I know when i first got my 2005 Aveo LS my back up lights wouldn't work, i did a bit of research and you can get a reverse switch which should go right on the front of your transmission if you have a manual transmission. its not hard to find and is no more that $20 i believe. its an easy job to do yourself, you just unplug the wire from the switch, unscrew the switch, replace it with a new one and plug it back in!