Vision V6-3.5L VIN F (1997)
Dimmer Switch: Description and Operation
Ultralight Sensor
GENERAL INFORMATION
Ultralight System
The Ultralight system turns the instrumentation and exterior illumination lamps ON when the ambient light levels are low and OFF when light
levels are high. Ultralight is controlled by the Body Control Module (BCM). With the headlamp switch in the AUTO position, the BCM will
control the headlamp, parking, side marker, tail and instrumentation lamps based on ambient light levels. Ambient light levels are monitored by the
BCM using the automatic temperature control system Sunload Sensor, located on the top of the instrument panel cover. Ambient light readings are
averaged to limit cycling the lamps - ON and OFF when passing through areas with varying light levels. Ultralight will only function when the
engine is running. When the headlamp switch is in the AUTO position (Ultralight mode), the Headlamp Time Delay system will function when the
ignition is switched OFF.
