AUTO LEVELING CONTROL MODULE CONSTRUCTION/OPERATION

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• 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 instrument cluster, auto light/wiper control module and the auto leveling sensor.

• If an error signal from the auto leveling sensor or excessive power supply voltage is detected, the auto leveling indicator light is illuminated to warn the driver of a malfunction.

Optical Axis Adjustment Feature

• The auto leveling control module verifies changes in vehicle speed and attitude based on signal inputted from the instrument cluster, auto light/wiper control module and the auto leveling sensor. The control module then calculates the optimal direction for the optical axis.

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

Fail-safe Function

• 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.

Fail-safe Function Table

Item

Detection item

Fail-safe function

Indicator light

Cancel condition

Auto leveling sensor

Input voltage from headlight auto leveling sensor outside of 0.5 V to 4.5 V range for continuous 10 s period.

Optical axis stopped at current position

Illuminated

Normal value detected for continuous 1 s period

Headlight leveling actuator

Output voltage malfunction (wiring harness wire, short to ground) to headlight leveling actuator.

Optical axis stopped at current position

Illuminated

Normal value detected for continuous 1 s period

Auto leveling control module

Headlight auto leveling system initial setting not implemented

Controls at preset value

Flashes every 0.25 s

Headlight auto leveling system initialization is completed normally

Item	Detection item	Fail-safe function	Indicator light	Cancel condition
Auto leveling sensor	Input voltage from headlight auto leveling sensor outside of 0.5 V to 4.5 V range for continuous 10 s period.	Optical axis stopped at current position	Illuminated	Normal value detected for continuous 1 s period
Headlight leveling actuator	Output voltage malfunction (wiring harness wire, short to ground) to headlight leveling actuator.	Optical axis stopped at current position	Illuminated	Normal value detected for continuous 1 s period
Auto leveling control module	Headlight auto leveling system initial setting not implemented	Controls at preset value	Flashes every 0.25 s	Headlight auto leveling system initialization is completed normally

Note

• When the ignition switch is turned to the ON position, the auto leveling control module checks the auto leveling indicator light bulb and illuminates the bulb for 3 s to indicate that there is no malfunction.

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