Tire Pressure Monitoring System (TPMS): Initiator
The initiators are located at the front of the front wheel arches and at the rear of the rear wheel arches and are secured with two scrivets. The TPMS has four initiators and each has a connector which connects with the body harness.
The initiator is a passive, Low Frequency (LF) transmitter. Each initiator provides an auto-location feature to identify tire positions on the vehicle and transmit that data to the central junction box (CJB).
The central junction box (CJB) energizes each initiator in turn using LF drivers. The corresponding tire pressure sensor detects the resulting LF transmission and responds by initiating an RF transmission of its data. This data is received by the RF receiver and communicated to the central junction box (CJB) via a K-bus. The central junction box (CJB) can then determine which sensor is transmitting and its location on the vehicle.