Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Do you notice any change at all when the key is in off position versus when in start position? like accesories and interior lights and stuff? or does it stay the same?
That's an indication the ignition is fine then and the problem is elsewhere.
Since you don't have remote start, better check the drivers body harness for any damage. I have seen run over debris in the road and damage teh body harness which causes it to go to constant ground and the engine will not turn off.