| 摘要 |
PURPOSE:To prevent a battery from being dead, by disposing a canceling relay between the side to which a main relay and a door switch belong, and the heater changeover switch side to establish a self-holding circuit which is therefore isolated when a cabin door is once opened. CONSTITUTION:When a cabin door is opened for allowing a passenger to alight, vehicle, a main relay 5 is deenergized in association with a door switch 4, and a canceling relay 21 connected to the main relay 5 is deenergized so that a self-holding circuit is isolated. Further, after the passenger having alighted, if the cabin door is closed so that the door switch 4 is turned on, the self-holding circuit having the energized canceling relay 21 may not be established unless a heater changeover switch 9 is once turned on. Accordingly, even if the heater changeover switch 9 is left to be set at the position of any one of contacts A-C other than the turn-off position thereof, it is possible to prevent the heater being automatically turned on when the cabin door is closed. |
