Patent ID: 7173521

Claim:
A system for warning against a tire air pressure comprising: air pressure measuring means for measuring a tire air pressure of a tire of a vehicle; air pressure judging means for judging, on the basis of the tire air pressure measured by said air pressure measuring means, whether or not the tire air pressure is proper; warning issuing means for issuing, if a result of the judgment by said air pressure judging means is negative, a warning; driver on-board judging means for judging whether or not a driver is on board the vehicle; and driver detecting means for detecting whether or not the driver is in the proximity to the vehicle, if the result of the judgment by said air pressure judging means is negative, a result of the judgment by said driver on-board judging means is negative and a result of the detection by said driver detecting means is positive, said warning issuing means issues the warning outside the vehicle.