Tire pressure sensor
WARNING: This page is about a different car, the 2008 Honda Pilot, 2007 Honda Pilot, and 2006 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.
Each sensor is an integrated unit made up of the tire valve stem, a pressure sensor, and a transmitter. The unit is attached to the inside of the wheel, around the valve stem. The sensor transmits a signal to the control unit when tire pressure is less than 175 kPa (1.8 kgf/cm2 , 25 psi). The TPMS control unit then turns on the low tire pressure indicator and the appropriate tire indicator(s). When that tire's pressure is increased to more than 200 kPa (2.0 kgf/cm2 , 29 psi), the transmitter stops sending the signal, and the control unit turns the indicators off.