What would keep the key from turning on a 1992 Plymonth Voyager?
IF the steering wheel was turned all the way, then turned off U will have 2 use some force 2 turn the wheel as 2 take the pressure off the locking mechanism- just hold down hard on the steering wheel & u should b able 2 turn the key.Try one way then the other-U will feel the resistance one way.
Try eBay! Just search for "1992 Plymouth Voyager manual", and check the listings for one that includes the Infinity supplement. If the radio is an OE radio, then the information is listed in the owner's manual. Don't have one, get one. Contact your dealer or a salvage yard. If it is a non OE radio, contact Infinity. Mine (a 91) has a separate sound system manual.