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WT-8 < FUNCTION DIAGNOSIS > TPMS FUNCTION DIAGNOSIS TPMS System Diagram INFOID:0000000005148206 System Description INFOID:0000000005148207 BODY CONTROL MODULE (BCM) The BCM is shown with the lower instrument panel LH removed. The BCM reads the air pressure signal received by the remote keyless entry receiver, and controls the low tire pressure warning lamp as shown below. It also has a self-diagnosis function to detect a system malfunction. TRANSMITTER A sensor-transmitter integrated with a valve is installed in each wheel, and transmits a detected air pressure signal in the form of a radio wave. The radio signal is received by the remote keyless entry receiver. REMOTE KEYLESS ENTRY RECEIVER ALEIA0004GB Condition Low tire pressure warning lamp System normal On for 1 second after ignition ON Tire less than 193 kPa (2.0 kg/cm 2 , 28 psi) [Flat tire] ON TPMS malfunction After key ON, flashes once per sec- ond for 1 minute, then stays ON LEIA0068E WEIA0137E |