I don't know if this will help but last weekend when I plugged in my radar detector into the cig lighter, the plug had a short and blew out the circuit. So now the radio is dead along with the power antenna and cig lighter. I checked the radio fuses at the radio and at the fuse panel(I think it was the #4 fuse) and they were fine. Then I opened the trunk up and the trunk light did not go on. Hmmmm! I checked the #11 fuse and sure 'nuff, that 15 Amp fuse was cooked. I replaced it and now I have my tunes back. I know my 91 Oldsmobile is not the same as a 90 Bonneville, but we are first cousins. So my question to you is, did you check ALL the fuses??
2006 Salsa Vibe
2002 Snap Orange Beetle - Turbo
1991 Olds "Orphaned" 88 - Donated to Science!