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
8 Digit GM Part Number: The scan tool displays the 8 digit BCM part number for service identification.
Electronics Battery Fd: The scan tool displays 0.0-25.5 volts. Electronics Battery Fd represents the system voltage measured by the BCM at its battery feed input.
Ignition 0 (Data): The scan tool displays 0.0-25.5 volts. The Ignition 0 voltage represents the system voltage measured at the BCM Ignition 0 feed input.
Ignition 0 (Inputs): The scan tool displays Active/Inactive. The scan tool displays Active when the ignition switch is in ACCY or RUN positions.
Ignition 1: The scan tool displays Active/Inactive. The scan tool displays Active when the ignition switch is in RUN or START positions.
Ignition Accessory: The scan tool displays Active/Inactive. The scan tool displays Active when the ignition switch is in ACCY or RUN positions.
Key In Ignition: The scan tool displays Active/Inactive. The scan tool displays Active when the ignition key is inserted into the ignition switch.
Park/Neutral Switch: The scan tool displays Active/Inactive. The scan tool displays Active when the shift lever is in the Park or Neutral positions.
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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.