HEADLIGHT AUTO LEVELING SYSTEM OPERATION


BHE091801052T09

Varying Passenger and Cargo Conditions Operation

1. According to the fluctuation of the suspension, the auto leveling sensors installed in the front and rear of the vehicle send a signal to the auto leveling control unit.

2. When a difference between two of the signals input from the auto leveling sensors is detected, the auto leveling control unit verifies the vehicle attitude, then calculates the amount of optical axis adjustment. The auto leveling control unit compares the actual and required positions of the reflector, then inputs a command signal to the headlight leveling actuator.

1
Zero setting
2
Optical axis
3
Large passenger or cargo weight
4
Vehicle attitude
5
Low
6
Zero reference
7
High
8
Front auto leveling sensor
9
Rear auto leveling sensor
10
Optical axis adjustment amount
11
DSC HU/CM
12
Auto leveling control unit
13
Instrument cluster
14
Headlight leveling actuator (LH)
15
Headlight leveling actuator (RH)
16
Difference between two voltage signals

Operation When Driving

1. When the auto leveling control unit detects the vehicle is running at a constant vehicle speed between 30-180 km/h for 3 s continuously while the headlights are on, the average value of the vehicle attitude during the period is calculated and the optical axis is adjusted. (The adjustment control is operated only once per each period of driving.)

Note
• When the ignition switch is turned to the ON position, it is normal to hear the headlight leveling actuator operating for a few seconds, as it verifies system operating conditions.