Do you have an under the hood light? Check at night to see if it's on. Is your power outlet/lighter plug supplying power when ignition is off? If it is, try pulling that fuse. Do you have a security system? Try locking the door with the key, not the fob or power door lock. On my 05, using the power lock switch activates the security system also. Do you have a glove box light? make sure that is going out. Cargo lamp off? Night time is the best time to check for lights that shouldn't be on. Must be something not controlled by the ignition switch, unless the ignition switch is bad. Or maybe the clockspring.