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
Ambient Light Sensor: The scan tool displays 0.0 to 5.0 volts, depending on light intensity.
Backup Lamp Relay: The scan tool displays Inactive/Active. This output of the BCM is displayed as active when the backup lamps are turned on.
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.
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.
Driver Door Switch: The scan tool displays OPEN/CLOSED. The input of the driver door switch is displayed as OPEN when the driver door is open.
Door Jamb Switch: The scan tool displays OPEN/CLOSED. The input of the door jamb switch is displayed as OPEN when the any door is open.
Front Fog Lamp Relay: The scan tool displays ON/OFF. This output of the BCM is displayed as ON when the fog lamps are turned on.
Headlamp Switch: The scan tool displays Inactive/Active. The input of the Headlamp switch is displayed as active when the headlamp lamps are command ON.
Headlamps: The scan tool displays ON/OFF. This output of the BCM is displayed as ON, if the BCM commands the headlamps ON.
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.
Left Turn Signal: The scan tool displays ON/OFF. This output of the BCM is displayed as ON, when the left front turn signal flashes or the DRL are activated.
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.
LT Turning Signal Sw.: The scan tool displays ON/OFF. The input of the LT Turning Signal Sw. is displayed as ON if the turn signal switch is activated in the turn right position.
Park Brake Indicator Switch: The scan tool displays ON/OFF. The input of the park brake indicator switch is displayed as ON when the park brake is ON.
Park Lamps: The scan tool displays ON/OFF. This output of the BCM is displayed as ON, if the BCM commands the parklamps ON.
Right Turn Signal: The scan tool displays ON/OFF. This output of the BCM is displayed as ON when the right front turn signal flashes or the DRL are activated.
RT Turning Signal Sw.: The scan tool displays ON/OFF. The input of the RT Turning Signal Sw. is displayed as ON if the turn signal switch is activated in the turn right position.
Theater Dimming #1: The scan tool displays ON/OFF. This output of the BCM is displayed as ON, if the BCM commands the courtesy lamps 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.