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 609 (LIGHTING SYSTEMS)
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Section 609 (Lighting Systems)
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Section 609 (Lighting Systems)
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. 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 Data List
- Scan Tool Data Definitions
- Diagnostic Trouble Code (DTC) List
- DTC B1482: BCM Commanded State Does Not Match The Feedback
- DTC B2533: Fog Lamp Enable Circuit Active With Short To Battery Voltage
- DTC B2552 (Regal Only): Backup Lamp Relay Control Circuit Short To Ground Or Open
- DTC B2553 (Regal Only): Short To Battery In Backup Lamp Relay Control Circuit
- DTC B2559: Courtesy Lamp Ground Circuit
- DTC B2577: Short To Ground Or Open In Headlamp Relay Control Circuit
- DTC B2578: Short To Battery In Headlamp Relay Control Circuit
- DTC B2587: Short To Ground Or Open In Park Lamp Relay Control Circuit
- DTC B2588: Short To Battery In Park Lamp Relay Control Circuit
- DTC B2603: Short To Battery In LF Turn Signal Lamp Supply Voltage/Signal Circuit
- DTC B2608: Short To Battery In RF Turn Signal Lamp Supply Voltage/Signal Circuit
- DTC B2617: Courtesy Lamp Low Control Circuit Low
- DTC B2618: Courtesy Lamp Low Control Circuit High
- DTC B2647: Short To Ground In DRL Ambient Light Sensor Signal Circuit
- DTC B2648: Ambient Light Sensor Signal Circuit Open Or Shorted To Voltage
- Symptoms - Lighting Systems
- Backup Lamps Always On (Regal)
- Backup Lamps Always On (Century)
- Backup Lamps Inoperative (Regal)
- Backup Lamps Inoperative (Century)
- Cornering Lamps Always On
- Cornering Lamps Inoperative
- Courtesy Lamps Always On
- Courtesy Lamps Inoperative
- Daytime Running Lamps (DRL) Inoperative
- Fog Lamp Indicator Inoperative
- Fog Lamps Always On
- Fog Lamps Inoperative
- Hazard Lamps Inoperative
- Headlamps Always On - Low or High Beam
- Headlamps Inoperative - Low Beams
- Headlamps Inoperative - High Beams
- Headlamps Inoperative - Low and High Beams
- Headlamps Inoperative - Flash to Pass
- Headlamps Inoperative in Low Light Conditions
- High Beam Indicator Inoperative
- Illuminated Entry Lamps Inoperative
- Interior Backlighting Does Not Dim
- Interior Backlighting Inoperative
- IP Compartment Lamp Inoperative
- IP Compartment Lamp Always On
- Park Lamps Always On
- Park Lamps Inoperative
- Park Lamps Inoperative in Low Light Conditions
- Reading Lamp(s) Always On
- Reading Lamp(s) Inoperative
- Rear Compartment Lamp(s) Inoperative
- Rearview Mirror Lamp(s) Inoperative - Inside
- Stop Lamps Always On
- Stop Lamps Inoperative
- Turn Signal Lamps and/or Indicators Always On or Flashing
- Turn Signal Lamps and/or Indicators Inoperative
- Vanity Mirror Lamp(s) Always On
- Vanity Mirror Lamp(s) Inoperative
- Repair Instructions
- Headlamp Switch Replacement
- Fog Lamp Switch Replacement - Front
- Daytime Running Lamps (DRL) Ambient Light Sensor Replacement
- Hazard and Turn Signal Flasher Replacement
- Ashtray Lamp Bulb Replacement
- Console Lamp Replacement (Bulb)
- Console Lamp Replacement (Switch)
- Courtesy Lamp/Reflector Replacement - Door
- Courtesy Lamp Replacement - Instrument Panel
- IP Compartment Lamp Switch Replacement
- IP Compartment Lamp Bulb Replacement
- Vanity Mirror Lamp Replacement
- Trans Floor Shift Control Indicator Lamp Replacement
- Dome Lamp Replacement
- Dome Lamp Bulb 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
- High Mounted Stop Lamp Bulb Replacement
- Backup Lamp Replacement
- License Lamp Bulb Replacement
- Tail Lamp Assembly and /or Backup, Sidemarker, Stop, Turn Signal Bulb Replacement
- Roof Side Rail Lamp Replacement
- Rear Compartment Lamp Replacement
- Front Bumper Fascia Deflector Replacement - Side
- Compartment Lid Applique Replacement - Rear
- Description and Operation
- Exterior Lighting Systems Description and Operation
- Exterior Lamps
- Headlamps
- Flash to Pass
- Daytime Running Lamps (DRL)
- Automatic Headlamps and Park Lamps
- Delayed Headlamp Control
- Park Brake Input
- Fog Lamps
- Turn Signal Lamps
- Hazard Lamps
- Cornering Lamps
- Park, Tail, Sidemarker, and Rear License Lamps
- Stop Lamps
- Backup Lamps (Century)
- Backup Lamps (Regal)
- Lighting System Indicator(s)
- Driver Controls and Modules
- Interior Lighting Systems Description and Operation
- Interior Lighting
- Interior Lamps
- Interior Lamps Features
- Courtesy/Illuminated Entry Lamps
- Courtesy/Illuminated Exit
- Inadvertent Power Feature
- Theater Dimming
- Courtesy Lamps Manual Operation
- Dome Lamp
- IP Compartment Lamp
- IP Courtesy Lamp
- Inside Rear View Mirror Lamp
- Rear Compartment Lamp
- Roof Rail Courtesy Lamps
- Sunshade Mirror Lamps
- Underhood Compartment Lamp
- Interior Lamps Dimming
- Driver Controls and Modules
- Exterior Lighting Systems Description and Operation
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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.