Mitsubishi Repair: Master key, jetta 1, front doors

Question
Pleas help me.My VW 2003 Jetta 1.8T has a problem . I can open the driver front doors using the keybotton, but when I try to double-click the unlock botton key to open all locks, nothing happens. When I try to use the door buttons on the interior to open the locks-its work fine.Or double-turn Master key-it is works good.   

What needs to be done???  

Answer
Nikolai: I would say you need to take your car to either a dealership or shop; as I think you might have a sensor out that controls the unlocking of the doors using your keybotton. As your car is not that old so that might be your problem. But a dealership or shop would be able to address that better for you. I am sure it is nothing to hard to fix. Hope this helps you some and good luck! Linda