System Communication

When the ignition switch is turned ON (II), or the engine start/stop button is pressed to select the ON mode, an RF (radio frequency) band wave signal is transmitted from each tire pressure sensor to the TPMS control unit.
When the ignition switch is turned ON (II), or the engine start/stop button is pressed to select the ON mode, the initiators send a 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 to LOCK (0), or the engine start/stop button is pressed to select the OFF mode, the sensors switch from normal function mode back to sleep mode to extend their battery life.
Each tire pressure sensor has its own tire pressure sensor ID to prevent jamming by similar systems on other vehicles. After memorizing all the sensor IDs, the TPMS control unit recognizes only those specific signals.
A tire pressure sensor ID can be memorized manually or automatically. Each initiator is hardwired to the TPMS control unit. Every time the ignition is turned to ON (II), or the engine start/stop button is pressed to select the ON mode, the TPMS control unit asks each initiator to wake up the appropriate tire pressure sensor. The transmitters in the sensors then transmit the sensor IDs, and the TPMS control unit receives, and memorizes them. The TPMS control unit then knows which sensor ID belongs to each tire location. This recurring sensor 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 the front/rear initiators. Misalignment of the TPMS control unit and initiators could interfere with sending and receiving signals.

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