Tire Monitoring System: Description and Operation

System Components

System Description
TRANSMITTER





A sensor-transmitter integrated with a valve is installed on a wheel, and transmits a detected air pressure signal in the form of a radio wave.

REMOTE KEYLESS ENTRY RECEIVER





The remote keyless entry receiver receives the air pressure signal transmitted by the transmitter in each wheel.

BCM (BODY CONTROL MODULE)









The BCM reads the air pressure signal received by the remote keyless entry receiver, and controls the low tire pressure warning lamp and the buzzer operations as shown below. It also has a judgement function to detect a system malfunction.

LOW TIRE PRESSURE WARNING LAMP





The combination meter receives tire pressure status from the BCM using CAN communication. When a low tire pressure condition is sensed by the BCM, the combination meter low tire pressure warning lamp and buzzer are activated.

DISPLAY (TRIPLE METER)





Displays the air pressure of each tire.
^ After the ignition switch is turned ON, the pressure values are not be displayed until the data of all four wheels stabilizes.

CAN COMMUNICATION
System Description
Controller Area Network (CAN) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.
Refer to "CAN COMMUNICATION".