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
Battery Voltage: The scan tool displays 0- 25.5 volts. The state of the battery voltage supplied to the body control module (BCM).
Door Jamb Switch: The scan tool displays Open/Closed. The door jamb switch input to the BCM, where an open passenger door is displayed as Open.
Door Lock Output: The scan tool displays On/Off. The BCM output to the door lock actuators, where Lock is displayed as On.
Door Lock Switch: The scan tool displays Active/Inactive. The driver or passenger door lock switch input to the BCM, where a switch in Lock position is displayed as Active.
Door Unlock Output: The scan tool displays On/Off. The BCM output to the passenger door lock actuators, where Unlock is displayed as On.
Door Unlock Switch: The scan tool displays Active/Inactive. The driver or passenger door lock switch input to the BCM, where a switch in the Unlock position is displayed as Active.
Driver Door Switch: The scan tool displays Open/Closed. The driver door switch input to the BCM, where an open driver door is displayed as Open.
Driver Unlock Output: The scan tool displays On/Off. The BCM output to the driver door lock actuator, where Unlock is displayed as On.
Software Part Number: The scan tool displays the 8 digit part number of the BCM.
Trunk Ajar Switch: The scan tool displays On/Off. The trunk ajar switch input to the BCM, where an open trunk is displayed as 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.