Hyundai Elantra
 

Hi all I have a 2007 Hyundai Elantra in my shop with multiple issues, no central central either by button on key and in car switch, no Parker lights come on when selected on the combo switch also found that the two fuses for parking circuit have no power on them at any given time. Also power windows are unresponsive there fuse in the fuse box also has no power at any given time. I've already clocked up a few hours on this car and have had no such luck in finding a solution. Would anybody be able to help me out?

There is a black plug in the dash fuse
When turned one way, it puts the vehicle in travel mode
And disables several electrical systems to save the charge on the battery
When turned the other way, it allows the vehicle to work in normal mode
Have you checked on this plug?
It may or may not be this issue??