AUTO LEVELING CONTROL MODULE CONSTRUCTION/OPERATION

• The auto light control module is attached to the blower motor which is behind the glove box on the left side, while it is located in the inside of the instrument panel on the passenger's side on the right side.

• In order to prevent blinding from oncoming traffic and to improve visibility, the auto leveling control module automatically controls the optical axis direction for optimal illumination based on signals input from the DSC HU/CM and the auto leveling sensor.

• If an error signal from the auto leveling sensor is detected, the auto leveling light is illuminated to warn the driver of a malfunction.

• The auto leveling control module recognizes the speed and attitude of the vehicle based on signals from either DSC HU/CM, plus the front/rear auto leveling sensor. The control module calculates the amount of optical axis adjustment.

• Based on the calculation of the optical axis adjustment, the auto leveling control module controls the headlight leveling actuator.

• The fail-safe function operates when the auto leveling control module detects a malfunction. It also warns the driver of a malfunction by illuminating the indicator light as shown in the fail-safe function table.

• The fail-safe function controls each part as shown on the fail-safe function table.

Item	Test condition		Fail-safe function	Indicator light	Cancel condition
Auto leveling sensor	Signal malfunction	Signal voltage of 4.0 V or less detected 10 times or more within 5 s	Returns headlights to the initial set position if they are pointing higher than initial set position. Fixes them in position where the malfunction is determined if pointing lower than the initial set position.	Illuminated*1	Continuous normal operation for 5 s or ignition switch is turned off and then to the ON position again.
Auto leveling sensor	Power supply malfunction	Power supply voltage of 0.25 V or less, or 4.75 V or more detected 10 times or more within 5 s		Illuminated*1
Auto leveling control module	Malfunction detected by auto leveling control module		Resets microcomputer in auto leveling control module.	Illuminated	Ignition switch is turned off and then to the ON position again.
DSC HU/CM	Vehicle speed of 180 km/h {111 mph} or more detected		Fixes the optical axis angle at the position where vehicle speed of 180 km/h {111 mph} or more detected	Not illuminated	Vehicle speed of less than 180 km/h {111 mph} detected
Battery voltage	Excessive power supply voltage	Battery voltage of 18.5 V or more detected	Fixes headlights in position where excessive power supply voltage was determined.	Illuminated	When battery voltage of 17.5 V or less is detected, or ignition switch is turned off and then to the ON position again.

*1 : Indicator light illuminates only when either malfunction condition is detected two consecutive times.