• The headlight auto leveling system is controlled by the auto leveling control module.
• The auto leveling control module constantly calculates the amount of vehicle inclination based on the vehicle height signal from the auto leveling sensor when the ignition is switched ON.
• The auto leveling control module calculates the acceleration and deceleration speed of the vehicle from the instrument cluster after the ignition is switched ON.
• With the ignition switched ON and the headlights switched from off to on, the auto leveling control module calculates the target headlight optical axis based on an average of the calculated amount of vehicle inclination, and outputs the target headlight optical axis signal to the headlight leveling actuator.
• Based on the target headlight optical axis signal from the auto leveling control module, the headlight leveling actuator drives the motor until it reaches the target headlight optical axis level.
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• The auto leveling control module controls the headlight optical axis in the following cases:
― Headlights switched from off to on while vehicle is stopped
― After headlights are switched from off to on while vehicle is stopped, and vehicle height changes (rear passengers, load changes)
― Headlights switched from off to on while vehicle in transit
― Amount of vehicle inclination changes as result of vehicle going from stopped condition to being driven
― Amount of vehicle inclination changes during vehicle travel
Headlights SwItched From Off To On While Vehicle Is Stopped
• Operation conditions
― Ignition switch ON
― Vehicle speed
0 km/h {0 mph}
― At point in time headlights are switched from off to on
• Operation
1. If the auto leveling control module detects a headlight on signal from the headlight relay, it calculates the target headlight optical axis based on the amount of vehicle inclination calculated in the 1 s period directly prior to detecting the headlight on signal.
2. The auto leveling control module outputs the target headlight optical axis signal to the headlight leveling actuator.
3. The headlight leveling actuator calculates the amount of motor drive based on the target headlight optical axis signal from the auto leveling control module and drives the motor until the headlights reach the target headlight optical axis level.
After Headlights Are Switched From Off To On While Vehicle Is Stopped, And Vehicle Height Changes (Rear Passengers, Load Changes)
• Operation conditions
― Ignition switch ON
― Vehicle speed
0 km/h {0 mph}
― Headlights on
― At point where amount of vehicle inclination change exceeds threshold value
• Operation
1. The auto leveling control module monitors the amount of vehicle inclination for a 3 s period from the point that the amount of vehicle inclination change, resulting from rear passenger or load changes, exceeds the threshold value.
2. If the amount of vehicle inclination change during the 3 s period does not exceed the threshold value, the headlight optical axis is calculated based on the average amount of vehicle inclination in the final 1 s period.
3. The auto leveling control module outputs the target headlight optical axis signal to the headlight leveling actuator.
4. The headlight leveling actuator calculates the amount of motor drive based on the target headlight optical axis signal from the auto leveling control module and drives the motor until the headlights reach the target headlight optical axis level.
Headlights Switched From Off to On While Vehicle In Transit
• Operation conditions
― Ignition switch ON
― Vehicle speed
30 km/h {19 mph} or more and during travel at constant vehicle speed
― At point in time headlights switched from off to on
• Operation
1. The auto leveling control module records the average amount of vehicle inclination calculated at the point in time when the vehicle first begins to travel from a stopped condition and in the 1 s period after the vehicle is stopped.
2. If the auto leveling control module detects a headlight on signal from the headlight relay while the vehicle is traveling, it calculates the target headlight optical axis based on the average amount of vehicle inclination which was previously recorded.
3. The auto leveling control module outputs the target headlight optical axis signal to the headlight leveling actuator.
4. The headlight leveling actuator calculates the amount of motor drive based on the target headlight optical axis signal from the auto leveling control module and drives the motor until the headlights reach the target headlight optical axis level.
Amount Of Vehicle Inclination Changes As Result Of Vehicle Going From Stopped Condition To Being Driven
• Operation conditions
― Ignition switch ON
― Vehicle speed
30 km/h {19 mph} or more and during travel at constant vehicle speed
― At point in time headlights switched from off to on
― At point where amount of vehicle inclination change exceeds threshold value
• Operation
1. The auto leveling control module monitors the amount of vehicle inclination for a 3 s period from the point that the amount of vehicle inclination change, resulting from the vehicle going from a stopped condition to one of being driven, exceeds the threshold value.
2. If the amount of vehicle inclination change during the 3 s period does not exceed the threshold value, the headlight optical axis is calculated based on the average amount of vehicle inclination in the final 1 s period.
3. The auto leveling control module outputs the target headlight optical axis signal to the headlight leveling actuator.
4. The headlight leveling actuator calculates the amount of motor drive based on the target headlight optical axis signal from the auto leveling control module and drives the motor until the headlights reach the target headlight optical axis level.
Amount Of Vehicle Inclination Changes During Vehicle Travel
Note
• Control of the headlight optical axis during vehicle travel is performed one time during one period of travel.
• Operation conditions
― Ignition switch ON
― Vehicle speed
30 km/h {19 mph} or more and during travel at constant vehicle speed
― At point in time headlights switched from off to on
― At point where amount of vehicle inclination change exceeds threshold value
• Operation
1. The auto leveling control module monitors the amount of vehicle inclination for a 3 s period from the point that the amount of vehicle inclination change, resulting from the change in the amount of vehicle inclination during vehicle travel, exceeds the threshold value.
2. If the amount of vehicle inclination change during the 3 s period does not exceed the threshold value, the headlight optical axis is calculated based on the average amount of vehicle inclination in the final 1 s period.
3. The auto leveling control module outputs the target headlight optical axis signal to the headlight leveling actuator.
4. The headlight leveling actuator calculates the amount of motor drive based on the target headlight optical axis signal from the auto leveling control module and drives the motor until the headlights reach the target headlight optical axis level.
