I have been using the instructions in the owner's manual but the openers won't work. I appear to have a rolling code door opener, but the doors won't open when I follow the instructions for the rolling code doors. It says to push the Homelink button twice then the door should open, if not push it a third time. Does the car have to be in the garage under the motor for it to work? How long should I hold the button down between pushes? Any help would be appreciated! Thanks