Lighting System Indicator(S)

HIGH BEAM
The IPC illuminates the high beam indicator when the Body Control Module (BCM) detects that the high beams are requested. The BCM divides the voltage present on the headlamp high beam signal circuit by the system voltage in order to determine a percentage value. The value is compared against a calibration in order to determine if the high beams are on. The IPC receives a class 2 message from the BCM requesting illumination.

TURN SIGNALS
The right and left turn signal indicators are hard wired to the turn signal switch and hazard switch. The turn signal indicator illuminates when the turn signal lamps supply voltage circuit is active. The body control module is also hard wired to the turn signal switch. If the BCM determines that the turn signal flasher signal circuit is active for more than 1.2 km (0.75 mi), the BCM sends a class 2 message to the radio in order to activate an audible warning.

DAYTIME RUNNING LAMPS
The IPC day time running lamp indicator illuminates when any of the following occur:
^ The vehicle is in motion with the headlamps off and the park brake unapplied.
^ The park brake is on and vehicle speed has exceeded a certain level.