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
- Backup Light Request
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The scan tool displays the class 2 message sent by the powertrain control module (PCM) to the BCM requesting backup lamp operation. The scan tool displays INACTIVE when the gear selector is in any position other than REVERSE and ACTIVE when in the REVERSE position. The BCM uses this data in controlling the operation of the backup lamps.
- Driver Door Ajar Sw.
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The scan tool displays the position of the driver door ajar switch. The scan tool displays Off when the door is closed and ON when the door is open or ajar. The BCM uses this data in controlling the operation of the courtesy lamps, door ajar warning, and power roof operation.
- Flash to Pass Switch
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The scan tool displays the position of the flash to pass switch. The scan tool displays On when the switch is pulled to activate the high beams momentarily while the switch is held.
- Front Fog Lamp Switch
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The scan tool displays the position of the front fog lamp switch. The scan tool displays ACTIVE or INACTIVE when the switch is depressed. The BCM uses this data in controlling the operation of the front fog lamps.
- Front Wipers Active
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The scan tool displays the state of the wiper motor. The scan tool displays Yes when the wipers are in operation after approximately the first 3 cycles of the wiper blades.
- Headlamp Switch
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The scan tool displays the position of the headlamp switch. The scan tool displays Active when the headlamp switch is in the ON position. The BCM uses this data in controlling the operation of the headlamps.
- High Beam Switch
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The scan tool displays the position of the high beam switch. The scan tool displays On when the switch is used to activate the high beams.
- Ignition 0
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The scan tool displays the position of the ignition switch. The scan tool displays On when the ignition switch is in the RUN or CRANK position.
- Ignition 1
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The scan tool displays the position of the ignition switch. The scan tool displays On when the ignition switch is in the RUN or CRANK position.
- Ignition Accessory
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The scan tool displays the position of the ignition switch. The scan tool displays Active when the ignition switch is in the ACCY or IGN positions.
- Inadvertent Power Relay
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The scan tool displays the state of the inadvertent power battery rundown protection feature of the BCM. The scan tool displays Off when all inadvertent power circuits are functioning normally.
- Key in Ignition
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The scan tool displays Yes when the key has been inserted into the ignition switch. The scan tool displays No after the key has been removed.
- Park Brake Switch
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The scan tool displays the position of the park brake pedal. The scan tool displays Set when the park brake is engaged closing the switch. The BCM uses this data in controlling the operation of the park brake indicator, the reminder chime feature and the DRL system.
- Park Lamp Switch
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The scan tool displays the position of the park lamp switch. The scan tool displays ON when the park lamp switch is in the ON position. The BCM uses this data in controlling the operation of the park lamps.
- Passenger Door Ajar Sw.
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The scan tool displays the position of the passenger door ajar switch. The scan tool displays Off when the door is closed and ON when the door is open or ajar. The BCM uses this data in controlling the operation of the courtesy lamps, door ajar warning, and power roof operation.
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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.