Without Fog Lights (SSE & SSEi)

The Light Control Module automatically turns on the Headlights and Exterior Lights when it is dark outside, The Module keeps the lights on for a selected amount of time after the Ignition Switch has been turned to OFF.
When the Ignition Switch is in RUN and the Light Control Module senses darkness, the Module's Headlight Control closes, applying voltage to the Headlights through the Headlight Dimmer Switch. The Module's Exterior Lights Control also closes, applying voltage to the Front and Rear Marker Lights, Park Lights, License Plate Lamps and Tail Lights.

On/Off Input

When the Twilight Sentinel Control is placed in the ON position, the Module automatically turns on the Headlights and Exterior Lights when it gets dark. On T61 equipped vehicles, the Daytime Running Lights operation is not affected by the Twilight Sentinel Control's position.

Photocell Input

The Twilight Sentinel/Daytime Running Lights Photocell is a variable resistor. Its resistance decreases as outside light intensity increases. The Light Control Module measures the voltage across the Photocell to determine whether it is day or night.

Delay Input

When the Ignition Switch is turned to OFF, the Module keeps the lights on at night for at least five seconds and not more than 4 1/2 minutes. The resistance of the rheostat in the Twilight Sentinel Control sets the delay period.

Daytime Running Lights

On vehicles equipped with Daytime Running Lights, the Light Control Module has an additional function: it turns on the Lo Beam Headlights at a reduced brilliance in daylight conditions.

Park Input

The Daytime Running Lights mode is disabled when the battery voltage is applied to the Module's Park Input (terminal C2/B8). This occurs anytime the gear selector lever is placed in park.

Adaptive Lamp Monitor Module

The Adaptive Lamp Monitor Module monitors each lighting circuit by looking at voltage across internal resistors in each monitored lighting circuit. If the voltage drop across one of these resistors decreases by a certain percentage, the Adaptive Lamp Monitor Module recognizes this as a lamp outage and communicates this information over the serial data line to the Driver Information Center (DIC). The DIC then displays an outage and sounds a slow chime for 5 seconds.
The Adaptive Lamp Monitor Module is adaptive because it may be used in vehicles with various lighting configurations. This module recognizes and adapts to a particular lighting configuration when the ignition switch is in run and the park lights are turned on. The module must relearn the vehicle lighting configuration if the battery is disconnected.