you have to make sure all fuses are good and make sure park neutral switch it ajusted right. on the park neutral switch the plug that has 7 wires going to it. check the 2 wires that control the rear back up lights one is pink the other is green. on the plug the green wire that is in the middle of the 3 wires on the plug. now the pink wire on the plug is hot with the key on, take a jumper wire and connect those 2. to make sure the lights come on (back up lites). then is either in the plug or the park neutral switch.