Headlamp Leveling

NOTE:

The headlamp leveling switch is integral to the instrument panel switch bank, which communicates with the EMIC/CCN over the LIN data bus. Before performing any of the following tests, confirm whether the park lamps operate satisfactorily. Then determine whether the other functions of the instrument panel switch bank are operational. If the park lamps are ineffective or operate improperly, or if the other instrument panel switch bank functions are ineffective, diagnose and repair those problems before attempting to repair the Headlamp Leveling function.

CONDITION	POSSIBLE CAUSES	CORRECTION
ONE LEVELING MOTOR IS INEFFECTIVE	1. Ineffective ground circuit.	1. Test and repair open leveling motor ground circuit if required.
	2. Ineffective feed circuit.	2. Test and repair open leveling motor feed circuit if required.
	3. Ineffective signal circuit.	3. Test and repair open headlamp leveling motor signal circuit if required.
	4. Ineffective motor.	4. Test and replace headlamp leveling motor if required.
BOTH LEVELING MOTORS ARE INEFFECTIVE	1. Ineffective EMIC (CCN) inputs or outputs.	1. Use a diagnostic scan tool to test the EMIC (CCN) inputs and outputs. Refer to the appropriate diagnostic information.
	2. Ineffective motor ground circuit.	2. Test and repair open leveling motor ground circuit if required.
	3. Ineffective motor feed circuit.	3. Test and repair open leveling motor feed circuit if required.
	4. Ineffective signal circuit.	4. Test and repair open or shorted headlamp leveling motor signal circuit if required.
	5. Ineffective TIPM inputs or outputs.	5. Use a diagnostic scan tool to test the TIPM inputs and outputs. Refer to the appropriate diagnostic information.
	6. Ineffective motors.	6. Test and replace leveling motors if required.