Tire Pressure Monitoring Transponder

Tire Pressure Monitoring Transponder

Description

A transponder, sometimes referred to as a trigger module, is located in three of the four wheel wells (behind the wheelhouse liners) of a vehicle equipped with premium TPM. These transponders are used to provide the wireless ignition node with the location of the tire pressure sensors on the vehicle. A fourth transponder is not necessary in the remaining wheel well due to the process-of-elimination theory. Once the system knows the location of the first three sensors it assumes the location of the fourth tire pressure sensor. On this vehicle, there is a transponder located in the left front, right front, and right rear wheelhouse. There is not a transponder located in the left rear wheelhouse.

Operation

The TPM receives information from each of the sensors in the form of RF signals. The information contained in each of the transmissions provides all the information necessary for the TPM to determine the pressure in each tire as well as the position of the sensor. This auto locating process only happens in the first 10 minutes of any drive cycle while traveling at speeds above 15 mph (24 km/h). The auto locating process will start again only if the vehicle has been shut off for approximately 20 minutes or longer.