Headlamp Leveling Switch: Operation

The headlamp leveling switch receives battery voltage on a park lamp output circuit whenever the park lamps are energized (the park lamps are turned On). The switch receives a path to ground at all times through the instrument panel wire harness. The only output from the switch is a voltage signal that it provides to the headlamp leveling motors on a headlamp adjust signal circuit. Each switch position selects a different tap on a series resistor within the switch to provide a different voltage signal to the leveling motors. The higher the switch position number, the higher the output voltage level.

The headlamp leveling switch can be tested using conventional diagnostic tools and methods. For further diagnosis and testing, use a diagnostic scan tool and the appropriate diagnostic information.