Resources "Normal (soft state) automatic control", "High-speed driving (hard state) automatic control", "Normal (standard state) automatic control" and "High-level automatic control" of the vehicle height.
The electronic air suspension system of the car has three selection switches - working mode selection switch, vehicle height selection switch and trail air suspension enable switch, which are manually selected by the operator. Among them, the working mode selection switch and the vehicle height selection switch are installed on the right side of the transmission panel, and the air suspension enable switch is installed on the left side of the trunk.
Air suspension set working mode
When the mode selection switch is set to "SPORT", the overslung suspension system enters the "High-speed driving automatic control", which focuses on improving the stability of the vehicle under conditions such as sharp turns, and is suitable for cars that often accelerate, decelerate or turn sharply.
When the mode selection switch is set to "NORM", the system carries out "normal automatic control" of the stiffness and damping force of the suspension, which focuses on the comfort of the ride, and is suitable for cars driving on high-level roads, city highways, traveling at speeds exceeding 110km/h, and on general curves. At this time, the suspension ECU adjusts the stiffness of the air spring and the damping force of the shock absorber according to signals such as the vehicle speed sensor, making it automatically in a soft, medium or hard state.
Air suspension sets vehicle height
The essence of adjusting the vehicle height is to inflate or deflate the air spring in the suspension by instructing the height control solenoid valve through the ECU. To raise the vehicle, air is inflated into the air spring; to lower the vehicle, the air spring is instructed to deflate through the exhaust valve.
The adjustment of the vehicle height has two modes: "normal" mode and "high" mode. When the vehicle height selection switch is set to "HIGH", the system carries out "High-level automatic control" of the vehicle height, which is suitable for cars driving on bumpy roads; when the switch is set to "NORM", the vehicle height enters the "normal automatic control" state, which is suitable for driving on general roads.
Enable and disable air suspension
Toyota installs an air suspension enable switch (also known as a "circuit breaker switch" or a "jack mode switch") on the left side of the trunk, which is actually a circuit breaker switch of the power circuit for tandem axle air suspension, utility trailer air suspension, and semi trailer air suspension.
When the air suspension enable switch is set to "ON", the air suspension system power circuit is connected, and the system can carry out automatic control of the vehicle height according to the selected mode; when the switch is set to "OFF", the system stops automatic control of the vehicle height, which is suitable for using when the car is changing tires, jacked up, towed or parked on uneven roads to avoid compressed air in the air spring being discharged, prevent sudden lowering of the vehicle body, and obstruct specific work or cause unexpected injury.
Identification of air suspension system indicator light
The indicator light of Toyota's electronic air suspension system is installed on the instrument panel. When the ignition switch is turned to "ON", the indicator light lights up for 2 seconds to check whether the indicator light bulb is burned out, and then goes out. The purpose of installing the suspension system indicator light is to indicate to the driver what state the air suspension system is currently in.