Commander 4WD V8-4.7L VIN N (2006)
Headlamp Alignment Switch: Description and Operation
HEADLAMP LEVELING SWITCH
DESCRIPTION
The headlamp leveling switch (2) is used only on vehicles manufactured for certain markets where the headlamp leveling system is required. The
headlamp leveling switch is integral to the upper switch pod (1) on the instrument panel. Only the switch bezel and slider are visible on the outer surface
of the switch pod bezel. The switch pod bezel is marked with the numbers "0," "1," "2," and "3" above the switch slider, which indicates each of the
four switch detent positions. Each higher number represents a lower aiming position of the headlamp beam relative to the road surface.
The black, molded plastic switch pod housing encloses the switch slider mechanism and the leveling switch circuitry including the switch contacts and a
series resistor configuration. A connector receptacle is integral to the back of the switch pod housing. The switch is connected to the vehicle electrical
system through a dedicated take out and connector of the instrument panel wire harness.
The headlamp leveling switch cannot be adjusted or repaired and, if faulty or damaged, the entire upper switch pod unit must be replaced.
OPERATION
The headlamp leveling switch receives battery voltage on a fused park lamp relay output circuit whenever the park lamp relay is 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.