LIGHTING SYSTEM


  1. FUNCTION OF MAIN COMPONENTS

    Component Function
    Headlight ECU Sub-assembly LH

    • Controls the automatic headlight beam level control system.

    • Detects the vehicle posture and vehicle driving conditions based on the rear height control sensor sub-assembly LH and skid control ECU to control the headlight leveling motor LH.
    Headlight ECU Sub-assembly RH Controls the headlight leveling motor RH according to control signals from the headlight ECU sub-assembly LH.
    Headlight Leveling Motor LH/RH Moves the headlights vertically and controls the beam axis direction according to control signals from the headlight ECU sub-assembly LH/RH.

    Brake Booster with Master Cylinder Assembly


    • Skid Control ECU

    		 Transmits the vehicle speed signal to the headlight ECU sub-assembly LH.
    Rear Height Control Sensor Sub-assembly LH Detects vehicle movement and transmits a signal to the headlight ECU sub-assembly LH.
    Headlight Dimmer Switch Assembly Transmits a light control signal to the main body ECU (multiplex network body ECU).
    Main Body ECU (Multiplex Network Body ECU) Receives a light control signal and transmits it to the headlight ECU sub-assembly LH.

  2. SYSTEM CONTROL


    1. The headlight ECU sub-assembly LH receives vehicle height change signals sent from the rear height control sensor sub-assembly LH and calculates the changes in the pitch angle of the vehicle. The headlight ECU sub-assembly LH/RH drives the headlight leveling motor LH/RH in accordance with the change.

      Control Mode Details
      While Stopped If the vehicle attitude is stable for approximately 3 seconds with the headlights on while stopped, the headlight ECU sub-assembly LH/RH operates the headlight leveling motor LH/RH in accordance with the detected change in vehicle attitude.

  3. FUNCTION


    1. The rear height control sensor sub-assembly LH detects the changes in vehicles rear ride height due to cargo loads etc., and operates the headlight leveling motor RH/LH in accordance with the changes, keeping the headlight axes at a constant angle.

    2. Depending on the specification of the vehicle, either dynamic control which maintains a constant beam angle, or static control which adjusts the beam angle only when the vehicle is stopped, is used.

  4. FAIL-SAFE


    1. If the headlight ECU sub-assembly detects a malfunction in the automatic headlight beam level control system, the headlight ECU sub-assembly performs the fail-safe operation. For details, refer to the Repair Manual.