| 摘要 |
PROBLEM TO BE SOLVED: To learn a state that a portable machine is located outside a vehicle and within a prescribed distance, and to improve determination accuracy for determining which side of the inside or the outside of the vehicle the portable machine exists in. ! SOLUTION: A radio wave intensity of a collation signal when a portable machine 15 receives the collation signal from a key-free memory ECU 11 is held in a memory 11a as a confinement prevention threshold while considering that a prescribed condition is satisfied by the fact that a failure diagnosis device 20 is connected to the key-free memory ECU 11, and a learning mode is set in a state that the portable machine 15 is located outside a trunk room (vehicle outside) and within a prescribed distance from an own vehicle 1, and the presence/absence of the confinement of the portable machine 15 is determined on the basis whether or not the radio wave intensity of the collation signal when a response signal indicating that the collation signal is |
