Tire Pressure Monitor (TPM) System

A tire pressure monitor valve sub-assembly (equipped with a tire pressure sensor and a transmitter) is installed in each tire and wheel assembly. The sensor measures the tire pressure, and the measured value and transmitter ID are transmitted to the tire pressure monitor antenna on the body as radio waves.

These radio waves are then sent to the tire pressure monitor ECU from the tire pressure monitor receiver. If the transmitter ID has already been registered, the ECU compares the measured air pressure value with the standard value. When the value is less than the standard value registered in the tire pressure monitor ECU, the warning light on the instrument cluster comes on.

CAUTION: The warning system may not activate immediately if bursts or sudden air leakage should occur.

The tire pressure warning reset switch is used to address the differences in the air pressure settings by the type of tires, or the differences in pressure between the front and rear tires. This switch is used to initialize warning system after certain repair procedures.

The tire pressure warning selector switch allows 2 sets of ID codes to be registered. The code of the tires originally installed on the vehicle is registered on the switch at "MAIN". When a new set of tires are installed, they can be registered in the "2nd" position. Once registered, the setting position can be changed each time tires and wheels are replaced, and re-registration is not required.

NOTE: When the tires whose ID code is registered at "MAIN" are used, the system does not work properly with the selector switch set at "2nd". If the tires whose ID code is registered at "2nd" are stored nearby, the system will detect their tire pressure (and vice versa).

NOTE: This system has transmitters with different bending angles at the tire pressure sensor for aluminum wheels. They are not interchangeable with other wheels.

Under the following conditions, the system may not function properly:

The areas, facilities or devices that use similar radio wave frequencies are located in the vicinity of the vehicle.
A radio device of similar frequency is used in or near the vehicle.
A lot of snow or ice is stuck to the vehicle, especially the wheels and around the wheel houses.
The battery of the sensor has been depleted.
A tire without tire pressure sensor is used.
Snow tires or tire chains are used.
The spare tire is in use.
If any other wheels than the specified ones are used, the system may not function properly because the radio waves are differently transmitted from the tire pressure sensor.
Depending on the tire type, the system may not function properly even though the specified wheels are used.
Although tires with tire pressure sensors are used, the TPMS selector switch is set to the other tire setting.