| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the weight of a wire harness, and simplify wiring by transmitting signals according to outputs of an accessory switch, an ignition switch and plural electric equipment switches in a superimposed shape to a single signal line, and turning on and off various electric equipments according to the transmitted signal. SOLUTION: An ignition key switch 4 is put in an OFF position, and when an operation switch 3e is turned on, a multiple signal answering circuit 10 transmits a signal corresponding to a detecting result to a multiple signal receiving circuit 12 through a signal line 11 after an L level signal is supplied. Then, the multiple signal receiving circuit 12 excites a relay R5, and puts its relay contact point r5 in an ON condition, and supplies a power source to a load 1e. The key switch 4 is put in an Acc position, and when an Acc switch is turned on, positive side power source voltage of the power source 7 is supllied to the input end of a voltage detecting circuit 16, and an output signal of the circuit 16 is reversed to an L level by an inverter 20, and when an operation switch 3e is turned on, the power source is supplied to a load 1c.</p> |
