If the light is flashing there is still a problem with the system.The TPMS needs to be scanned for codes.
The Low Tire Pressure Indicator
The TPMS Indicator
If the system is OK, the TPMS indicator and the low tire pressure indicator should come on when you turn the ignition switch to ON (II), and then go off 2 seconds later. If they don't, there is a problem with the system.DTC 11, 13, 15, 17 If the system detects low pressure in any of the four tires, the low tire pressure indicator comes on, and the TPMS control unit sets one or more of these codes: DTC 11, 13, 15, 17. When the tire pressure returns to normal, and the TPMS control unit receives the normal pressure signal from the tire pressure sensor, the TPMS control unit turns off the indicator. However TPMS control unit still retains the DTC(s).NOTE: It is necessary to test-drive the vehicle at 28 mph (45 km/m) or more for at least 1 minute so that the tire pressure sensor transmits the signal.