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 MANUALSCHEVROLET2012CHEVY EXPRESS G2500, VAN PASSENGER, 4.8L ENG VIN AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1340 (VEHICLE DIAGNOSTIC INFORMATION - SCAN TOOL INFORMATION)SPECIFICATIONSAUXILIARY BODY CONTROL MODULE SCAN TOOL INFORMATION
2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN A
Auxiliary Body Control Module Scan Tool Information
2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN ASECTION Auxiliary Body Control Module Scan Tool Information
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Auxiliary Body Control Module
| Parameter | System State | Expected Value | Description |
|---|---|---|---|
| Operating Conditions: Ignition in the ON position, bright light applied to the ambient light sensor, park brake not set, headlamp switch in the OFF position, dome lamp switch in the OFF position, fog lamp switch in the OFF position, all doors closed, and trailer harness disconnected. | |||
| Battery Voltage | - | Varies | The scan tool displays Volts. This is the battery voltage input to the auxiliary BCM. |
| Inclination Sensor Status | - | Off | The scan tool displays Off, Awake, Valid, Active, Invalid. This is the state of the inclination sensor. |
| Rear Fog Lamp Relay Cmd. | - | Off | The scan tool displays ON/OFF. When the rear fog lamp switch is placed in the ON position and rear fog lamp relay activation is requested, the scan tool will display ON. |
| Rear Fog Lamp Switch | - | Inactive | The scan tool displays Inactive/Active. When the rear fog lamp switch is placed in the ON position, the scan tool will display Active. |
| Trailer Left Bulb Out Signal | - | 0 Counts | The scan tool displays counts. When the XBCM detects that a trailer is connected and that a left trailer bulb is inoperative, the scan tool will display 0 counts. When the XBCM detects that a trailer is connected and that a left trailer bulb is operative, the scan tool will display 255 counts. |
| Trailer Right Bulb Out Signal | - | 0 Counts | The scan tool displays counts. When the XBCM detects that a trailer is connected and that a right trailer bulb is inoperative, the scan tool will display 0 counts. When the XBCM detects that a trailer is connected and that a right trailer bulb is operative, the scan tool will display 255 counts. |
| Trailer Detection Input | - | Off | The scan tool displays ON/OFF. When a trailer is connected to the vehicle and a voltage signal is received through the trailer harness to the XBCM, the scan tool will display ON. |
| Trailer Fog Lamp Relay Cmd. | - | Off | The scan tool displays ON/OFF. When the rear fog lamp switch is placed in the ON position and trailer rear fog lamp relay activation is requested, the scan tool will display ON. |
Auxiliary Body Control Module Scan Tool Output Controls
| Output Control | Additional Menu Selections | Description |
|---|---|---|
| Rear Fog Lamps | Output Controls | The auxiliary body control module activates the rear fog lamps when you select ON. The rear fog lamps illuminate until commanded OFF. |
| Trailer Fog Lamps | Output Controls | The auxiliary body control module activates the trailer fog lamps circuit when you select ON. The trailer fog lamps circuit remains energized 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.