815 ILCS 405/13
No provision in a retail installment contract under which, in the absence of the buyer's default, the holder may, arbitrarily and without reasonable cause, accelerate the maturity of any part of or all of the amount owing thereunder is enforceable.
No provision in a retail installment contract under which the holder may accelerate the maturity of any part or all of the amount owing thereunder is enforceable, unless prior to such acceleration, the buyer has been in default for at least 30 days or the buyer has abandoned or destroyed the property or the holder has reasonable cause to believe that the buyer is about to leave the state.
No provision in a retail installment contract relieving the seller from liability for any remedies provided by law which the buyer may have against the seller under the contract is enforceable.
No provision in a retail installment contract purporting to waive any of the provisions of this Act is enforceable.
815 ILCS 405/13