If the subdivision or site plan is unanimously approved with at least three members of the Subdivision and Site Plan Committee present and voting (only those who are members or alternates of the Board having jurisdiction to act, may vote), no further action shall be required of the Planning Board as a whole. If the vote is not unanimous, or if such committee has not been established, the minor subdivision or site plan shall be referred to the Planning Board. If a variance within the jurisdiction of the Planning Board is requested, the subdivision or site plan shall not be referred to the Committee but instead to the Planning Board as a whole.