Description
Headlights on vehicles equipped with twilight sentinel system are controlled by a Lamp Control Module (LCM), Daytime Running Lights (DRL) Module, or Central Control Module (CCM). An ambient light sensor (photocell), mounted to top of instrument panel or under left defroster grille, is used to sense light levels. When headlights are turned on, or photocell senses darkness, input to control module is grounded, and module applies power to exterior lighting circuits.
Operation
System operates automatically whenever ignition is on, headlights are off, and twilight sentinel system is on. When turned on, system automatically turns on exterior lights at dusk. At dawn, system will turn exterior lights off.
System provides a 30-second delay before switching lights on or off, thus preventing system from operating under sudden ambient lighting changes, such as passing through tunnels or exposure to bright lights at night.
See also:
• COMPUTER RELEARN PROCEDURES