Section 766 (Lighting Systems)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. 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 (PTC) List
- DTC B0951: Headlamp ON Indicator Control Circuit Open, Shorted To Ground, Or Shorted To Voltage
- DTC B1480: Inadvertent Power Supply Voltage Circuit Is Shorted To Ground
- DTC B2527: Front Fog Lamp Switch Signal Circuit Is Shorted To Ground
- DTC B2530: Front Fog Lamp Relay Control Circuit
- DTC B2540: Rear Fog Lamp Relay Control Circuit
- DTC B2550: Backup Lamp Supply Voltage Circuit
- DTC B2575: Headlamp Low Beam Relay Control Circuit
- DTC B2580: High Beam Headlamp Relay Control Circuit
- DTC B2585: Park Lamp Relay Control Circuit
- DTC B2600: DRL Relay Control Circuit
- DTC B2610: Instrument Panel Lamps Dimming Control Circuit
- DTC B2615: Courtesy Lamp Supply Voltage Circuit
- DTC B2620: I/P Dimmer Switch Circuit
- DTC B2625: Instrument Panel Lamps Dimming Control Circuit
- DTC B2645: Ambient Light Sensor Signal Voltage
- DTC B3801: Instrument Panel Dimmer Switch Signal
- DTC B3802: Headlamp Switch
- Symptoms - Lighting Systems
- Backup Lamps Always On
- Backup Lamps Inoperative
- Cargo Lamp Always On
- Cargo Lamp Inoperative
- Clearance Lamps Inoperative
- Courtesy Lamps Always On
- Courtesy Lamps Inoperative
- Daytime Running Lamps (DRL) Always On
- Daytime Running Lamps (DRL) Inoperative
- Exterior Courtesy Lamp(s) Always On
- Exterior Courtesy Lamp(s) Inoperative
- Fog Lamp Indicator Inoperative
- Fog Lamp Indicator Inoperative - Rear
- Fog Lamps Always On
- Fog Lamps Inoperative
- Fog Lamps Always On - Rear
- Fog Lamps Inoperative - Rear
- Hazard Lamps Always On
- Hazard Lamps Inoperative
- Headlamp Switch On Indicator Always On
- Headlamp Switch On Indicator Inoperative
- Headlamps Always On - Low or High Beam
- Headlamps Inoperative - High Beams
- Headlamps Inoperative - Low Beams (Except Escalade)
- Headlamps Inoperative - Low Beams (Escalade)
- Headlamps Inoperative - Low and High Beams
- Headlamps Inoperative - Flash to Pass
- Headlight Leveling Inoperative
- High Beam Indicator Always On
- High Beam Indicator Inoperative
- Interior Backlighting Does Not Dim
- Interior Backlighting Inoperative
- Instrument Panel (I/P) Compartment Lamp Inoperative
- Instrument Panel (I/P) Compartment Lamp Always On
- Park, License, and Tail Lamps Always On
- Park, License, and Tail Lamps Inoperative
- Reading Lamp(s) Inoperative
- 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) Inoperative
- Repair Instructions
- Stop Lamp Switch Replacement
- 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
- Courtesy Lamp Replacement - Exterior
- Courtesy Lamp/Reflector Replacement - Door
- Instrument Panel (I/P) Compartment Lamp Switch Replacement
- Dome Lamp Replacement
- Underhood Lamp Replacement
- HID Headlamp Starter/Arc Tube Replacement
- Headlamp Assembly or Headlamp Bulb Replacement (Except Avalanche)
- Headlamp Assembly or Headlamp Bulb Replacement (Avalanche)
- Headlamp Assembly or Headlamp Bulb Replacement (Cadillac)
- Headlamp Assembly or Headlamp Bulb Replacement (HID)
- Headlamp Aiming (Cadillac)
- Headlamp Aiming (Except Cadillac)
- Headlamp Aiming Procedure
- Fog Lamp Replacement - Front (Except Z71)
- Fog Lamp Replacement - Front (Z-71)
- Fog Lamp Bulb Replacement - Front (Old Style)
- Fog Lamp Replacement - Rear
- Fog Lamp Bulb Replacement - Rear
- Daytime Running and Fog Lamp Assembly Replacement (Avalanche)
- Fog Lamp Aiming Procedure
- Marker Lamp Replacement - Front Side
- Marker Lamp Replacement - Rear Side
- Park/Turn Signal Lamp Replacement (Except Avalanche)
- Park/Turn Signal Lamp Replacement (Avalanche)
- High Mounted Stop Lamp Replacement (Utility)
- High Mounted Stop Lamp Replacement (Cadillac)
- High Mounted Stop Lamp Replacement (Escalade EXT)
- High Mounted Stop Lamp Replacement (Avalanche)
- License Lamp Replacement (W/Step Bumper)
- Tail/Turn Signal Lamp Replacement
- Description and Operation
- Exterior Lighting Systems Description and Operation
- Exterior Lamps
- Notes
- Headlamps
- High Beams
- Low Beams (Except Escalade with High Intensity Discharge (HID))
- Low Beams (Escalade w/HID)
- Low Voltage Operation of HID Headlamps
- Electrical System Requirements with HID
- Run Up Of The HID Lamp
- When To Change The HID Bulb
- Light Color (w/HID)
- Daytime Running Lamps (DRL)
- Fog Lamps
- Park, Tail and Marker Lamps
- Exterior Courtesy Lamps
- Turn Signal/Hazard Lamps
- Stop Lamps
- Backup Lamps
- Clearance Lamps
- Exterior Lamps
- Interior Lighting Systems Description and Operation
- Exterior Lighting Systems Description and Operation
- Special Tools and Equipment