System Structure: Notes
WARNING: This page is about a different car, the 2008 Honda Fit. However, it is still accessible from the selected car via links, so may be relevant.
Once the vehicle speed exceeds 28 mph (45 km/h), the TPMS control unit monitors all four tires and the system. If it detects low pressure in a tire, it alerts the driver by turning on the low tire pressure indicator. If it detects a problem in the system, it turns on the TPMS indicator.