Headlights

Each headlamps is individually fused so that battery voltage is applied to the individual lamps at all times through circuit 1640 for the LH headlamps and through circuit 1740 for the RH headlamps. When the headlamp switch is in HEAD, the ground is applied directly to headlamp dimmer switch through circuit 1750. When the headlamp dimmer switch is placed in LOW, the ground is applied to low beam lamps through circuit 1201. When the headlamp dimmer switch is placed in high, the ground is applied to the high beam lamps and high beam indicator through circuit 1200. The high beam indicator is fused so that the battery voltage is applied at all times through circuit 640.

Day/night mode sensing: The BCM determines the ambient light operating mode from the Daytime Running Lamp (DRL) control module. Then it communicates this information to the Instrument Panel Cluster (IPC) and Powertrain Control Module (PCM) via the class 2 serial data link.

Twilight sentinel control: The BCM turns on the headlamps at night for 90 seconds when the ignition switch is turned from RUN to LOCK or OFF while the headlamps are on due to night mode of the auto headlamp control.