Data

Backlight Dimming: The scan tool displays the duty cycle of the pulse width modulated (PWM) signal distributed by the body control module (BCM) to the PWM controlled I/P backlighting based on the position of the I/P dimmer switch, thumbwheel. The scan tool displays 0 percent when the headlamp switch is in the AUTO position and the daytime running lamps (DRL) are ON or the I/P dimmer switch is in the FULL DIM position. The scan tool displays approximately 95 percent when either the low beam headlamps or park lamps are activated and the I/P dimmer switch is in the FULL BRIGHT position.

Battery Voltage: The scan tool displays the battery system voltage received by the module.

Dimming Input: The scan tool displays the voltage value indicating the position of the instrument panel (I/P) dimmer switch, thumbwheel. The scan tool displays 4 volts when the headlamp switch is in the AUTO position and the daytime running lamps (DRL) are ON or the I/P dimmer switch is in the FULL DIM position. The scan tool displays 0 volts when either the park lamps or the headlamps are turned ON and the I/P dimmer switch is in the FULL BRIGHT position.

Light Sensor: The scan tool displays the output voltage of the ambient light sensor based on the intensity of light detected. As the light intensity increases, the sensor displayed voltage decreases. In the LIGHT state, a low voltage, not less than 1.75 volts, is present and the DRL will be ON. In the DARK state, a high voltage, up to 4.9 volts, is present and the headlamps will be ON.

Inputs

Backup Light Request: 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.: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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.: 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.

Outputs

Backup Lamps: The scan tool displays the commanded state of the backup lamps. The scan tool displays On when the BCM applies voltage to operate the backup lamps.

Daytime Running Lamps: The scan tool displays the commanded state of the daytime running lamps (DRL). The scan tool displays ON when the BCM allows the DRL relay to activate the DRL.

High Beam Relay: The scan tool displays the commanded state of the high beam relay. The scan tool displays On when the BCM allows the high beam relay to go to ground activating the high beam headlamps.

Low Beam Output: The scan tool displays the commanded state of the low beam relay. The scan tool displays ON when the BCM allows the high beam relay to go to activate the low beam headlamps.

Park Lamp Relay: The scan tool displays the commanded state of the park lamp relay. The scan tool displays ON when the BCM allows the park lamp relay to activate the park lamps.

Output Control

Backup Lamps: The scan tool displays the commanded state of the backup lamps. The scan tool displays On when the BCM illuminates the backup lamps.

High Beams: The scan tool displays the commanded state of the high beam headlamp relay. The scan tool displays On when the BCM allows the high beam headlamp relay to go to ground to activate the high beam headlamps.

Inadvertent Power Relay: The scan tool displays the commanded state of the inadvertent power relay. The scan tool displays On when the BCM allows the inadvertent power relay to go to ground to provide voltage to the interior lamps.

Low Beam Duty Cycle: The scan tool displays the commanded state of the low beam headlamp relay. The scan tool displays 100% when the BCM allows the low beam headlamp relay to go to ground to activate the low beam headlamps.

Park Lamp Relay: The scan tool displays the commanded state of the park lamp relay. The scan tool displays On when the BCM allows the park lamp relay to go to ground to activate the park lamps.