Can't disarm the alarm on 2000 volkswagen passat with key...All I have is the key where you push the button and the key flips out but the half with the keypad is lost so I just have the flip out part. when I tried to unlock it the first time with it it would unlock but the alarm would go off when I tried to start the car..then somehow it worked for 2 days and now It's doin it again..what am I doing wrong?

SOURCE: 2000 Passat Car Alarm won't work with keypad

The micro swith in the lock assemlby gets dirty and can break. if you are hand look into the door latching set up if not need to replace the the assembly.

SOURCE: 1999 volkswagen passat car alarm factory installed system

Do you have a key fob? Unlock the car with that and you should be OK. My sons Elantra is the same way, you can only get in with the fob. I guess the car thinks it's being stolen otherwise. If you don't have a fob, I'm no help

SOURCE: 2001 jetta alarm doesn't disarm when i unlock my car

you can buy a factory vw key on ebay and have the dealer program it to your alarm. i had to do it that way when my key broke. it is cheaper than a new one from the dealer. type 01 jetta factory key on ebay.

SOURCE: 2000 VW Passat won't start/car alarm goes off/stuck in anti-theft

My car, 2000VWPassat, is doing exactly the same thing as of Wednesday April 7, 2010. The dealer has been looking at it for 6 hours and they said they have absolutely no clue what is happening. They are elevating it to an "engineer".

SOURCE: my volkswagen passats power windows/doors/trunk

check fuses for windows, central locking etc. control unit for these components located under carpet in left front foot well.check for water ingress into foot well as it will damage control unit.