Patent ID: 7315237

Claim:
An antitheft unit installed in an automotive vehicle, comprising: a first sensor specifically detecting a signal indicating a predetermined theft-suspicious act done to the automotive vehicle in which a second sensor other than the first sensor is installed, and a controller configured to control an alarm to be generated against the predetermined theft-suspicious act in three selective states consisting of an alarm unset state for generating no alarm, a first alarm set state for generating the alarm under a condition where signals from both the first sensor and the second sensor are validated and used for performing the control, a second alarm set state for generating the alarm under a condition where the signal from only the second sensor is validated and used for performing the control, wherein the controller comprises a determining component configured to determine whether or not a signal commanding a shift is issued; and a controlling component configured to control the shift among the alarm unset state, the first alarm set state, and the second alarm set state such that the shift between the states is responsive to the signal, automatically and without a user's operation necessary for the shift performed manually on the automotive vehicle, when, it is determined that the signal is issued.