| 摘要 |
PROBLEM TO BE SOLVED: To provide an occupant crash protection device which can determine abnormality even if both of a first and a second switches fail together in the same failure mode and can improve reliability of occupant detection by an occupant detection switch. SOLUTION: An occupant detection switch 33 is built in a buckle part of a seat belt device and has a first switch 34 and a second switch 35 which are turned on/off according to whether a tongue plate is hooked to a buckle part or not. MPU 31 outputs a signal indicating boarding of an occupant to a terminal P3 when the first switch 35 is on and the second switch 35 is off, and it outputs a signal indicating non-boarding of an occupant to the terminal P3 when the first switch 34 is off and the second switch 35 is on. When both the first switch 34 and the second switch 35 are on or off, the occupant detection switch 33 determines abnormality and output an alarm signal indicating abnormality to a terminal P4. |
