This is the problem I had too. I have a 1998 Chevy Malibu - tail lights do not work - dash panel dimmer does not work and service vehicle soon light is on. It all went wrong when I replaced a tail light. The brake lights, turn signals, headlights all work. I solved it by replacing the 15 amp fuse in the Fuse Relay Center under the hood labeled 45 - Park LPS. There was a spare amp in the drivers side fuse panel. The Service Vehicle Soon light went off. The dash lights work again (after I turned them up). All but one of the tail lights work again. I'm good with three out of four tail lights working. I fear if I try to get the fourth one working I'll blow the fuse again and have to go through this again.