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 MANUALSCHEVROLET2002AVALANCHE 2500, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTEXTERIOR LIGHTSLIGHTING SYSTEMS
2002 Chevrolet Avalanche 2500, RWD
Lighting Systems
2002 Chevrolet Avalanche 2500, RWDSECTION Lighting Systems
- Specifications
- Schematic & Routing Diagrams
- Component Locator
- Diagnostic Information & 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 B1397: 5 Volt Reference Output Circuit Voltage Low
- DTC B1398: 5 Volt Reference Output Circuit Voltage High
- DTC B1480: Inadvertent Power Relay Voltage
- DTC B2527: Front Fog Lamp Switch Signal Circuit Shorted To Ground
- DTC B2577: Headlamp Relay Coil Supply Voltage Circuit Shorted To Ground
- DTC B2585: Short To Ground In Interior Park Lamps Supply Voltage Circuit
- DTC B2613: Instrument Panel Lamp Supply Voltage Circuit Shorted To Battery Voltage
- DTC B2617: Courtesy Lamp Relay Coil Control Circuit Open Or Shorted To Ground
- DTC B2618: Courtesy Lamp Relay Coil Control Circuit Open Or Shorted To Ground
- DTC B2642: Ground Illumination Relay Control Circuit Open Or Shorted To Ground
- DTC B2643: Ground Illumination Relay Control Circuit Shorted To Battery Voltage
- DTC B2647: Ambient Light Sensor Signal Circuit Open Or Shorted To Ground
- DTC B2648: Ambient Light Sensor Signal Shorted To Battery
- Symptoms - Lighting Systems
- Backup Lamp Always On
- Backup Lamps Inoperative
- Clearance Lamps Inoperative
- Courtesy Lamps Always On (Without RPO Y91)
- Courtesy Lamps Always On (With RPO Y91)
- Courtesy Lamps Inoperative (Without RPO Y91)
- Courtesy Lamps Inoperative (With RPO Y91)
- Daytime Running Lamps (DRL) Always On
- Daytime Running Lamps (DRL) Inoperative
- Daytime Running Lamps (DRL) On With Park Brake Applied
- Exterior Courtesy Lamp(s) Always On
- Exterior Courtesy Lamp(s) Inoperative
- Fog Lamp Indicator Inoperative (Front)
- Fog Lamp Indicator Inoperative (Export, Rear)
- Fog Lamps Always On (Front)
- Fog Lamps Always On (Export, Rear)
- Fog Lamps Inoperative (Front)
- Fog Lamps Inoperative (Export, Rear, Utility)
- Hazard Lamps Inoperative
- 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
- Headlamps On In Daylight Conditions
- Headlight Leveling Inoperative
- High Beam Indicator Always On
- High Beam Indicator Inoperative
- Interior Backlighting Does Not Dim
- Interior Backlighting Inoperative
- IP Compartment Lamp Inoperative
- Park Lamps Inoperative
- Reading Lamp(s) Inoperative
- Stop Lamps Always On
- Stop Lamps Inoperative
- Turn Signal Lamps &/Or Indicators Always On Or Flashing
- Turn Signal Lamps &/Or Indicators Inoperative
- Underhood Lamp Inoperative
- Vanity Mirror Lamp(s) Always On
- Vanity Mirror Lamp(s) Inoperative
- Repair Instructions
- Headlamp Switch Replacement
- Headlamp Leveling Switch Replacement
- Lamp Switch Assembly Replacement - Front Fog Lamp and Cargo Lamp
- Fog Lamp Switch Replacement - Rear
- Ambient Light Sensor Replacement
- Lamp Control Module Replacement
- Daytime Running Lamps (DRL) Relay Replacement
- Hazard and Turn Signal Flasher Replacement
- Courtesy Lamp Replacement - Exterior
- Console Lamp Replacement
- Courtesy Lamp/Reflector Replacement - Door
- IP Compartment Lamp Replacement
- Ashtray Lamp Replacement
- Dome Lamp Replacement
- Underhood Lamp Replacement
- Headlamp Assembly or Headlamp Bulb Replacement (Except Avalanche)
- Headlamp Assembly or Headlamp Bulb Replacement (Avalanche)
- Headlamp Assembly or Headlamp Bulb Replacement (Escalade)
- Headlamp Aiming (Cadillac)
- Headlamp Aiming (Except Cadillac)
- Fog Lamp Replacement - Front (Except Z71)
- Fog Lamp Replacement - Front (Z71)
- Fog Lamp Bulb Replacement - Front
- Fog Lamp Replacement - Rear
- Fog Lamp Bulb Replacement - Rear
- Daytime Running and Fog Lamp Assembly Replacement (Avalanche)
- Fog Lamp Aiming Procedure
- Park/Turn Signal Lamp Replacement (Except Avalanche)
- Park/Turn Signal Lamp Replacement (Avalanche)
- High Mounted Stop Lamp Replacement (Utilities)
- High Mounted Stop Lamp Replacement (Escalade)
- High Mounted Stop Lamp Replacement (Escalade EXT)
- High Mounted Stop Lamp Replacement (Avalanche)
- License Lamp Replacement (W/ Step Bumper)
- License Lamp Replacement (Escalade EXT)
- Tail/Turn Signal Lamp Replacement
- Description and Operation
- Special Tools and Equipment
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.