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.
Export Body Control Module (XBCM) Data Display
- Battery Voltage
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The scan tool displays the battery voltage input to the XBCM.
- Rear Fog Lamp Relay Command
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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
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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
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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
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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
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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 Command
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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.
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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.