LIGHTING SYSTEMS
09–18–8
AUTO LEVELING CONTROL MODULE FUNCTION
CHU091801052S10
• 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 ABS
(DSC) HU/CM 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.
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 in the fail-safe function table.
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.
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.
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.
AUTO LEVELING
INDICATOR LIGHT
INSTRUMENT CLUSTER
CHU0918S110
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