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HEADLIGHT AUTO LEVELING SYSTEM OPERATION

id091800104200

## 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 auto leveling control module (main).

2. When a difference between two of the signal inputted from the auto leveling sensors is detected, the auto leveling control module (main) verifies the vehicle attitude, then calculates the amount of optical axis adjustment and sends signal to the auto leveling control module (sub).

3. The auto leveling control module compares the actual and the required position of the reflector, then inputs a command signal to the headlight leveling actuator.

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

## Operation when driving

1. While driving with the headlights on, the auto leveling control module (main) receives an inputted vehicle speed signal from the ABS HU/CM or DSC HU/CM unit (referred to as ABS (DSC) HU/CM in this section) and a signal based on suspension fluctuation from the front and rear auto leveling sensors.

2. Based on the inputted vehicle speed signal, the auto leveling control module calculates acceleration angle and verifies the change in vehicle speed. Also, if there is a difference between two signal inputted from the front and rear auto leveling sensors, the auto leveling control module (main) unit verifies the actual attitude of the vehicle. The auto leveling control module (main) calculates the optical axis adjustment amount based on the condition of these two signal, and sends signal to the auto leveling control module (sub).

3. The auto leveling control module compares the actual and the required position of the reflector, then inputs command signal to the leveling actuator.

1 | Zero setting
2 | Acceleration
3 | Deceleration
4 | Auto leveling control module (main)
5 | Auto leveling control module (sub)
6 | Front auto leveling sensor
7 | Rear auto leveling sensor
8 | Headlight leveling actuator (LH)
9 | Headlight leveling actuator (RH)
10 | ABS HU/CM or DSC HU/CM
11 | Difference between two voltage signals
12 | Vehicle attitude
13 | Acceleration degree calculation
14 | Change in vehicle speed
15 | Optical axis adjustment amount
16 | Optical axis
17 | Zero reference
18 | High
19 | Low
20 | Vehicle speed
21 | Time

  Note

  • When the ignition switch is turned to ON, it is normal to hear the headlight leveling actuator operating for a few second, as it verifies system operating condition.
  • When driving on a consistently rough or uneven road, the auto leveling function would cause a flickering effect for oncoming traffic. Therefore, to prevent the blinding of oncoming traffic, the auto leveling function is slowed down.