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 instrument panel (I/P) backlighting based on the postion 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 85 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 1: The scan tool displays the battery system voltage received by the module.

Battery 2: The scan tool displays the battery system voltage received by the module.

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

Dimming Input: The scan tool displays the voltage value indicating the position of the I/P dimmer switch (thumbwheel). The scan tool displays 4 volts when the headlamp switch is in the AUTO position and the 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.

Dimming Level: The scan tool displays the duty cycle of the PWM signal distributed by the BCM to the interior lighting circuits. The scan tool displays 0 percent when the interior lamps illumination is OFF. The scan tool displays 100 percent when the interior lamp illumination is at full intensity.

Dimming Potentiometer: The scan tool displays the duty cycle of the PWM signal distributed by the BCM to the PWM controlled door switch backlighting based on the postion of the I/P dimmer switch (Thumbwheel). The scan tool displays 0 percent when the headlamp switch is in the AUTO position and the DRL are ON or the I/P dimmer switch is in the FULL DIM position. The scan tool displays 100 percent when either the headlamps or park lamps are activated and the I/P dimmer switch is in the FULL BRIGHT position.

Indicator Dimming: The scan tool displays the duty cycle of the PWM signal distributed by the BCM to the PWM controlled I/P backlighting based on the postion of the I/P dimmer switch (Thumbwheel). The scan tool displays 1.2 percent when the headlamp switch is in the AUTO position and the DRL are ON or the I/P dimmer switch is in the FULL DIM position. The scan tool displays 100 percent when either the headlamps or park lamps are activated 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.

Low Beam Duty Cycle: On a vehicle equipped with the standard headlamp system, the scan tool displays the duty cycle percentage of the PWM ground signal controlling the headlamp driver module (HDM). The BCM uses this feature to signal the HDM to operate the low beam headlamps in low beam headlamp mode at full intensity (100 percent) or in DRL mode at a reduced intensity (81 percent).

Memory Switch Backlight: The scan tool displays the duty cycle of the PWM signal distributed by the BCM to the PWM controlled memory switch backlight based on the postion of the I/P dimmer switch (Thumbwheel). The scan tool displays 0 percent when the headlamp switch is in the AUTO position and the DRL are ON or the I/P dimmer switch is in the FULL DIM position. The scan tool displays 35 percent when either the headlamps or park lamps are activated and the I/P dimmer switch is in the FULL BRIGHT position.

Mirror Switch Backlight: The scan tool displays the duty cycle of the PWM signal distributed by the BCM to the PWM controlled mirror switch backlight based on the postion of the I/P dimmer switch (Thumbwheel). The scan tool displays 2 percent when the headlamp switch is in the AUTO position and the DRL are ON or the I/P dimmer switch is in the FULL DIM position. The scan tool displays 25 percent when either the headlamps or park lamps are activated and the I/P dimmer switch is in the FULL BRIGHT position.

Window Switch Backlight: The scan tool displays the duty cycle of the PWM signal distributed by the BCM to the PWM controlled window switch backlight based on the postion of the I/P dimmer switch (Thumbwheel). The scan tool displays 0 percent when the headlamp switch is in the AUTO position and the DRL are ON or the I/P dimmer switch is in the FULL DIM position. The scan tool displays 100 percent when either the headlamps or park lamps are activated and the I/P dimmer switch is in the FULL BRIGHT position.

Inputs

Courtesy Lamp Switch: The scan tool displays the position of the courtesy lamp switch. The scan tool displays Active when the switch is turned ON. The BCM uses this data in controlling the operation of the courtesy lamps.

Dimming Enabled: The scan tool displays if the dimming feature of the module is enabled or disabled. The scan tool displays On when the dimming feature of the module is enabled.

Door Ajar Switch: The scan tool displays Off when the applicable door is fully closed or On when the door is open or ajar.

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 On when the front fog lamp switch is activated with the park lamps or low beam headlamps ON.

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 3: The scan tool displays the position of the ignition switch. The scan tool displays On when the ignition switch is in the RUN position only.

Inadvertant 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.

Interior Lamp Defeat Switch: The scan tool displays the position of the courtesy/dome lamp override switch. The scan tool displays On when the switch is activated requesting the BCM to override the normal interior lamp activation inputs and deactivate the interior lighting.

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.

Left Rear Door Ajar Switch: The scan tool displays Off when the left rear door is fully closed or On when the left rear door is open or ajar.

Liftgate Ajar Switch: The scan tool displays Closed when the liftgate is fully closed or Ajar when the liftgate is open or ajar.

Liftglass Ajar Switch: The scan tool displays Closed when the liftglass is fully closed or Ajar when the liftglass is open or ajar.

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 parklamp switch. The scan tool displays Active when the park lamp switch is in the ON position. The BCM uses this data in controlling the operation of the park lamps.

Right Rear Door Ajar Switch: The scan tool displays Off when the right rear door is fully closed or On when the right rear door is open or ajar.

Outputs

DRL Relay: On a vehicle equipped with the high intensity discharge (HID) headlamp system, the scan tool displays the state of the DRL relay that is internal to the turn signal/hazard flasher module. The scan tool displays On when the BCM has signaled the turn signal/hazard flasher module to activate the RF and LF turn signals at a steady rate for DRL operation.

Output Control

Backup Lamps: The scan tool displays the commanded state of the BCM which directly supplies battery positive voltage to the backup lamps. The scan tool displays On when the BCM activates the backup lamps upon receiving a backup lamp request signal from the backup lamp switch.

Dimming Level: The scan tool displays the duty cycle of the PWM signal distributed by the BCM to the interior lighting circuits. The scan tool displays 0 percent when the interior lamps illumination is OFF. The scan tool displays 100 percent when the interior lamp illumination is at full intensity.

High Beams: 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.

Inadvertant 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.

Low Beam Duty Cycle: On a vehicle equipped with the standard headlamp system, the scan tool displays the commanded state of the headlamp driver module. The BCM displays 100 percent for the low beam headlamps in low beam headlamp mode at full intensity or 81 percent in the DRL mode resulting with a reduced intensity.

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.