| 摘要 |
In order to provide a technique effective in reducing the current to be supplied to a detector, a buckle switch (30) that senses the condition of wearing a seatbelt (11) includes a first detection circuit (30A) including a first switch (30a) that is in the open position when the seatbelt (11) is in use and is in the closed position when the seatbelt (11) is not in use, and a second detection circuit (30B) including a second switch (30b) that is in the closed position when the seatbelt (11) is in use and in the open position when not in use. An ECU (50) supplies power to the first detection circuit or the second detection circuit whose switch is in the open position. The ECU (50) also controls a motor (52) in response to a detection signal outputted from the first detection circuit or the second detection circuit that is supplied with power. The sleep mode of the ECU (50) is canceled when the detection signal outputted from the first detection circuit or the second detection circuit that is supplied with power changes.
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