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
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Scan Tool Data Definitions
Body Control Module (BCM)
Battery Voltage
- Display indicates battery voltage. Measured in volts.
Brake Applied Output Signal
- Displays ON/OFF status of the brake pedal switch.
Ignition 1 Signal
- Display indicates ON when the ignition 1 input circuit of the module receives a battery signal from the ignition switch.
Remote Start
- Display indicates the current status of the remote start request.
Shift Lock Solenoid Command:
- Displays indicate OFF when the brake switch is depressed on Column Shift.
Shifter Unlock Command
- Displays indicates ON when the brake switch is depressed on Floor Shift.
Engine Control Module (ECM)
Current Gear
- Displays current gear position of the transmission
TCC Brake Switch
- Displays ON or OFF status of the TCC Brake switch.
TR Sw. A/B/C/P
- Displays LOW or HI for the state of each of the four inputs from the IMS. LOW displayed indicates a low voltage signal (0 volts) being monitored at the ECM. HI displayed indicates a high voltage signal (B+) being monitored at the ECM.
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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.