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 735 (LIGHTING SYSTEMS)
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Section 735 (Lighting Systems)
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Section 735 (Lighting Systems)
WARNING: This page is about a different car, the 2002 Chevrolet Malibu. 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
- Notes
- DRL Relay
- DRL Relay Feedback
- Park Lamp Input
- Low Beam Feedback
- High Beam Feedback
- Fog Lamp Switch
- Fog Lamp Relay
- Fog Lamp Relay Feedback
- Interior Dim Pot
- Interior Lamp Output
- Interior Lamp Feedback
- Driver Door Ajar Switch
- Passenger Door Ajar Switch
- Inadvert. Power Output
- Inadvert. Power Feedback
- Rear Compartment Lamp On
- Diagnostic Trouble Code (DTC) List
- 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 B2558: Interior Lamp Control Circuit Is Shorted To Battery Positive Voltage
- DTC B2575: ALC Headlamp Relay Control Circuit Is Open
- DTC B2577: ALC Headlamp Relay Control Circuit Open/Shorted To Ground
- DTC B2578: ALC Headlamp Relay Control Circuit Is Shorted To Voltage
- DTC B2585: Park Lamp Relay Control Circuit Is Open Or Shorted To Battery Voltage, Or Park Lamp Relay Output Circuit Is Open, Shorted To Ground Or Battery Voltage
- DTC B2587: Park Lamp Relay Control Circuit Is Shorted To Ground Or Open
- DTC B2588: Park Lamp Relay Control Circuit Is Shorted To Battery Positive Voltage
- DTC B2600: DRL Relay Or Headlamp Power
- DTC B2601: DRLs Remain Illuminated Without Being Commanded On
- DTC B2602: DRL Relay Control Circuit Shorted To Ground
- DTC B2603: DRL Relay Control Circuit Shorted To Battery Positive Voltage
- DTC B2647: Ambient Light Sensor Signal Reference Circuit Open Or Shorted
- DTC B2648: Ambient Light Sensor Signal Reference Circuit Is Shorted To Battery
- Symptoms - Lighting Systems
- Automatic Lamp Control Inoperative
- Backup Lamps Always On
- Backup Lamps Inoperative
- Courtesy Lamps Always On
- Courtesy Lamps Inoperative
- Daytime Running Lamps (DRL) Inoperative
- Dome Lamps 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
- High Beam Indicator Inoperative
- Illuminated Entry Lamps Inoperative
- IP Compartment Lamp Inoperative
- Park Lamps Inoperative
- Reading Lamp(s) Inoperative
- Rear Compartment Lamp(s) Inoperative
- Stop Lamps Inoperative
- Turn Signal Lamps and/or Indicators Inoperative
- Vanity Mirror Lamp(s) Inoperative
- Repair Instructions
- Fog Lamp Switch Replacement - Front
- Hazard Warning Switch Replacement - On Vehicle
- IP Dimmer Switch Replacement
- Module Replacement - Panel Dimming
- Ambient Light Sensor Replacement
- Fog Lamp Relay Replacement
- Hazard and Turn Signal Flasher Replacement
- Dome and Reading Lamp Bulb Replacement
- IP Lamp Replacement
- Courtesy Lamp Replacement - Instrument Panel
- IP Compartment Lamp Switch Replacement
- Vanity Mirror 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 Aiming Procedure
- Marker Lamp Replacement - Front Side
- High Mounted Stop Lamp Replacement (Rear Package Shelf)
- High Mounted Stop Lamp Replacement (Spoiler Mounted)
- License Lamp Replacement
- Tail Lamp Assembly and/or Backup, Sidemarker, Stop, Turn Signal Bulb Replacement
- Rear Compartment Lamp 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.