Section 640 (Lighting Systems)
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- 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