Existing law requires a court, on petition of a party to an arbitration agreement alleging (1) the existence of a written agreement to arbitrate a controversy and (2) that a party to the agreement refuses to arbitrate the controversy, to order the petitioner and the respondent to arbitrate the controversy if the court determines that an agreement to arbitrate exists, unless the court makes other determinations, including, among other things, that grounds exist for the rescission of the agreement.