Patent ID: 8120474

Claim:
A communication system for a vehicle, comprising: a portable identification device allowing keyless entry into the vehicle, including means for receiving an interrogation signal and means for transmitting an indication indicative signal responsive to the interrogation signal; a plurality of tire sensor devices, each of the tire sensor devices serving for providing information regarding a condition at a tire of the vehicle, each of the tire sensor devices including means for receiving an initiation signal and means for transmitting a condition indicative signal responsive to the initiation signal; a plurality of transmitting devices provided adjacent to the respective tire sensor devices, each of the transmitting devices emitting the interrogation signal and the initiation signal for different conditions within a communication area; a receiving device for receiving the indication indicative signal from the portable identification device and the condition indicative signal from each of the tire sensor devices; and a central controller for unlocking a door lock device only when the portable identification device is determined to be in an overlapped area between two adjacent communication areas based on a condition of the portable identification device.