My son bought a 1998 Audi A4 Quattro 2.5 5 speed it is a great running car but the windows, sunroof and the door locks do not work (electric). We have checked all the power point and grounds and all seem to be good. He does not have a keyfob for the keyless entry. Can someone point me in a driction that I will not spend a lot of money to fix this problem?