Operational problems are easier to correct than installation problems. Begin with the remote control. If the remote does not seem to control the system, replace the batteries and try using it again. Order a replacement remote for your system if this does not work. Check the DVD being used to make sure it does not have scratches, cracks or other damage. If the player turns on but does not show a picture, make sure the brightness level is not set too low. Some DVD players will not operate properly at a low temperature, though they may work fine when the car is warm.