuit Shorted To Battery
- Symptoms - Lighting Systems
- Repair Instructions
- Stop Lamp Switch Replacement
- Headlamp Switch Replacement
- Door Jamb Switch Replacement - Front
- Door Jamb Switch Replacement - Rear
- Daytime Running Lamps (DRL) Ambient Light Sensor Replacement
- Hazard and Turn Signal Flasher Replacement
- Console Lamp Replacement
- Instrument Panel (I/P) Lamp Replacement
- Courtesy Lamp Replacement - Instrument Panel (Lower)
- Ashtray Lamp Replacement
- Rearview Mirror Lamp Replacement
- Vanity Mirror Lamp Replacement
- Dome Lamp Replacement (Pickup)
- Dome Lamp Replacement (Utility)
- Dome Lamp Bulb Replacement (Without Sunroof)
- Dome Lamp Bulb Replacement (With Sunroof)
- Headlamp Assembly or Headlamp Bulb and/or Cornering, Sidemarker, Park, Turn Signal Bulb Replacement
- Headlamp Motor/Actuator Replacement
- Headlamp Aiming
- Front Fog Lamp - Park/Turn Signal Assembly Replacement
- Fog Lamp Replacement - Front (Xtreme)
- Fog Lamp Replacement - Rear
- Fog Lamp Aiming Procedure
- High Mounted Stop Lamp Replacement (Utility - Endgate Window)
- High Mounted Stop Lamp Replacement (Utility - Roof Mounted)
- High Mounted Stop Lamp Replacement (Pickup)
- Cargo Lamp Replacement
- License Lamp Replacement (w/ Step Bumper)
- License Lamp Replacement (w/o Step Bumper)
- License Lamp Replacement (Filler Panel)
- Tail Lamp Assembly and/or Backup, Sidemarker, Stop, Turn Signal Bulb Replacement (Pickup)
- Tail Lamp Assembly and /or Backup, Sidemarker, Stop, Turn Signal Bulb Replacement (Utility)
- Description and Operation
- Special Tools and Equipment
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.