| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a warming device for a vehicle surely detecting a failed state of the device, suppressing the increase of harness for a failure signal to a minimum, and excellent in cost performance. <P>SOLUTION: In the warming device for a vehicle seat, at least two heaters H1 and H2 connected in parallel, a sub-heater HS, a thermostat TH for overheat prevention, and a current control element Q1 are connected in series, and according to respective abnormal conditions during disconnection failure in either of the heater H1 or the heater H2, disconnection failure in both of the heater H1 and heater H2, OFF failure of the current control element Q1, ON failure of the current control element Q1, and an open circuit of the thermostat TH for overheat prevention, the contents of the abnormal conditions are determined by the combination of voltage output on one output line and a driving signal of the current control element Q1. <P>COPYRIGHT: (C)2012,JPO&INPIT |
