Abstract: An automatic security enhancement system can automatically increase the security of the system when necessary. The system has at least two different states with each state has different security level. The state with low security could be changed into a state with higher security automatically when the system detects someone try to break the system. The state with low security could also be instructed to change into a state with higher security. However, a state with higher security will be changed into a state with lower security only when the system is commanded to do so.

Abstract: An action counter (27) counts the number of turn-on actions by an operator to an ignition switch (3) over a prescribed period of time, and a deceleration sensor (9) senses a deceleration imparted to the vehicle within a prescribed period of time. After the counted number of turn-on actions has exceeded a prescribed count value, if the deceleration exceeds a prescribed value, a switching intent determiner (5) makes a judgment of the operator's intent to switch the display mode of an air bag failure display device (17) from a normal mode to a maintenance mode.