Cal. Bus. & Prof. Code § 26225

Each association shall, within 30 days after its incorporation, adopt for its government and management, a code of bylaws, consistent with this chapter. The vote or written assent of shareholders or members that hold at least a majority of the voting power is necessary to adopt the bylaws and is effectual to repeal or amend a bylaw, or to adopt an additional bylaw. The power to repeal and amend the bylaws, and adopt new bylaws, may, by a similar vote, or similar written assent, be delegated to the board of directors, which authority may, by a similar vote, or similar written assent, be revoked.