All codes on

I'm new at this, so please bear with me. I bought a salvaged 2005 Prius and have driven it 30,000+ miles. I left a door ajar for ten days and killed the battery(ies). To get the car to start, I jumped it with another car and things worked fine, but I did not let the battery(ies) charge enough before shutting it off and had the same dead battery (no lights, horn, indicator lights, anything electrical) the next day and jumped it again. This time, only the driver's windows would work, ALL of the warning lights came on, the climate control, power steering, speedometer, and engine cooling fan did not work. But the radio works as do the lights and wipers and the car still runs in both electric drive and gas engine drive and switches over flawlessly; I've noticed no difference in the brakes (the ABS warning light is always on now) and I've since driven the car over 1000 miles while seeing about a 1 mpg drop in mileage (43 now). I took it to the dealer and made them aware of the problems and what I believe to be the cause--in April. I picked the car up in Sep from the dealer--four months after I dropped it off--because the dealer could not find out what was causing all the problems (they had two service guys look at it and another guy from somewhere in the Toyota hierarchy without satisfactory results). I'm at a loss as to what to do. Suggestions please. I cannot leave it at the dealer for another four to six months as I need the car for transportation every week.