Patent ID: 8829708

Claim:
An in-vehicle apparatus control system for controlling an in-vehicle apparatus installed in a vehicle comprising: a storage unit configured to store voltage-change pattern data, having a minimum threshold level and a maximum threshold level, that indicates change in voltage level, as associated with an elapse of time, the voltage levels being detected for each of a plurality of periods based on an operating condition of an engine of the vehicle at a time when the engine starts; a voltage detection unit configured to detect voltage levels of a battery installed in the vehicle for the respective periods when the engine starts; a determination unit configured to determine whether the voltage levels detected by the voltage detection unit for the respective periods are within an allowable range from the minimum threshold level to the maximum threshold level of the stored voltage-change pattern data; and a control unit configured to control the in-vehicle apparatus to operate in normal operation if it is determined that the detected voltage levels are within the allowable range from the minimum threshold level to the maximum threshold level of the stored voltage-change pattern data and to control the in-vehicle apparatus not to operate in the normal operation if it is determined that the detected voltage levels do not match the stored voltage-change pattern data, wherein the control unit acquires the maximum threshold level by adding a specific level to a maximum level of the detected voltage levels and obtains the minimum threshold level by subtracting a specific level from a minimum level of the detected voltage levels.