65 ILCS 5/5-3-1
In cities which do not elect to choose alderpersons from wards and in cities which elect to choose councilmen as provided in Sections 5-2-18.1 through 5-2-18.7, the mayor shall have the right to vote on all questions coming before the council but shall have no power to veto. The mayor and president shall be recognized as the official head of the city or village by the courts for the purpose of serving civil process and by the Governor for all legal purposes.
The mayor or president of any city or village which adopts this Article 5, other than one which at the time of adoption was operating under or adopted the commission form of government as provided in Article 4 or which does not retain the election of alderpersons by wards or trustees by districts, shall have veto power as provided in Sections 5-3-2 through 5-3-4, and ordinances or measures may be passed over his veto as therein provided. Such mayor or president shall have the power to vote as provided in Section 5-3-5.
If any other Acts or any Article of this Code, other than Article 3 or Article 4, provides for the appointment of a board, commission, or other agency by the mayor or president, such appointments shall be made in manner so provided.
65 ILCS 5/5-3-1