Patent ID: 7124002

Claim:
A tire air pressure abnormality warning device comprising: a transmitter for transmitting a signal that corresponds to air pressure of a tire measured by a pressure sensor; a portable keyless entry device for opening and closing a door lock of a vehicle; and a vehicle-installed device for determining whether or not the air pressure of the tire is abnormal by receiving the signal from the transmitter in order to output data regarding the determination, the vehicle-installed device driving the door lock by communication with the portable device; wherein the vehicle-installed device comprises a recording section for recording data of any abnormality in the air pressure of the tire, wherein the portable device comprises a warning indicating section for indicating that the air pressure of the tire is abnormal, wherein the vehicle-installed device searches for any abnormality data from the recording section when the vehicle-installed device communicates with the portable device, so that, when there is abnormality data, a tire air pressure abnormality signal is transmitted to the portable device, and wherein the portable device indicates a warning of an abnormal air pressure of the tire by the tire air pressure abnormality signal that the portable device has received.