The Tire Pressure Monitor (TPM) system uses radio and sensor technology to check tire pressure levels and temperature. If the vehicle has this feature, sensors are mounted on each tire and wheel assembly, except the spare tire. The TPM sensors transmit tire pressure and temperature readings to a receiver located in the vehicle. The TPM display is located on the lower driver side of the windshield molding. For additional information and details about the TPM operation and displays see Tire Pressure Monitor System .