Headlamp Operation
WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
The low beam headlamps may be turned ON in 3 different ways:
- When the headlamp switch in the HEAD position for normal operations
- When the headlamp switch is in the AUTO position, for automatic lamp control (ALC)
- When the headlamp switch is placed in the AUTO position, with the windshield wipers ON in daylight conditions, after a 6 second delay
Headlamps ON/OFF operation is determined by the position of the headlamp switch and controlled by the body control module (BCM). When the headlamp switch is in the AUTO position, the BCM determines headlamps ON/OFF by the voltage signal from the ambient light sensor.