Circuit/System Description

With the headlight switch in the HEADLAMP or PARKLAMP position, the appropriate headlamp switch signal circuit is grounded through the headlight switch. The body control module (BCM) then sends a serial data message to the instrument cluster requesting the instrument cluster to illuminate the lights on indicator. With the turn signal/multifunction switch in the HIGH BEAM or FLASH TO PASS position the appropriate turn signal/multifunction switch signal circuit is grounded through the turn signal/multifunction switch. The BCM then sends a serial data message to the instrument cluster requesting the instrument cluster to illuminate the high beam indicator. The BCM will also request the instrument cluster to turn on the lights on indicator located in the driver information center anytime the headlamps are ON and the ignition is OFF or the driver door is opened.