735 ILCS 5/15-1602
In any foreclosure of a mortgage executed after July 21, 1959, which has become due prior to the maturity date fixed in the mortgage, or in any instrument or obligation secured by the mortgage, through acceleration because of a default under the mortgage, a mortgagor may reinstate the mortgage as provided herein. Reinstatement is effected by curing all defaults then existing, other than payment of such portion of the principal which would not have been due had no acceleration occurred, and by paying all costs and expenses required by the mortgage to be paid in the event of such defaults, provided that such cure and payment are made prior to the expiration of 90 days from the date the mortgagor or, if more than one, all the mortgagors (i) have been served with summons or by publication or (ii) have otherwise submitted to the jurisdiction of the court. When service is made by publication, the first date of publication shall be used for the calculation. Upon such reinstatement of the mortgage, the foreclosure and any other proceedings for the collection or enforcement of the obligation secured by the mortgage shall be dismissed and the mortgage documents shall remain in full force and effect as if no acceleration or default had occurred. The relief granted by this Section shall not be exhausted by a single use thereof, but if the court has made an express written finding that the mortgagor has exercised its right to reinstate pursuant to this Section, such relief shall not be again available to the mortgagor under the same mortgage for a period of five years from the date of the dismissal of such foreclosure. The provisions of Section 9-110 of the Code of Civil Procedure shall be inapplicable with respect to any instrument which is deemed a mortgage under this Article. The court may enter a judgment of foreclosure prior to the expiration of the reinstatement period, subject to the right of the mortgagor to reinstate the mortgage under this Section.
735 ILCS 5/15-1602