1999 volkswagen passat car alarm factory installed system

try locking and locking the drivers door three times slowly ,if that doesnt work then its a dealer only job

If the alarm sounds twice when you lock the doors that means everything is O.K.

it probably isnt a factory alartm it most likly a dealer installed after market alarm or one of those chip type starter locks.look under dash for a little connector looking thing with wiers going to it NOT THE TRAPAZOIDAL CONNECTOR if it has that one you will have to reconnct the start wire that was cut to allow the thing to work [add on thing has failed] or look for wires that are not in neat order with splices to various things and a plastic box usually zip tied somewere under there. repair cut during installation start wire.
if it were a factory alrm simply lock and unlock door with key try all doors in case lock cyliner switch is bad on drivers door, also remote should do it to

I'm not sure if you have an aftermarket or factory alarm, but try this: hook up the battery and try unlocking/locking the door with the key. If you have a remote door lock, hit unlock/lock on that. I have come across a couple of cars this was all it took to stop the alarm, never tried with a VW though. Hope it works, good luck!

Your car thinks a door is open , thus the light stays on. When you lock the doors with the remote it activates the alarm system. 10 sec later it senses that the a door is open and alarm sounds.
I have a 99 passat as well and I just went outside to see where the switch on the door is. Can't see one anywhere , it must be inside the door (part of the latch mechanism). I tried to arm the alarm system by locking the doors with the remote while the door was still open , sure enough the alarm went off about 15 secs later.

some cars have a problem when you change the car radio it can trigger the alarm system the alarm may think that car was being stollen and kicked in the immobiser which would turn off the starter motor which is giving the affect the batts flat,, plus a lot of the ford and vauxhalls when this happens it also shuts down the fuel pump, or ignition ,, if you have the key pad to lock and unlock car use this a couple of times this can reset the system . if not it may have to go to the main dealer to do a computor check to find fault and may be 10 mins to put right ,, matdav69

the starter kill relay inside the module is malfunctioning. the module needs to be replaced and reprogrammed to the remotes.

if your unlocking the doors with a key and the engine is starting it wont have a key fob,if your opening the doors with the key and the alarms going off and it wont start then it will have a key fob

unlock driver door twice consecutively to deactivate the alarm.