Patent ID: 7633381

Claim:
An electronic key system for a leisure vehicle, comprising: a portable device configured to transmit a user identification code by radio; and an electronic key controller that is equipped in a vehicle body of the leisure vehicle and is configured to receive the user identification code from the portable device and to cause an electric power supply of the leisure vehicle to be turned on upon receiving the user identification code; wherein the electric key controller is configured to transmit a confirmation signal to the portable device when acceleration of the leisure vehicle has an acceleration value higher than a predetermined acceleration value, and the portable device is configured to, upon receiving the confirmation signal, transition from a sleep mode to an active mode to transmit a response signal to the electronic key controller; and wherein the electronic key controller is configured to output a control signal to cause an alarm to be raised, when the electronic key controller does not receive the response signal from the portable device in response to the confirmation signal within a predetermined time.