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: Inputs
Courtesy Ground: The scan tool displays Present/Not Present. The input of the courtesy ground is displayed as Not Present when the ground for the courtesy lamps is not detected.
Courtesy Switch: The scan tool displays ON/OFF. The input of the courtesy switch is displayed as ON when the courtesy lamps are command ON.
Headlamp Switch: The scan tool displays inactive or active. When the autolamp switch is in the OFF position, the scan tool will display inactive. When the autolamp switch is in the ON position, the scan tool will display active.
Inadvert. Power Output: The scan tool displays ON/OFF. This output of the BCM is displayed as ON when the Inadvert. power output is present.
LCM lights on Chime: The scan tool displays ON/OFF. The input of the LCM Lights on chime is displayed as ON when the headlamps switch is ON with the ignition off and the key removed.
Lt. Turning Signal Sw.: The scan tool displays Inactive/Active. The input of the Lt. Turning Signal Sw. is displayed as active if the turn signal switch is activated in the turn left position.
Park Brake Switch: The scan tool displays inactive or active. When the park brake is OFF, the scan tool will display inactive. When the park brake is applied, the scan tool will display active.
Rt. Turning Signal Sw.: The scan tool displays Inactive/Active. The input of the Rt. Turning Signal Sw. is displayed as active if the turn signal switch is activated in the turn right position.
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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.