SWITCH-HEADLAMP LEVELING
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 ineffective 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 as well as the hard wired inputs and outputs of the switch may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information.
REMOVAL
WARNING: To avoid personal injury or death, on vehicles equipped with airbags, disable the supplemental restraint system before attempting any steering wheel, steering column, airbag, occupant classification system, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the supplemental restraint system. Failure to take the proper precautions could result in accidental airbag deployment.
NOTE: A headlamp leveling switch is used only on vehicles manufactured for certain markets where headlamp leveling is required.
1. Disconnect and isolate the battery negative cable.
2. Remove the driver side inboard bezel (4) from the instrument panel. (Refer to 23 - BODY/INSTRUMENT PANEL/INSTRUMENT PANEL DRIVER SIDE BEZEL - REMOVAL).
3. Disconnect the instrument panel wire harness connector from the headlamp leveling switch connector receptacle (3).
4. From the back of the trim bezel, depress the two lower latch features (5) on the switch housing and rock the bottom of the switch out through the face of the bezel.
5. From the back of the trim bezel, depress the upper latch feature (2) on the switch housing and push the switch (1) out through the face of the bezel.
INSTALLATION
WARNING: To avoid personal injury or death, on vehicles equipped with airbags, disable the supplemental restraint system before attempting any steering wheel, steering column, airbag, occupant classification system, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the supplemental restraint system. Failure to take the proper precautions could result in accidental airbag deployment.
NOTE: A headlamp leveling switch is used only on vehicles manufactured for certain markets where headlamp leveling is required.
1. From the face of the driver side inboard bezel (4), align the headlamp leveling switch housing (1) to the mounting hole in the bezel.
2. Push the switch into the mounting hole until it is fully seated and each of the latch features (2 and 5) is fully engaged.
3. Position the switch and bezel unit to the instrument panel.
4. Reconnect the instrument panel wire harness connector to the switch connector receptacle (3).
5. Reinstall the trim bezel and switch unit onto the instrument panel. (Refer to 23 - BODY/INSTRUMENT PANEL/INSTRUMENT PANEL DRIVER SIDE BEZEL - INSTALLATION).
6. Reconnect the battery negative cable.