| 摘要 |
<p>PROBLEM TO BE SOLVED: To detect a fraudulent act in an off state of a main power switch 68 by an X-axis MI sensor 70.SOLUTION: In an off state of a main power switch 68, an auxiliary power circuit 78 supplies drive power to an X-axis MI sensor 70. A sensor control circuit 77 compares a result detected by the X-axis MI sensor 70 with a threshold to determine the presence of a fault when a relative posture of the X-axis MI sensor 70 to terrestrial magnetism is varied by applying external force to the X-axis MI sensor 70 in the off state of the main power switch 68.</p> |
