Michigan Compiled Laws, Chapters 760 to 777 Code of Criminal Procedure § 774.18

Sec. 18. If the police officer to whom the venire is delivered fails to return the venire as required, or if the jury fails to agree and is discharged by the municipal court, a new jury shall be selected and summoned in the same manner and the proceedings shall be continued as prescribed in sections 12 to 17 of this chapter,  1 unless the accused consents to be tried by the court. If the accused consents to a trial by the court, the municipal court shall proceed to the trial of the issue as if a jury had not been demanded.