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 DATA LIST
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Scan Tool Data List
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Scan Tool Data List
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 Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine OFF/Vehicle in PARK/Park brake RELEASED/Headlamps in AUTO/All doors/tailgate closed | |||
| Backlight Dimming | Data | Percent | Varies |
| Backup Lamps | Output | On/Off | Off |
| Backup Light Request | Input | Active/Inactive | Inactive |
| Battery Voltage | Data | Volts | Varies |
| Cargo Door Ajar Switch | Input | Open/Closed | Closed |
| Cargo Lamp Switch | Input | On/Off | Off |
| Courtesy Lamp Relay | Input | On/Off | Off |
| Courtesy Lamp Switch | Input | Active/Inactive | Inactive |
| Daytime Running Lamps | Output | Active/Inactive | Varies |
| Dimming Input | Data | Volts | Varies |
| Dimming Level | Data | Percent | 0% |
| Dimming Potentiometer | Data | Volt | Varies |
| Driver Door Ajar Switch | Input | On/Off | Off |
| DRL Disable Switch | Input | Active/Inactive | Inactive |
| Flash to Pass Switch | Input | On/Off | Off |
| Front Fog Lamp Switch | Input | Active/Inactive | Inactive |
| Front Wiper Active | Input | Yes/No | No |
| Headlamp Switch | Input | Active/Inactive | Inactive |
| High Beam Relay | Output | On/Off | Off |
| High Beam Switch | Input | On/Off | Off |
| Ignition 0 | Input | On/Off | On |
| Ignition 1 | Input | On/Off | On |
| Ignition Accessory | Input | Active/Inactive | Active |
| Inadvertent Power Relay | Input | On/Off | On |
| Indicator Dimming | Data | Percent | Varies |
| Interior Lamp Defeat Switch | Input | On/Off | On/Off |
| Interior Lamp Output | Output | On/Off | Off |
| Key In Ignition | Input | Yes/No | Yes |
| Left Rear/Rear Cargo Door Ajar Switch | Input | On/Off | Off |
| Light Sensor | Data | Volts | 1.75 Volts Maximum Light to 4.9 Volts Maximum Dark |
| Low Beam Output | Output | On/Off | Off |
| Man. Trans. Reverse Sw. | Input | On/Off | Off |
| Park Lamp Relay | Output | On/Off | On/Off |
| Park Lamp Switch | Input | Active/Inactive | Inactive |
| Passenger Door Ajar Switch | Input | On/Off | Off |
| Rear Fog Lamp Relay | Input | On/Off | Off |
| Right Rear Door Ajar Switch | Input | On/Off | Off |
Driver Door Module (DDM)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine OFF/Vehicle in PARK/Park brake RELEASED/Headlamps in AUTO/All doors/tailgate closed | |||
| Dimming Enable | Input | On/Off | On |
| Dimming Potentiometer | Data | Percent | Varies |
| Door Ajar Switch | Input | On/Off | Off |
| Memory Switch Backlight | Data | Percent | Varies |
| Puddle Lamp Output | Output | Active/Inactive | Inactive |
| Window Switch Backlight | Data | Percent | Varies |
Passenger Door Module (PDM)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine OFF/Vehicle in PARK/Park brake RELEASED/Headlamps in AUTO/All doors/tailgate closed | |||
| Backlight Dimming Enable | Output | Yes/No | Yes |
| Dimming Enable | Input | On/Off | On |
| Dimming Potentiometer | Data | Percent | Varies |
| Puddle Lamp Output | Output | On/Off | Off |
Instrument Panel Cluster Module (IPC)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine OFF/Vehicle in PARK/Park brake RELEASED/Headlamps in AUTO/All doors/tailgate closed | |||
| Cargo Lamp On | Input/Output | On/Off | Off |
| Display Dimming | Input/Output | Percent | Varies |
| High Beam Lamp | Input/Output | On/Off | Off |
| Left Turn Input | Input/Output | Open/Closed | Open |
| Right Turn Input | Input/Output | Open/Closed | Open |
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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.