| 摘要 |
PURPOSE:To reduce the sensing precision error of an azimuth sensor for a car guidance device by connecting the ground wire of an electric furnishings mounted on a car provided with the azimuth sensor for a car guidance device to a car body only at the position near a battery in relation to the mounting position of the azimuth sensor. CONSTITUTION:A geomagnetic detection sensor 1 used as an azimuth sensor for a car guidance device is mounted on the roof panel 5 of a car body 3. In this case, the ground wire earthing structure of an electric furnishings mounted on the car body 3 is structured as follows. In other words, the ground wire of a battery 7 and a headlamp 9 is connected to the first front side earth point 13 in the vicinity of the battery 7 through a ground bus 11 provided in the car body 3. Besides, the ground wire of tail stop lamp 15 and a rear defogger 17 is connected to the ground bus 11 and the ground current of these electric furnishings flows to the second front side earth point 19. In addition, the earth point 19 is provided at the position spaced by interval l to the battery 7 side in relation to the mounting position of the sensor 1.
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