On the Kenwood, left side, below the screen there are three buttons - two round buttons and one rectangular, slanted button.  Push the center button labeled "AV Out".  Now push the joystick to the left.  If that doesn't work right off, then try a couple combinations of pushing that "AV Out" center button and the joystick - button first, then joystick and joystick first, then button.  I don't remember exactly which combination made mine work.