Optical Horn/High Beam

When the multi-function switch is pulled to the first detent (optical horn) with the headlamps ON and the key-in the ignition, the BCM shall send a message via PCI bus to the IPM to turn on the headlamps drivers to illuminate all four filaments (Low and High beams). When the multi-function switch is pulled to the second detent (high beam) signal and the headlamps are ON, the BCM shall send a message via PCI bus to the IPM to turn on the headlamps drivers. The High Beams and Low Beams are illuminated and the Fog Lamps (if ON) are extinguished. If the headlamps were in the high beam configuration when power was removed from the headlamps, the headlamps will be configured as low beam the next time they are activated.