Mich. Comp. Laws § 88.17

Sec. 17. A person appointed to office by the council under this act, may be removed from office by a vote of the majority of the aldermen elect. The council may remove from office an alderman by a concurring vote of 2/3 of all the aldermen elect. For elective officers other than aldermen, provisions shall be made by ordinance for preferring charges against and trying these officers. Removal of an elective officer other than an alderman shall not be made except by a 2/3 vote of all the aldermen elect and unless a charge in writing is preferred and an opportunity given to make a defense to the charge.