System Description

SYSTEM

System Description

- During driving, the TPMS (Tire Pressure Monitoring System) receives the signal transmitted from tire pressure sensor installed in each wheel. The low tire pressure warning control unit has pressure judgment and trouble diagnosis functions. When the low tire pressure warning control unit detects low inflation pressure or another unusual symptom, the low tire pressure warning lamps in the combination meter comes on.
- If the tire pressure is less than the specified value, the low tire pressure warning lamp illuminates that the tire pressure is less than the specified value.
- Activates the TPMS (Tire Pressure Monitoring System) when the vehicle speed is 40 km/h (25 MPH) or more.
- The tire pressure information for each wheel is displayed on the vehicle information display.
- Added tire inflation indicator function to TPMS (Tire Pressure Monitoring System). Refer to "Tire Inflation Indicator Function" Tire Inflation Indicator Function.

SYSTEM DIAGRAM







INPUT/OUTPUT SIGNAL

The signal transmission/reception between units via a communication line is mainly as listed in the following table.





*: TCM used for the tire inflation indicator function.

LOW TIRE PRESSURE WARNING LAMP CONTROL CONDITION

Uses CAN communication from the low tire pressure warning control unit to illuminate the low tire pressure warning lamp on the combination meter.






HAZARD WARNING LAMP CONTROL CONDITION

The low tire pressure warning control unit transmits a hazard request signal to BCM. BCM blinks the hazard warning lamp, according to the signal.
The hazard warning lamp blinks under the following conditions.
- When wake-up of registered wheel has been completed. Refer to "Work Procedure" Work Procedure.
- When ID registration is completed. Refer to "Work Procedure" ID Registration.
- During the use of the tire inflation indicator function.

HORN CONTROL CONDITION

The low tire pressure warning control unit transmits a horn request signal to BCM. BCM controls horn sound, according to the signal.
The horn sounds under the following condition.
- During the use of tire inflation indicator function.