Patent ID: 8446271

Claim:
A vehicle entry/tire pressure monitoring system for a vehicle, the system comprising: an electronic control unit (“ECU”); tire sensors mounted in, on or adjacent respective tires of the vehicle, each tire sensor being configured to transmit an RF signal; a portable transmission/reception unit configured to be carried by an operator of the vehicle and to transmit RF signals for controlling operations of the vehicle including unlocking doors of the vehicle; an antenna mounted on the vehicle and in communication with the ECU, the antenna being configured to transmit a low frequency (“LF”) tire sensor wake up field to wake up the tire sensors, wherein the tire sensor wake up field includes a unique header format, wherein the tire sensors only fully wake up upon receiving the unique header format; and wherein the portable transmission/reception unit partially awakes to process the unique header format in the LF tire sensor wake up field, and the portable transmission/reception unit enters into a sleep mode upon determining that the unique header format in the LF tire sensor wake up field does not match a predetermined header format.