Dark State

The following actions occur is the headlamp switch is set to the AUTO, PARK LAMP or HEADLAMP position:
^ The DRLs are OFF.
^ The park lamps are ON.
^ The headlamps are ON.
^ If you toggle the HIGH/LOW beam switch, the HIGH/LOW beams will toggle.

The following conditions exist if the ignition switch is in the OFF position and the park brake is set:
^ The DRLs are OFF.
^ The park lamps are OFF.
^ The headlamps are OFF.

If you turn the ignition switch to the RUN position, the auto headlamps are defeated. If you release the park brake, the auto headlamps will function. If you set the park brake again, the headlamp function will not change;

If the headlamp switch is in the AUTO position and the ambient light level conditions change to LIGHT for 20 seconds, the BCM will turn OFF the headlamps