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• The wheel unit monitors the tire pressure, internal temperature of the tire, and the acceleration rate of the tire, and sends the information as RF signals.


Sensor function

• The sensing function periodically monitors the following data and sends it to the LF control unit.
― Tire pressure
― Internal temperature of tires
― Tire acceleration rate
― Built-in battery voltage decrease
• Intervals in the tire information monitoring and information transmission to the LF control unit vary according to the operation mode (fluctuates depending on vehicle conditions).

On-board diagnostic function

• The on-board diagnostic function continuously performs malfunction diagnosis for each sensing function item. If the malfunction diagnosis results reveal a malfunction, the information is sent to the LF control unit.


• The wheel unit is installed to each wheel.
• The wheel unit also serves as a tire valve.

Structural View



• The wheel unit operates on a built-in battery, and regularly sends tire information as RF signals. The information it sends is retrieved using the sensing function that monitors tire pressure and temperature, and the on-board diagnostic function that detects the remaining battery power and sensor malfunctions.
• To maximize the life of the built-in battery, the unit uses the detected air pressure and acceleration rate to determine vehicle conditions such as driving and long stops, and operates in a mode appropriate to vehicle conditions so that battery consumption is minimized.
• Each wheel unit has its own identification code that is sent together with tire information and is used to verify which tire has abnormal tire pressure. In addition, the LF control unit stores the identification codes of wheel units. Therefore, if a wheel unit or the LF control unit is replaced, configuration of the identification codes is required.
• If the remaining level of the built-in battery decreases, the wheel unit outputs a signal. The multi-information display receives this signal and a warning is displayed. For details on the display content, refer to the MULTI-INFORMATION DISPLAY.(See MULTI-INFORMATION DISPLAY.)