1996 Saturn SC1 electrical

Do u have a factory radio or aftermarket?

It is a after market radio, pioneer. Plays beautifully until I turn on the lights, then all that I get is noise from the speakers. When I turn off the lights the radio shuts off. I have to restart the car to get the radio to play correctly again. Checked wiring diagrams, it is connected correctly

sounds like the wiring is messed up somewhere here is a wiring diagram for the radio i would start by checking where the park lamps are feeding into the radio because that wire powers up with headlights on.if ur wiring is good then the only thing else u have left is a bad radio.but it sounds like wiring to me.let me know what u find.