Liberty 4WD L4-2.8L DSL Turbo VIN 5 (2006)
Headlamp Alignment Switch: Description and Operation
HEADLAMP LEVELING SWITCH
DESCRIPTION
The headlamp leveling switch (1) is used only on vehicles manufactured for certain markets where the headlamp leveling system is required. The
headlamp leveling switch is mounted in the driver side inboard trim bezel on the instrument panel. Only the switch bezel and thumbwheel (5) are visible
on the outer surface of the instrument panel trim bezel. The black plastic switch thumbwheel is marked with white numbers "0," "1," "2," and "3," each
of which indicates one 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 housing encloses the switch thumbwheel mechanism and the leveling switch circuitry including the switch contacts and
a series resistor configuration. A connector receptacle (3) is integral to the back of the switch housing, while a single integral latch feature (2) on the top
of the housing and two latch features (4) on the bottom of the housing secure the switch in the instrument panel trim bezel. 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 inoperative or damaged, the unit must be replaced.
OPERATION
The headlamp leveling switch receives battery voltage on a fused park lamp relay output circuit from a fuse in the Junction Block (JB) whenever the park
lamps relay is energized (the park lamps are turned On). The switch receives a path to ground through a splice block in the instrument panel wire harness
secured by a nut to a ground stud on the driver side instrument panel end bracket near the JB.
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.
