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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 666 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL OUTPUT CONTROLS
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Scan Tool Output Controls
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Scan Tool Output Controls
WARNING: This page is about a different car, the 2006 GMC Sierra, 2006 GMC Cab & Chassis Sierra, 2006 Chevrolet Silverado, and 2006 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Body Control Module (BCM)
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Light Test | Daytime Running Lamps | The BCM activates the DRL relay when there is sufficient light to the ambient light sensor and you select ON. The daytime running lights will remain illuminated until commanded OFF. |
| Light Test | Parking Lamps | The BCM activates the park lamp relay when you select ON. The park lamps illuminate until commanded OFF. |
| Light Test | Backup Lamps | The BCM illuminates the backup lamps when you select ON. The backup lamps will remain ON until commanded OFF. |
| Lamp Dimming Test | Dimming | The BCM adjusts the dimming output level when you select the percentage of illumination desired. The dimmable I/P lamps will illuminate to the level set by the scan tool when the I/P dimmer switch is in the FULL DIM position. |
| Inadvertent Power | The BCM deactivates the inadvertent power circuit when you select OFF. The inadvertent power circuit will remain inactive for approximately 5 seconds. |
Driver Door Module (DDM)/Passenger Door Module (PDM)
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Puddle Lamps | - | The DDM activates the exterior courtesy lamps when you select ON. The exterior courtesy lamps will remain illuminated until commanded OFF. |
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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.