Tello
How are the hinges? If the door drops down when opened, then the hinges are worn out. If the hinges are fine, then adjustment to the striker/bolt assembly is needed. This is very simple, and once you take a look at it, you'll see what to do.
The striker adjustment is very sensitive. The door ajar switch is in the latch mechanism on the door and if the striker is not adjusted perfectly, the switch will not function. My 1997 has a double latch, yours probably does also. Try adjusting the striker closer to the pilar. That should tighten it up enough to make the door ajar switch function. If not, just keep adjusting it until you get the light to go out. It took us 3 tries to get it.
wd40
Nader pin is the pin in the door jam that the door latches on to, to close. It is also called a door striker pin.
Adjust the striker if door otherwise aligned ok.
Have you tryed to put a screwdriver in the "hole" where the door striker would go and as you pull the handle up push the screwdriver out. As if you were going throught the motions of the door opening but the screwdriver acts as the striker.
Almost all modern commercially produced door handles can be installed on either hand. The internal mechanism, known as the striker, flips over and is identical top and bottom. Door handles have spindles that slip through a square slot in the striker mechanism so that when the knob is turned, or button pushed, the striker is withdrawn, allowing the door to open. Deadbolts are similarly constructed.
Loosen Nadar pin and move, BUT DO NOT REMOVE
To avoid frictions and also prevent from damage of an insects
Comfortable
the door striker needs adjusted along with possibly the latch mechanism.