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Author Topic: Disconnect battery and alarm goes off.. Help!  (Read 7044 times)

Offline robump

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Disconnect battery and alarm goes off.. Help!
« on: November 03, 2012, 12:24:49 pm »
Hi,

I disconnected the negative terminal on my battery to remove the stereo to fit a new head unit, however as soon as i take the terminal off the alarm goes off.

Does anyone know how to stop the alarm without having to reconnect the battery?

Thanks for your help!

Offline bacillus

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Re: Disconnect battery and alarm goes off.. Help!
« Reply #1 on: November 03, 2012, 01:07:12 pm »
Stupid question but was the car locked when you disconnected the battery?
Without traction power is nothing!

Offline robump

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Re: Disconnect battery and alarm goes off.. Help!
« Reply #2 on: November 03, 2012, 01:11:47 pm »
No it was unlocked with the doors open, hmmm really puzzling!

Offline bacillus

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Re: Disconnect battery and alarm goes off.. Help!
« Reply #3 on: November 03, 2012, 01:27:52 pm »
fwiw I didn't disconnect the battery when I changed my head unit. I also didn't disconnect the air bag wiring from the vent section so no air bag light on refitting.
Without traction power is nothing!

Offline robump

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Re: Disconnect battery and alarm goes off.. Help!
« Reply #4 on: November 03, 2012, 01:31:09 pm »
Ah ok, just i have been looking through all the guides and they say you should do, but is it possible to do it without diconnecting the battery? What could i break if u dont?

Thanks

Offline callis

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Re: Disconnect battery and alarm goes off.. Help!
« Reply #5 on: November 03, 2012, 02:45:30 pm »
Mine goes off if i dont fully unlock everything including boot.
05 GTI 5 Door, sunroof, met paint, 18" monza, Leather Anthacite, front centre armrest, xenon headlights, Lux pack 2, Sensors, Winter Pack.

Offline bacillus

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Re: Disconnect battery and alarm goes off.. Help!
« Reply #6 on: November 03, 2012, 02:52:33 pm »
Ah ok, just i have been looking through all the guides and they say you should do, but is it possible to do it without diconnecting the battery? What could i break if u dont?

Thanks

I think the reason folk disconnect the battery is because they unplug the air bag wiring and forget to plug it back in when the unit is installed, turn on the ignition and bam, the air bag light comes on in the dash.

You need vcds to clear the light.
Without traction power is nothing!

Offline robump

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Re: Disconnect battery and alarm goes off.. Help!
« Reply #7 on: November 03, 2012, 02:54:21 pm »
Ah ok, so if i dont disconnect that warning light wire then i should be ok?

Offline homesqueeze

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Re: Disconnect battery and alarm goes off.. Help!
« Reply #8 on: November 04, 2012, 10:35:30 am »
This happened when I changed my battery. As soon as I took the terminal off the alarm went off. Just use the key fob to turn it off. Press unlock when the alarm starts and it will go off. This did the job for me. It also went off when I reconnected battery again. Same applies for that.  :happy2:
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Re: Disconnect battery and alarm goes off.. Help!
« Reply #9 on: November 05, 2012, 06:07:29 pm »
Ah ok, just i have been looking through all the guides and they say you should do, but is it possible to do it without diconnecting the battery? What could i break if u dont?

Thanks

I think the reason folk disconnect the battery is because they unplug the air bag wiring and forget to plug it back in when the unit is installed, turn on the ignition and bam, the air bag light comes on in the dash.

You need vcds to clear the light.

/\ /\ /\ /\

I agree with this fella... I have fitted a new head unit and didn't disconnect the battery, Just make sure you DO NOT turn the ignition on until everything is plugged back in  :wink:

Offline BlackGTI

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Re: Disconnect battery and alarm goes off.. Help!
« Reply #10 on: November 05, 2012, 07:43:40 pm »
x2

Offline daboy3000

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Re: Disconnect battery and alarm goes off.. Help!
« Reply #11 on: November 06, 2012, 12:18:02 pm »
Don't you just turn on the ignition 1 step and then disconnect the battery.  Something like that anyway.

Offline robump

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Re: Disconnect battery and alarm goes off.. Help!
« Reply #12 on: November 09, 2012, 10:58:52 am »
Thanks for all your help.. gonna give this a try today so will let you know how it goes.