(a) A defendant has the right to suppress the use of a prior conviction that was obtained in violation of his right to counsel if its use by the State is to impeach the defendant or if its use will:
(1) Increase the degree of crime of which the defendant would be guilty; or
(2) Result in a sentence of imprisonment that otherwise would not be imposed; or
(3) Result in a lengthened sentence of imprisonment.
(b) A defendant who has grounds to suppress the use of a conviction in evidence at a trial or other proceeding as set forth in (a) must do so by motion made in accordance with the procedure in this Article. A defendant waives his right to suppress use of a prior conviction if he does not move to suppress it.
(c) When a defendant has moved to suppress use of a prior conviction under the terms of subsection (a), he has the burden of proving by the preponderance of the evidence that the conviction was obtained in violation of his right to counsel. To prevail, he must prove that at the time of the conviction he was indigent, had no counsel, and had not waived his right to counsel. If the defendant proves that a prior conviction was obtained in violation of his right to counsel, the judge must suppress use of the conviction at trial or in any other proceeding if its use will contravene the provisions of subsection (a).