AUTO LEVELING CONTROL MODULE CONSTRUCTION/OPERATIONSM1935470
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 DSC HU/CM and the auto leveling sensor. (Vehicles with front auto leveling sensor)
• 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 and the auto leveling sensor. (Vehicles without front auto leveling sensor)
• If an error signal from the auto leveling sensor or excessive power supply voltage is detected, the headlight auto leveling warning 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 DSC HU/CM, and front and rear auto leveling sensors. The control module then calculates the optimal direction for the optical axis. (Vehicles with front auto leveling sensor)
• The auto leveling control module verifies changes in vehicle speed and attitude based on signal inputted from the instrument cluster, and rear auto leveling sensors. The control module then calculates the optimal direction for the optical axis. (Vehicles without front auto leveling sensor)
• 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 headlight auto leveling warning 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

Vehicles without front auto leveling sensor

Item

Test condition

Fail-safe function

Warning light

Cancel condition
Battery voltage
Power supply voltage malfunction
Battery voltage of 9.0 V or less, or 18.1 V or more detected
Stopped at current control position.
Not illuminated
When battery voltage of 17.5 V or less, or 9.3 V or more is detected.
Auto leveling sensor
Signal malfunction
Signal voltage of 0.25 V or less, or 4.75 V or more detected for 10 s or more
Stopped at current control position.
Illuminated*1
Continuous normal operation for 5 s or more.
Power supply malfunction
Power supply voltage of 4.6 V or less detected for 10 s or more
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.

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

Vehicles with front auto leveling sensor

Item

Test condition

Fail-safe function

Warning 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.
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
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 or more detected
Fixes the optical axis angle at the position where vehicle speed of 180 km/h or more detected
Not illuminated
Vehicle speed of less than 180 km/h 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.
Note
• When the ignition switch is turned to the ON position, the auto leveling control module checks the headlight auto leveling warning light and illuminates the light for 3 s to indicate that there is no malfunction.
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