1) ditto
2) can you pull any codes?
3) Are you sure the ignition switch is it self OK? Perhaps internals are shorted.
4) pull fuses: First open the small black box just forward of the larger box on the passenger side where the RCM, ECU and BCM are located. In that small box are three fusses that connect major components. Disconnect battery, then take two of them out. reconnect battery. Problem still there? No, disconnect battery and add one more fuse, reconnect battery. Problem there now? You are isolating problem to an area which will then be further explored. If the problem is isolated to the main fuse that powers the fuse box on the drivers side. Then start pulling fuses in the drivers side box to identify problem circuit.
4) Good Luck!