HEADLIGHT AUTO LEVELING SYSTEM
id091800010900
Outline
• The headlight auto leveling system automatically adjusts the headlight LO optical axis in response to changes in load and passenger conditions to prevent blinding of oncoming vehicles from headlight glare and to assure a range of visibility.
Function
• The headlight auto leveling system is controlled by the AFS control module/adaptive LED headlights control module.
Optical axis adjustment function
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• If the ignition is switched ON (engine on or off) and there is a vehicle height change when the headlights LO are illuminated, the AFS control module/adaptive LED headlights control module automatically adjusts the headlight optical axis.
• The AFS control module/adaptive LED headlights control module controls the optical axis adjustment function based on the following CAN signals.
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Signal name
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Sending module/part name
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Communication method
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Vehicle speed signal
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PCM
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HS-CAN
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Engine switch status signal
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Instrument cluster
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Headlight illumination status signal
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Front body control module (FBCM)
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Structural View
System Wiring Diagram
Operation
Optical axis adjustment if vehicle height changes while vehicle is stopped
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Operation condition
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• Operates when all of the following conditions are met:
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― Vehicle speed is 0 km/h {0 mph}
― Ignition switch ON (engine off or on)
― Headlight LO illumination (headlight LO illumination signal reception)
― Detects change in vehicle height amount* at specified value or more
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Operation
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1. When the ignition is switched ON (engine off or on), the auto leveling sensor inputs a vehicle height signal to the AFS control module/adaptive LED headlights control module.
2. When the headlights LO turn on, the AFS control module/adaptive LED headlights control module calculates the amount of change in the vehicle height* based on the vehicle height signal.
3. When the amount of change in the vehicle height* is the specified value or more, the AFS control module/adaptive LED headlights control module calculates the target optical axis based on the calculated amount of change in the vehicle height*.
4. The AFS control module/adaptive LED headlights control module outputs the calculated target optical axis signal to the headlight leveling actuator.
5. The headlight leveling actuator drives the motor when the target optical axis signal is input.
Optical axis adjustment if vehicle height changes while vehicle is moving
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Operation condition
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• Operates when all of the following conditions are met:
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― Headlight LO illumination (headlight LO illumination signal reception)
― Vehicle speed 30 km/h {19 mph} or more
― Detects change in vehicle speed of 3 km/h {2 mph} or less for continuous period of 25 s
― Detects change in vehicle height amount* at specified value or more
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Operation
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1. While the vehicle is travelling, the auto leveling sensor inputs the vehicle height signal to the AFS control module/adaptive LED headlights control module.
2. When the headlights LO turn on, the AFS control module/adaptive LED headlights control module calculates the amount of change in the vehicle height* based on the vehicle height signal.
3. When the vehicle speed is 30 km/h {19 mph} or more, the detected change in vehicle speed is 3 km/h {2 mph} or less for a continuous 25 s, and the change in the amount of vehicle height* is the specified value or more, the AFS control module/adaptive LED headlights control module calculates the target optical axis based on the calculated change in the amount of vehicle height*.
4. The AFS control module/adaptive LED headlights control module outputs the calculated target optical axis signal to the headlight leveling actuator.
5. The headlight leveling actuator drives the motor when the target optical axis signal is input.
* :The change in the amount of vehicle height is the calculated 1 s average value of the vehicle height signal which the AFS control module/adaptive LED headlights control module detects every 0.1 s.
