Interior lights, Non op Lights Options

[6gCelicaowner]

I noticed the night I bought the car that no interior lights were working save the key light, window light on drivers panel, clock and Radio.Have checked the fuses and all are good. The radio is an aftermarket unit and Im not sure how it was actually wired up since it was before me and if it would have anything to do with the lights not working. If anyone knows of this issue and what may be the cause please let me know. Thanks in advance...Mike