HEADLIGHT AUTO LEVELING SYSTEM
id091800010900
With auto leveling sensor
Outline
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• 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
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• The headlight auto leveling system is controlled by the auto leveling control module/adaptive LED headlights control module.
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Optical axis adjustment function
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• If there is a vehicle height change with the ignition switched ON (engine on or off) and the headlights LO turned on, the auto leveling control module/adaptive LED headlights control module automatically adjusts the headlight LO optical axis.
• The auto leveling control module/adaptive LED headlights control module controls the optical axis adjustment function based on the following 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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Ignition switch position signal
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Instrument cluster
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Headlight LO on condition signal
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Front body control module (FBCM)
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Vehicle height signal
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Auto leveling sensor
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Hard wire
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Structure/Construction
System structure
System wiring diagram
Without adaptive LED headlights
With adaptive LED headlights
Operation (Vehicle height changes while vehicle is stopped)
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Operation conditions
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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} (0 km/h {0 mph} vehicle speed signal is received)
― Ignition is switched ON (engine off or on) (ignition switch status signal (ON) is received)
― Headlights LO on (headlight LO on condition 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 sends (1) a vehicle height signal to the auto leveling control module/adaptive LED headlights control module.
2. When the auto leveling control module/adaptive LED headlights control module receives (2) a headlight LO on condition signal from the front body control module (FBCM) via CAN communication, it calculates (3) the amount of change in the vehicle height* based on the vehicle height signal.
3. When the auto leveling control module/adaptive LED headlights control module detects (4) the amount of change in the vehicle height* at the specified value or more, it calculates the target optical axis (5) based on the calculated amount of change in the vehicle height*.
4. The auto leveling control module/adaptive LED headlights control module sends (6) the calculated target optical axis signal to the headlight leveling actuator.
5. When the target optical axis signal is received, the headlight leveling actuator drives (7) the motor.
* :The change in the amount of vehicle height is the calculated 1 s average value of the vehicle height signal which the auto leveling control module/adaptive LED headlights control module detects every 0.1 s.
Operation (Vehicle height changes while vehicle is moving)
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Operation conditions
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• Operates when all of the following conditions are met:
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― Vehicle speed is 30 km/h {19 mph} or more (vehicle speed signal of 30 km/h {19 mph} or more is received)
― Headlight LO on (headlight LO on condition signal reception)
― 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. The auto leveling sensor sends (1) a vehicle height signal to the auto leveling control module/adaptive LED headlights control module while the vehicle is being driven.
2. When the auto leveling control module/adaptive LED headlights control module receives (2) a headlight LO on condition signal from the front body control module (FBCM) via CAN communication, it calculates (3) the amount of change in the vehicle height* based on the vehicle height signal.
3. When the auto leveling control module/adaptive LED headlights control module detects (4) the vehicle speed of 30 km/h {19 mph} or more, change in vehicle speed of 3 km/h {2 mph} or less for a continuous 25 s, and the change in the amount of vehicle height* at the specified value or more, it calculates (5) the target optical axis based on the calculated change in the amount of vehicle height*.
4. The auto leveling control module/adaptive LED headlights control module sends (6) the calculated target optical axis signal to the headlight leveling actuator.
5. When the target optical axis signal is received, the headlight leveling actuator drives (7) the motor.
* :The change in the amount of vehicle height is the calculated 1 s average value of the vehicle height signal which the auto leveling control module/adaptive LED headlights control module detects every 0.1 s.
Without auto leveling sensor
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 (Optical axis adjustment function)
-
• The headlight auto leveling system is controlled by the auto leveling control module/adaptive LED headlights control module.
• If there is a vehicle height change with the ignition switched ON (engine on or off) and the headlights LO turned on, the auto leveling control module/adaptive LED headlights control module automatically adjusts the headlight LO optical axis.
• The auto leveling control module/adaptive LED headlights control module controls the optical axis adjustment function based on the following signals.
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Signal name
|
Sending module/part name
|
Communication method
|
|
Vehicle speed signal
|
PCM
|
HS-CAN
|
|
Ignition switch position signal
|
Instrument cluster
|
|
Headlight LO on condition signal
|
Front body control module (FBCM)
|
Structure/Construction
System structure
System wiring diagram
Without adaptive LED headlights
With adaptive LED headlights
Operation (Vehicle attitude angle changes while vehicle is stopped)
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Note
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• When the vehicle attitude angle changes with the ignition switched off and the ignition is switched ON under this condition, the optical axis may be temporarily deviated. The optical axis deviation is corrected by driving the vehicle approx. 2km {2 mile} to 9 km {5 mile}.
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Operation conditions
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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} (0 km/h {0 mph} vehicle speed signal is received)
― Ignition is switched ON (engine off or on)(ignition switch position ON signal is received)
― Headlights LO on (headlight LO on condition signal reception)
― Detects amount of change in vehicle attitude angle* at specified value or more
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Operation
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1. The auto leveling control module/adaptive LED headlights control module calculates (1) the amount of change in the vehicle attitude angle based on the vehicle attitude angle in the unloaded condition and the vehicle attitude angle detected by the internal acceleration sensor.
2. When the auto leveling control module/adaptive LED headlights control module detects (3) change in the vehicle attitude angle at a vehicle speed of 0 km/h {0 mph} and the amount of change in the vehicle attitude angle at the specified value or more while it receives (2) a headlight LO on condition signal via CAN communication from the front body control module (FBCM), it calculates (4) the target optical axis based on the calculated amount of change in the vehicle attitude angle.
3. The auto leveling control module/adaptive LED headlights control module sends (5) the calculated target optical axis signal to the headlight leveling actuator.
4. When the target optical axis signal is received, the headlight leveling actuator drives (6) the motor.
* :The amount of change in the vehicle attitude angle is the calculated value for the vehicle attitude angle information in the unloaded condition recorded by the auto leveling control module/adaptive LED headlights control module for the initial learning and the vehicle attitude angle information detected by the acceleration sensor.
Operation (Vehicle attitude angle changes while vehicle is being driven)
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Operation conditions
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• Operates when all of the following conditions are met:
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― Vehicle speed exceeds 0 km/h {0 mph} (vehicle speed signal of exceeding 0 km/h {0 mph} is received)
― Headlight LO on (headlight LO on condition signal reception)
― Detects change in vehicle attitude angle for approx. 50 s
― Detects amount of change in vehicle attitude angle* at specified value or more
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Operation
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1. The auto leveling control module/adaptive LED headlights control module calculates (1) the amount of change in the vehicle attitude angle* based on the vehicle attitude angle in the unloaded condition and the vehicle attitude angle detected by the internal acceleration sensor.
2. When the auto leveling control module/adaptive LED headlights control module detects (3) change in the vehicle attitude angle at a vehicle speed of 0 km/h {0 mph} or more for approx. 50 s and the amount of change in the vehicle attitude angle at the specified value or more while it receives (2) a headlight LO on condition signal via CAN communication from the front body control module (FBCM), it calculates (4) the target optical axis based on the calculated amount of change in the vehicle attitude angle.
3. The auto leveling control module/adaptive LED headlights control module sends (5) the calculated target optical axis signal to the headlight leveling actuator.
4. When the target optical axis signal is received, the headlight leveling actuator drives (6) the motor.
* :The amount of change in the vehicle attitude angle is the calculated value for the vehicle attitude angle information in the unloaded condition recorded by the auto leveling control module/adaptive LED headlights control module for the initial learning and the vehicle attitude angle information detected by the acceleration sensor.
