Mich. Comp. Laws § 691.1686

Sec. 6. (1) An agreement contained in a record to submit to arbitration any existing or subsequent controversy arising between the parties to the agreement is valid, enforceable, and irrevocable except on a ground that exists at law or in equity for the revocation of a contract. (2) The court shall decide whether an agreement to arbitrate exists or a controversy is subject to an agreement to arbitrate. (3) An arbitrator shall decide whether a condition precedent to arbitrability has been fulfilled and whether a contract containing a valid agreement to arbitrate is enforceable. (4) If a party to a judicial proceeding challenges the existence of, or claims that a controversy is not subject to, an agreement to arbitrate, the arbitration proceeding may continue pending final resolution of the issue by the court, unless the court otherwise orders.