Patent ID: 7568310

Claim:
An opening/closing system for vehicle, which automatically opens and closes an opening/closing member provided to the vehicle, the system comprising: a drive unit having a drive source and a reduction gear mechanism accommodated in a gear case, an output shaft for outputting a rotation of said drive source projecting from said gear case; a rotatable output member fixed to a portion of said output shaft projecting from said gear case and linked to said opening/closing member, and outputting power of said drive unit to said opening/closing member, a cable guide groove being formed in an outer peripheral surface of said output member; an electromagnetic clutch covered by said gear case and a clutch cover, and intermitting power transmission between said reduction gear mechanism and said output shaft; a case body provided with an output member accommodating section that covers said outer peripheral surface of said output member, the case body being fixed to said gear case; a magnet disposed between said gear case and said output member, and rotating along with said output member; and a magnetic sensor disposed at said case body so as to oppose said magnet and detecting a rotation of said output member from a change in a magnetic field created by said magnet, wherein a gap between said outer peripheral surface of said output member and said output member accommodating section is smaller than an outer diameter of a cable wound in said cable guide groove of said output member.