Question about 2000 Volkswagen Passat 4Motion

1 Answer

Alarm draining battery overnight when on

VW 2000 115 BHP diesel - factory fitted alarm, mechanic attempted to disconnect entire alarm but failed, can alarm be disconnected and maintain central locking?

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 2 Answers

I've had the same problem be fore on 99.5 jetta most likely one of the door sensors if that helps you at all

Posted on Jan 01, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

The car soulds like the battery is low but when it starts the flashers come on.


Often an alarm system will register a low battery voltage and presume the vehicle's battery is being removed to prevent the alarm from going off. They will then begin flashing and or sounding the horn.
In your case, I would presume that the battery voltage is too low which may indicate either a failed battery, or a parasitic voltage drain.

First, get the vehicle started, and run the vehicle for a good twenty or so minutes to get some charge to the battery. If you don't want to waste fuel however doing this, then I suggest using any battery charger, as all we want to do is get some voltage back in the battery. If you are using a charger though, then charge on a lower voltage setting overnight.

Once you have the battery charged, run off any surface charge by turning the vehicle lights on for a minute, then turn them off again.

You need an ammeter for this next part:


Disconnect the battery positive terminal and connect the ammeter in series with the battery and positive lead.
DO NOT ATTEMPT TO START THE VEHICLE!

With all vehicle systems off, the key out, doors closed and alarm 'OFF', bonnet close switch depressed, or bonnet/hood clasp closed (need a screwdriver), take a reading from the ammeter.
After probably no more than twenty minutes, the ammeter should be reading 0.03 amps and not much more. Anything like 0.5 or 1 amp means you have a battery drain.
If this is the case, then start by disconnecting the alarm system. If the alarm system has it's own separate speaker/horn, then disconnect this first. Many of these horns have backup batteries, which only last three or four years before they fail, which causes them to constantly draw from the vehicle battery and then flatten it when parked.
Every time you disconnect an item or system, check that ammeter again to see if the amps have returned to normal. Pull fuses one by one, checking the ammeter each time for any change until you find the system which is causing a drain, then attend to that system.

If your amps are normal however and your battery is still loosing charge when parked for any short length of time, i.e. a few days or so, then your battery is at fault and requires replacement.

Just before changing your battery, do one last check, which is with the vehicle running. You need to reconnect any battery cables, and start the vehicle. Using the voltmeter once more, check the voltage across the terminals with the engine running. This is your charging voltage and it should go up to around 14 volts if revving the engine slightly. If still around 12 volts only, then you have a charging issue, which is probably the alternator.

Nov 11, 2012 | 2008 Toyota Corolla

1 Answer

Alarm goes off even after unlocking with remote


If the alarm has a siren with a backup battery, then check the condition of the siren battery. Is it drawing a large charge (drop in amps from the battery. Run a parasitic drain test). If so, then the siren could be at fault.

Is the alarm fitted with a sonic motion detector? Looks like two tiny speakers in a unit fitted in the centre of the dash. If so, this unit could be faulty.

Many after market alarm systems by the way, tend to only last for a few short years before failing. Is this an aftermarket product or factory?

Nov 03, 2012 | 2005 Jeep Grand Cherokee

1 Answer

What would drain the battery overnight,every morning car is dead. two mechanics can't find anything


If the battery doesn't have a bad cell in it then double check any direct hot wires that lead from the battery directly and disconnect any that are not needed. Typically an alarm will do this if the alarm is malfunctioning. On rare occasions a vehicle radio secondary power line will cause this to happen.

Sep 30, 2010 | 1985 Ford Mustang

2 Answers

Didn't know my 93 vw golf had an alarm, now I had to disconnect the battery to shut if off.. what do I do to fix this?


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!

Feb 28, 2010 | 1993 Volkswagen Golf

1 Answer

Battery ran flat on my 'R' reg VW Golf gti while I was away in Australia. The alarm was disconnected a couple of years ago but now the immobiliser seems to have triggered as there is no spark or petrol...


sometimes it depends on the type of allarm, if it is factory fitted they are a nightmare to do as most of the wireing for the allarm is intergrated into the loom, where as if it is an after marked alarm ( one fitted later on ) it shouldnt be to bad but still a long and complicated job to find all the wires and reconnect the originals bypassing the immobiliser/alarm if you are a complete novice this should not be attempted as you could immobilise the car completely, best thing for you to do is get an auto electrician to have a look at it for you, sorry its not much help

Feb 15, 2010 | 1999 Volkswagen Golf

1 Answer

I cannot stop my ford streetka alarm from going off


Locate the fuse and or pwer supply, must be direct of the battery, disconnect either.You said the alarm is replaced in the boot, than the power wire to the alarm is located their.Disconnect it, tape off the end and stow.

Jul 23, 2009 | 2005 Ford Focus

1 Answer

97 vw jetta w/aftr mkt. alarm drains battery and disarms on own?


My friend you are faced with a catch 22 problem. The first thing I would like to know is, who installed the alarm system? Did you do it or was it professionally installed. If it wwas professionally installed I would go right back there and discuss the problem with them. It very well could be a defective unit. If you did not have it installed professionally I would disconnect the alarm and see if your battery still get's drained.If so, then the alarm is not the culprit, and you have some hunting to do. If not then you have some testing to do.Next what type of alarm is it? Try to google it. You may be able to find a trouble shooting guide to assist you. I know that you said you just replaced the battery, but the alarm very well may not be the culprit. It could be many other things as a loose fanbelt, bad diodes in your alternator, or some other componet draining your battery.

May 10, 2009 | 1997 Volkswagen Jetta

1 Answer

Turn off alarm system for 1997 mercury sable


If this is a factory alarm all you have to do to turn it off is put your key in the door ,lock it then unlock it . if its not a factory alarm you will need the remote or have the entire alarm unhooked by a mechanic

Mar 24, 2009 | 1997 Mercury Sable

1 Answer

Have a viper alarm installed and a factory alarm


try removing the remote fob battery for 10 secs then replacing, i get this problem a lot if the fob battery is low.

Feb 25, 2009 | 2007 Toyota Tacoma

2 Answers

Battery drain 200 jetta diesel


Hi if you are getting a 1 amp drain with everything switched off thats too much the maximum drain should be no more than 50 miliamps try pulling fuses one at a time to check which circuit is affected  if no joy disconnect alternator cables or plug (not with engine running!) tell me if this helps

Jan 04, 2009 | 1999 Volkswagen New Jetta

Not finding what you are looking for?
2000 Volkswagen Passat 4Motion Logo

407 people viewed this question

Ask a Question

Usually answered in minutes!

Top Volkswagen Experts

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

yadayada
yadayada

Level 3 Expert

61168 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

Are you a Volkswagen Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...