| 摘要 |
PURPOSE:To perform highly efficiently and reliably the inspection of electrification of a conductive wire for heating window glass, by receiving and detecting ignition noises emitted from the conductive wire and by displaying the same for said inspection. CONSTITUTION:When a heating current from an on-vehicle generator is fed to each conductive wire for heating window glass via a noise filter by the closure of a defogger switch 5, ignition noises emitted from the conductor for heating are received and detected by a coil 20 and passed through a preamplifier 21a and a filter 21b. After a noise component is removed therein, a signal thus obtained is passed through an amplifier 21c and a wave-shaping unit 22 and subjected to pulse/DC conversion 23a in a display unit 23. A converted signal lights a lamp 23c of a lighting circuit 23b. When the conductive wire for heating is not electrified due to a fault, an output of detectin of the coil 20 is absent and thus the lamp 23c is not lighted. |
