Low tire pressure/TPMS indicator does not come on when the tire pressure has decreased(TPMS)

Diagnostic procedure

See general troubleshooting information "condition for data rejection, and case TPMS cannot operate normally" (Even if a system is normal, there is a possibility that cannot detect low tire pressure) .
Do the gauge control module self-diagnostic function .
Do the TPMS calibration .
Replace the VSA modulator-control unit .