Whilst tinkering with my cars settings I lost use of the reversing camera. I left the car for an hour or so to see if it reset - no help. I left the car for several hours and bingo the computer must have fully switched off and rebooted. My question - How can I get the inbuilt computer to restart the settings without a long wait. One post on another subject said disconnecting the battery and touching the cables together would reset the engine but not other controls. If that is the method, do you really need to short the cables?