AIR SUSPENSION SYSTEM SYSTEM DESCRIPTION


  1. AIR SUSPENSION SYSTEM DESCRIPTION


    1. The suspension control ECU operates the compressor motor with the dryer and uses the solenoid valves to control the vehicle height by analyzing the information based on the switches, sensors and input signals.

    2. Through the 4 height control sensors, the suspension control ECU detects changes in the vehicle height that result from the number of occupants or the amount of the load. Then, the suspension control ECU controls the height control solenoid valves and the compressor motor with the dryer in order to automatically adjust the vehicle height to a constant (normal) level.

      Furthermore, 2 vehicle heights can be selected by operating the height control switch: HEIGHT HIGH and NORMAL.

    3. In cases such as when the vehicle is jacked up, the auto leveling function is prohibited by turning the power switch OFF. In cases when the vehicle is to be jacked up with the power switch ON (READY), the height control function can be stopped by connecting terminals 11 (OPA) and 4 (CG) of the DLC3.

    4. The drive mode select switch selects the shock absorber damping force (COMF, NORMAL (except COMF and SPORT S+) or SPORT S+).

    Function of components
    Component Function
    Absorber Control Actuators Change the damping force.
    Suspension Control Relay (AIR SUS) Supplies electricity to the compressor motor.
    Height Control Solenoid Valves Supply and discharge compressed air to and from the air chambers in 4 pneumatic cylinders (front left and right, rear left and right).
    Height Control Compressor Supplies compressed air to increase the vehicle height.
    Exhaust Solenoid Valve Discharges compressed air from the pneumatic cylinders to lower the vehicle.
    Height Control Sensors Detect the vehicle height and displacement volume of the suspension caused by unevenness of the road.
    Acceleration Sensor (for Front) Detects the front left body vertical accelerated motion.
    Acceleration Sensor (for Rear) Detects the rear body vertical accelerated motion.
    HEIGHT HIGH Indicator Light Displayed on the combination meter when the height control switch position is on HEIGHT HIGH.
    Height Control Switch Selects the vehicle height (NORMAL / HEIGHT HIGH).
    COMFORT Indicator Comes on indicating that damping force is in "COMFORT" mode by the drive mode select switch.
    SPORT S+ Indicator Comes on indicating that damping force is in "SPORT S+" mode by the drive mode select switch.
    Drive Mode Select Switch Selects the damping force (COMF, NORMAL (except COMF and SPORT S+) or SPORT S+).
    Skid Control ECU Receives the signals of the stop light switch and speed sensor, and sends them to the suspension control ECU.
    Suspension Control ECU

    • Controls the damping force and vehicle height according to the operation modes.

    • Detects the front right body vertical accelerated motion.