Sounds like there is an electrical probelm growing big. I'd look at your battery connections for curosion. Trace all the wires and check ou the relay box in your engine bay. I would check all your fuses inside the cabin too to see if any or blow. For the back doors I would take off the panels and check for broken linkages. there are these pastic connections at the end of the linkages that tend to break. The horn can also be the "clockwheel" in the steering well. but for now I would stick with the fuses to start with your door and electrical problems.
97SE-180*stat, Gutted Air Box, Green Air Filter, Rear Air Shocks
^Future^- HV3, Stage 2 Heads, L26 Upper, P&P LIM, LS6 VS, LS1 Retainers, N* TB, LQ4 Maf, CAI, 65-HD Trans, GT2 cam, SSEi sway ES links