Patent ID: 6880395

Claim:
A tire internal pressure monitor system provided in a vehicle, comprising: a plurality of sensor units, each of which is disposed in a tire of the vehicle, detects an internal pressure of the tire, and sends a transmission signal including a detected internal pressure value and an identification code; and a monitor unit that receives the transmission signal to monitor a state of the internal pressure of the tire based on the received detected internal pressure value and the identification code, wherein the monitor unit is either in a monitoring mode where the state of the internal pressure is monitored or in a registering mode where the identification code is registered, wherein, when the monitor unit receives the identification code in the registering mode, the monitor unit stores in a memory the identification code to register the identification code, and wherein the monitor unit includes notifying means that notifies, when the monitor unit registers the identification code, completion of registering the identification code by causing the vehicle to perform an operation that is visible from an outside of the vehicle.