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.
Scan Tool Data Definitions: Outputs
Backup Lamp Relay:Β The scan tool displays ON/OFF. This output of the BCM is displayed as ON when the backup lamps are turned on.
Front Fog Lamp Relay:Β The scan tool displays ON/OFF. This output of the BCM is displayed as ON when the fog lamps are turned on.
Headlamps:Β The scan tool displays ON/OFF. This output of the BCM is displayed as ON, if the BCM commands the headlamps ON.
Inadvertent Power Output:Β The scan tool displays OFF or ON. When the BCM is not commanding the inadvertent power On, the scan tool will display Off. When the BCM is commanding the inadvertent power ON, the scan tool will display ON.
Left Turn Signal:Β The scan tool displays ON/OFF. This output of the BCM is displayed as ON, if the turn signal switch is activated in the turn left position.
Park Lamps:Β The scan tool displays Off or On. When the BCM is not commanding the park lamp relay On, the scan tool will display Off. When the BCM is commanding the park lamp relay On, the scan tool will display On.
Right Turn Signal:Β The scan tool displays ON/OFF. This output of the BCM is displayed as ON, if the turn signal switch is activated in the turn right position.
Theater Dimming #1:Β The scan tool displays OFF or On. When the BCM is not commanding the theater dimming ON, the scan tool displays OFF. When the BCM is commanding the theater dimming ON the scan tool displays 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:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.