morning gents.2008 chrysler 300c, drove to a customers home to give an estimate and returned to my car and the remote wouldnt unlock the door. the customer had a extra fob battery and i installed the new battery and nothing! wont unlock or do anything, tried to start the car and nothing. how to test the fob to see if its transmitting to know where my issue is, the fob or the car's modual? i went to advanced discout and autozone to see if they had the little box that test the fobs but none of them has that anymore! any ideas on this?