The Mopar DRB scanner will tell you more but I always like to take my Fluke meter and measure the voltage of the plus and minus bus circuits and see if its shorted to ground or shorted to volts which is easy to see. Could also have an open somehwere and if at the controller that bias's the volts it will be a dead bus. Some CCD vehicle's have 2 controllers that bias the bus. You can also try unhooking controllers one at a time to see if one is taking the bus down. I had some trucks but I dont remember what years that got water in the ABS controller conector so you may also want to check that. Ron