VEHICULAR ANTITHEFT ALARM DEVICE

PROBLEM TO BE SOLVED: To provide a vehicular antitheft alarm device capable of setting various kinds of security modes even when any setting switch or the like is provided on a portable machine or a vehicular antitheft alarm device. SOLUTION: The vehicular antitheft alarm device 10 has an abnormality determination unit 14b which determines presence/absence of any abnormality based on the sensor signal input from a sensor, and generates the alarm output when an abnormality is determined. In this case, the vehicular antitheft alarm device comprises a detection means which is connected to a lock driving motor 4 to lock and unlock a door provided on a vehicle to determine whether or not the door is locked from a state of the connected lock driving motor, and a plurality of security mode setting units 14a capable of setting the security mode in which the abnormality determination means is in a security mode. A security mode control unit determines the security mode according to the history of the change of the state of an ACC power supply of the vehicle before the detection means determines that the door is locked. COPYRIGHT: (C)2007,JPO&INPIT