HEADLIGHT AUTO LEVELING SYSTEM [(E)]

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Outline

•  The headlight auto leveling system automatically adjusts the headlight 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 auto leveling control module/adaptive LED headlights control module.

Optical axis adjustment function

•  If there is a vehicle height change with the main power switched ON (READY on or off) and the headlights turned on, the auto leveling control module/adaptive LED headlights control module automatically adjusts the headlight optical axis.
•  The auto leveling control module/adaptive LED headlights control module controls the optical axis adjustment function based on the following signals.

Signal name

Sending module/part name

Communication method
Vehicle speed signal
Electronically controlled brake unit
CAN
Main power switch condition signal
Body control module (BCM)
Headlight on condition signal
Headlight leveling actuator drive amount signal
Light control module


Structure/Construction


System structure

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System wiring diagram

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Operation


Vehicle attitude angle changes while vehicle is stopped

Operation conditions
•  Operates when all of the following conditions are met:
―  Vehicle speed is 0 km/h {0 mph} (0 km/h {0 mph} vehicle speed signal is received)
―  Main power is switched ON (READY on) (main power condition ON signal is received)
―  Headlights on (headlight on condition signal reception)
―  Detects amount of change in vehicle attitude angle* at specified value or more
Operation
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) the amount of change in the vehicle attitude angle at the specified value or more at a vehicle speed of 0 km/h {0 mph} while it receives (2) a headlight on condition signal via CAN communication from the body control module (BCM), it calculates (4) the target optical axis.
3.  The auto leveling control module/adaptive LED headlights control module sends (5) the calculated target optical axis signal to the body control module (BCM) via CAN communication.
4.  The body control module (BCM) sends (6) the calculated target optical axis signal to the light control module via CAN communication.
5.  When the light control module receives the target optical axis signal, it drives (7) the motor.
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*  :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.

Vehicle attitude angle changes while vehicle is being driven

Operation conditions
•  Operates when all of the following conditions are met:
―  Vehicle speed is 0 km/h {0 mph} or more (vehicle speed signal of 0 km/h {0 mph} or more is received)
―  Headlight on (headlight on condition signal reception)
―  Detects change in vehicle attitude angle for approx. 20 s
―  Detects amount of change in vehicle attitude angle* at specified value or more
Operation
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) the amount of change in the vehicle attitude angle at the specified value or more for approx. 20 s at a vehicle speed of 0 km/h {0 mph} or more while it receives (2) a headlight on condition signal via CAN communication from the body control module (BCM), it calculates (4) the target optical axis.
3.  The auto leveling control module/adaptive LED headlights control module sends (5) the calculated target optical axis signal to the body control module (BCM) via CAN communication.
4.  The body control module (BCM) sends (6) the calculated target optical axis signal to the light control module via CAN communication.
5.  When the light control module receives the target optical axis signal, it drives (7) the motor.
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*  :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.