Cal. Veh. Code § 3010

Five members of the board shall constitute a quorum for the transaction of business, for the performance of any duty or the exercise of any power or authority of the board, except that three members of the board, who are not new motor vehicle dealers, shall constitute a quorum for the purposes of Article 4 (commencing with Section 3060) and the consideration of a petition pursuant to subdivision (b) of Section 3050 that involves a dispute between a franchisee and franchisor.