System Communication

When the vehicle is running, an RF (radio frequency) band wave signal is continuously transmitted from each tire pressure sensor to the control unit.
When the ignition switch is turned ON (II), the initiators send an LF (low frequency) band wave signal to the tire pressure sensors, switching them from sleep mode to normal function mode. When the ignition switch is turned OFF, the sensors switch from normal function mode back to sleep mode to extend their battery life.
Each tire pressure sensor has its own ID to prevent jamming by similar systems on other vehicles. After memorizing all the sensor IDs, the control unit receives only those specific signals.
An ID can be memorized manually or automatically. Each initiator is hardwired to the control unit. Every time the ignition is turned ON (II), the control unit asks each initiator for a sensor ID. The initiators then transmit the sensor IDs, and the control unit receives and memorizes them. The control unit then knows which ID belongs to each tire location. This recurring ID confirmation prevents any confusion in the system as a result of normal tire rotation.
NOTE: Be careful not to bend the brackets on the TPMS control unit and front initiators Misalignment of the control unit and initiators could interfere with sending and receiving signals.

Fig 1: Identifying Control Unit, Initiator And Tire Pressure Sensor
Courtesy of AMERICAN HONDA MOTOR CO., INC.