Headlamp Switch: Operation
WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
The headlamp switch closes a path to ground for the Central Timer Module (CTM) when the park or head lamps are on and the driver door ajar switch is closed. The headlamp switch opens the ground path when the headlamp switch is turned off. The ground path is also opened when the driver door ajar switch is open.
The headlamp switch cannot be repaired and, if faulty or damaged, it must be replaced. (Refer to REMOVAL ) for the service procedures.