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.
2007 Chevrolet Chevy Express G3500, Van Cargo Extended, 6.6 6FACTORY OEM SERVICE PROCEDURE
Lighting Systems
- Specifications
- Schematic and Routing Diagrams
- Component Locator
- Lighting Systems Component Views
- Lighting Systems Connectors
- Backup Lamp - Left (Passenger/Cargo)
- Backup Lamp - Right (Passenger/Cargo)
- Center High Mounted Stop Lamp (CHMSL) (Passenger/Cargo)
- Courtesy/Reading Lamp - Front
- Courtesy/Reading Lamp - Middle (Passenger)
- Courtesy/Reading Lamp - Rear (Passenger)
- Dome Fluorescent Work Lamps (PNP w/UF2)
- Dome Fluorescent Work Lamp Relay (PNP w/UF2)
- Dome Lamp - Rear (Cargo)
- Door Jamb Switch - Left Rear Side (E26)
- Door Jamb Switch - Right Rear Side (Passenger/Cargo)
- Door Latch Assembly - Cargo - C1
- Door Latch Assembly - Driver - C1
- Door Latch Assembly - Passenger - C1
- Fog Lamp - LR (T79)
- Fog Lamp - RR (T79)
- Headlamp - High Beam - Left (Composite)
- Headlamp - High Beam - Right (Composite)
- Headlamp - Left (Sealed)
- Headlamp - Low Beam - Left (Composite)
- Headlamp - Low Beam - Right (Composite)
- Headlamp - Right (Sealed)
- Headlamp and Panel Dimmer Switch - C1
- Headlamp and Panel Dimmer Switch - C2
- License Lamp (Passenger/Cargo)
- Marker Lamp - Left Front
- Marker Lamp - Right Front
- Park/Turn Signal Lamp - Left Front
- Park/Turn Signal Lamp - Right Front
- Stop Lamp Switch
- Tail/Stop and Turn Signal Lamp - Left (Passenger/Cargo)
- Tail/Stop and Turn Signal Lamp - Right (Passenger/Cargo)
- Trailer Stop/Turn Relay - Left (UY7)
- Trailer Stop/Turn Relay - Right (UY7)
- Turn Signal/Hazard Flasher Module
- Turn Signal/Multifunction Switch - C1
- Turn Signal/Multifunction Switch - C2
- Turn Signal/Multifunction Switch - C3
- Turn Signal/Multifunction Switch - C4
- Underhood Lamp
- Vanity Mirror Lamp - Left (DH6)
- Vanity Mirror Lamp - Right (DH6)
- Diagnostic Information and Procedures
- Diagnostic Code Index
- Diagnostic Starting Point - Lighting Systems
- Scan Tool Output Controls
- Scan Tool Data List
- Scan Tool Data Definitions
- DTC B0951
- DTC B1480
- DTC B2575
- DTC B2580
- DTC B2585
- DTC B2600
- DTC B2610
- DTC B2615 (With YF7)
- DTC B2615 (Without YF7)
- DTC B2620
- DTC B2625
- DTC B3801
- DTC B3802
- Symptoms - Lighting Systems
- Backup Lamps Always On
- Backup Lamps Inoperative
- Courtesy Lamps Always On
- Courtesy Lamps Inoperative
- Daytime Running Lamps (DRL) Defeat Inoperative
- Daytime Running Lamps (DRL) Inoperative
- Dome Lamps Always On
- Dome Lamps Inoperative
- Rear Fog Lamp Indicator Inoperative
- Rear Fog Lamps Always On
- Rear Fog Lamps Inoperative
- Hazard Lamps Always On
- Hazard Lamps Inoperative
- Headlamp Low or High Beams Always On
- Headlamps Inoperative - High Beams
- Headlamps Inoperative - Low Beams
- Low and High Beams Headlamps Inoperative
- Headlamps Flash to Pass Inoperative
- High Beam Indicator Always On
- High Beam Indicator Inoperative
- Interior Backlighting Does Not Dim
- Interior Backlighting Inoperative
- 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
- Underhood Lamp Inoperative
- Vanity Mirror Lamp(s) Inoperative
- Repair Instructions
- Stop Lamp Switch Replacement
- Headlamp Switch Replacement
- Rear Fog Lamp Switch Replacement
- Hazard and Turn Signal Flasher Replacement
- Vanity Mirror Lamp Bulb Replacement
- Dome Lamp Replacement
- Dome Lamp Bulb Replacement
- Underhood Lamp Replacement
- Sealed Beam Headlamp Replacement
- Headlamp Bulb Replacement
- Headlamp Capsule Replacement
- Headlamp Aiming
- Rear Fog Lamp Replacement
- Rear Fog Lamp Bulb Replacement
- Front Position Lamp Replacement
- Repeater Lamp Replacement
- Front Side Marker Lamp Replacement (RPO T90)
- Front Side Marker Lamp Replacement (RPO X88/Z88)
- Park/Turn Signal Lamp Replacement (Base Vehicles)
- Park/Turn Signal Lamp Replacement (Uplevel Vehicles)
- High Mount Stop Lamp Replacement
- Cargo Lamp Replacement
- Backup Lamp Replacement
- Backup Lamp Bulb Replacement
- Tail Lamp Replacement
- Description and Operation
- Special Tools and Equipment
Factory Service Tools
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.
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