2011 Suzuki Grand Vitara "bypass radio code jeep" Questions

...radio and wipers and all external lights. As far as the guage issue it is most likely a problem with the body control module, have a trouble code test run on the BCM to determine the issue, the ...

radio, all the accessory lights come on when I turn thekey, but nothing happens beyond that. Can anyone tell me what might bewrong and how do I troubleshoot it? Could it be the crank sensor andhow can