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 MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1679 (LIGHTING SYSTEMS)
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Section 1679 (Lighting Systems)
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Section 1679 (Lighting Systems)
WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- 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 List
- Scan Tool Data Definitions
- Diagnostic Trouble Code (DTC) List
- DTC B1482: Inadvertent Power Supply Circuit Is Open Or Shorted To Ground
- DTC B2532: Fog Lamp Relay Control Circuit Is Open Or Shorted To Ground
- DTC B2533: Fog Lamp Relay Control Circuit Is Shorted To Battery Positive Voltage
- DTC B2600: DRL Resistor Supply Voltage Circuit Is Open
- DTC B2602: DRL Relay Control Circuit Shorted To Ground
- DTC B2603: Headlamp Feedback Is Not Present
- DTC B2622: Dimmer Switch Signal Is Open Or Shorted To Ground, Or Dimmer Switch Signal Return Is Open Or Shorted To Ground
- DTC B2623: Dimmer Switch Signal Is Open Or Shorted To Voltage, Or Dimmer Switch Signal Return Is Open Or Shorted To Voltage
- DTC B2627: Instrument Panel Dimming Lamps Output Is Open Or Shorted To Ground
- DTC B2628: Instrument Panel Dimming Lamps Output Is Shorted To Voltage
- DTC B2662: Park Lamp Input Is Inactive
- DTC B2743: Short To Voltage In The Front Fog Lamp Supply Voltage Circuit
- DTC P0504: Stop Lamp Switch Input And Cruise/Brake Switch Input Mismatch
- Symptoms - Lighting Systems
- Backup Lamps Always On
- Backup Lamps Inoperative
- Courtesy Lamps Always On
- Courtesy Lamps Inoperative
- Daytime Running Lamps (DRL) Indicator Inoperative
- Daytime Running Lamps (DRL) Inoperative
- Dome Lamps Inoperative
- Fog Lamps Always On
- Fog Lamps Inoperative
- Hazard Lamps Inoperative
- Headlamps Inoperative - High Beams
- Headlamps Inoperative - Low Beams
- Headlamps Inoperative - Low and High Beams
- Headlamps Inoperative - Flash to Pass
- High Beam Indicator Inoperative
- Illuminated Entry Lamps Inoperative
- Park Lamps Always On
- Park Lamps Inoperative
- Stop Lamps Inoperative
- Turn Signal Lamps and/or Indicators Inoperative
- Repair Instructions
- Stop Lamp Switch Adjustment
- Stop Lamp Switch Replacement
- Fog Lamp Switch Replacement - Front
- Door Jamb Switch Replacement - Front
- Instrument Panel (I/P) Dimmer Switch Replacement
- Ambient Light Sensor Replacement
- Hazard and Turn Signal Flasher Replacement
- Reading Lamp Bulb Replacement
- Reading Lamp Replacement
- Trans Floor Shift Control Indicator Lamp Replacement
- Dome Lamp Replacement
- Headlamp Assembly or Headlamp Bulb and/or Cornering, Sidemarker, Park, Turn Signal Bulb Replacement
- Headlamp Aiming
- Fog Lamp Replacement - Front
- Fog Lamp Bulb Replacement - Front
- Fog Lamp Aiming Procedure
- Marker Lamp Replacement - Side
- Marker Lamp Bulb Replacement - Side
- High Mounted Stop Lamp Replacement
- High Mounted Stop Lamp Bulb Replacement
- Cargo Lamp Replacement
- Cargo Lamp Bulb Replacement
- License Lamp Replacement
- License Lamp Bulb Replacement
- Tail Lamp Assembly and/or Backup, Sidemarker, Stop, Turn Signal Bulb Replacement
- Rear Liftgate Lamp Replacement
- Dome Lamp Bulb Replacement
- Description and Operation
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.