2008 vw beetle alarm keeps going off for no reason. Some are saying it's related to door sensor. Please elaborate?
Goes off at random times. Seeing references to door latch but trying to get more information on what exactly to do or request a mechanic to look into. Thanks
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Cars & Trucks Master
12,290 Answers
Re:
Factory alarm or after market add on, we can;'t see it
all alarms are just tiny CPU in a box programmed to be and alarm and as such any inputs failing causes and alarm.
doors. ajar switches. even hood,. hatches and trucks.
tampering,
shake switches ( I hate them)<< so do all neighbors.
some have sonic glass breakage sensors.
most cars (for sure this year) the factory alarm can seen as
DTC errors and be seen via the OBD2 port USA./ scan tool.
scan it or get the car serviced..
my car even shows the alarm cause in the CLuster display.
it went off For a reason, that is a fact
most alarms have a way to see logged errors.
if not I defeat the alarm, nobody ever listens to them or even LOOKs. ( everyone is sick of them)<< noise pollution.
good luck
PS read the service manual on the car, chapter ALARM
it has things to do , so read it.
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check make sure alternator charging battery if alternator fails volts out put 11.0 volts that will set off abs light, if alternator okay have vechicle abs brake system scanned at the volkswagon dealership.if abs light flashing while in motion could have faulty wheel speed sensor.
I had a similar problem with my expedition--where the lights would not go off, allowing me not to arm the vehicle. I had read that in high humidity sensors and or mechanisms tend to stick. To solve my problem I used some silicone spray in every lock mechanism--cycling the locks by opening and closing the doors several times after spraying the locks. I have to do this once or twice a year.
Hope this helps--
Did you have an accident with this vehicle shortly before this happened ?
I have had this problem after my car was repaired by a body shop. One door latch was replaced by the VW dealer which solved the alarm problem but the battery still drained. Now they are saying it is the comfort control module.
The drivers side door latch is bad. Just replaced one in my daughters 99 beetle. $184 dealer part. same thing no lights then alarm will mgo off for no reason, lights will come on at random times while driving, no chime when key is in.
My 2000 Beetle does same thing (although not all the time). Just found an internet post that suggests there is a problem in the door lock sensor. I assume you are using a regular key - not
the keyless entry - like I am. He also said that you can disable the alarm (also disables the
keyless entry - which doesn't bother me) by leaving the front door AND the rear trunk open and
starting the car up. Seems to work so far. I will get the door lock sensor replaced and turn the
alarm system back on (not sure how yet), and let you know if that stops the problem.
I found a thread - http://forums.vwvortex.com/zerothread?id=1542461 that details the repair of the soldering on the key lock door module. Our 2000 new beetle had the same issue. Also sometimes it refused to start. Soldering pins fixed it all.
I ripped the door apart and re-solderd the pins. I only had one pin with cracked solder but two others looked thin so I did them while I was in there. It's about a four or five hour project if you have all the tools. (8mm triple square also called an 8mm internal was the hardest to find - Also needed Torx T8 T10 T15 and T30 plus Philips Screw Driver. )
Project is difficult but not too bad for the mechanically inclined. A 7 on a scale of 10.
Since re-soldering pins - no more issues! My guess is that a VW dealer would get $200 for a new moduel plus 5 hours of service time for this gig - easily a $500 to $1000 bill. My cost - several new tools - about $25.00.
each door latch has a sensor one of those could be bad ( the ajar switch) Needs to be hooked up to a scanner at a dealership or a local mechanic may have a scanner that could help
the factory fit alarm is not voltage sensing .The best advice is to go to VW garage and get them to read the alarm causes,(they can check the last 4).this will give you a good idea where the fault lies.ie door lock mechanism,interior monitor etc..You cannot start looking for problem until you know alarm cause..
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