Inspection Procedure 1: The TPMS warning light stays ON: Operation

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.

The TPMS warning light will illuminate when the tire inflation pressure of road wheel is below 189 kPa (27.4 psi).
Furthermore, the TPMS warning light illuminates for three seconds immediately after the ignition switch (engine starting switch) is turned to the "ON" position. This is a bulb check of the TPMS warning light.