Alarm Faulty Alarm and battery - Civinfo
 
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post #1 of 16 (permalink) Old 21st October 2013, 09:56 Thread Starter
 
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Faulty Alarm and battery

Morning all,

Hoping someone with a bit of knowledge may be able to help me out...

We have had a problem with our car alarm for the last week which has gradually got worse leading up to last night. Despite all doors, boot and bonnet being securely slammed shut. Sometimes the lights will flash with no sound for a couple of minutes, then the siren will sound with flashing lights. Last night was the worse it had been and after a while trawling around on here the only way i could leave the car unarmed was to open the bonnet with the car then remaining unlocked. I checked before leaving it that all interior lights had gone off and no illumination on the dash. Never heard a peep out of it all not as the alarm wasn't armed. Went to start it this morning and..... flat battery!!!

Tearing my hair out now as the battery shouldn't of run flat to my mind.

Can someone try and point out what the possibilities are?

I am aware of faulty bonnet sensors and adjustment of rubber boot stops but i am wondering if the 2 faults listed above may well be linked? Was going to try and have it plugged in today but wanted a heads up before trying anything...

All help appreciated.
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post #2 of 16 (permalink) Old 21st October 2013, 11:16
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It's possible the battery is the problem, low voltage at the battery is possibly setting alarm off. I would get the battery checked
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post #3 of 16 (permalink) Old 21st October 2013, 11:18
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Morning all,

Hoping someone with a bit of knowledge may be able to help me out...

We have had a problem with our car alarm for the last week which has gradually got worse leading up to last night. Despite all doors, boot and bonnet being securely slammed shut. Sometimes the lights will flash with no sound for a couple of minutes, then the siren will sound with flashing lights. Last night was the worse it had been and after a while trawling around on here the only way i could leave the car unarmed was to open the bonnet with the car then remaining unlocked. I checked before leaving it that all interior lights had gone off and no illumination on the dash. Never heard a peep out of it all not as the alarm wasn't armed. Went to start it this morning and..... flat battery!!!

Tearing my hair out now as the battery shouldn't of run flat to my mind.

Can someone try and point out what the possibilities are?

I am aware of faulty bonnet sensors and adjustment of rubber boot stops but i am wondering if the 2 faults listed above may well be linked? Was going to try and have it plugged in today but wanted a heads up before trying anything...

All help appreciated.
How old is the battery if its 5/6 years old it might be at its end of life and the low voltage is setting the alarm off
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post #4 of 16 (permalink) Old 21st October 2013, 11:19
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Great minds think alike lol
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post #5 of 16 (permalink) Old 21st October 2013, 11:31 Thread Starter
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Thanks lads. How is it best to tell the condition of the battery considering its currently flat. Im leaving work at 2 to get it started and can take a reading from multimeter but would this be a true reading as its possibly not fully charged?

Hopefully this makes sense...
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post #6 of 16 (permalink) Old 21st October 2013, 13:02
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Thanks lads. How is it best to tell the condition of the battery considering its currently flat. Im leaving work at 2 to get it started and can take a reading from multimeter but would this be a true reading as its possibly not fully charged?

Hopefully this makes sense...
You can't assess a flat battery. When you get the car started you need to do a quick voltage test to see if the alternator works OK (slightly revved, all headlights & HRW on, battery voltage should always stay well over 14v) then get the battery fully charged and see if the voltage stays up above 12.5v when left overnight. And, if it doesn't, then either the battery is knackered, or something is draining it (hands free phone is a common offender, or maybe a light staying on, or the alarm?). I'd check the alternator and the 'parasitic' drain current (there's a how-to vid clip somewhere on Civinfo) before I spent money on a battery, but obviously it could be the battery.
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post #7 of 16 (permalink) Old 21st October 2013, 13:12
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Any car accessary shop should be able drop test the battery using a drop test meter, eg Halfords
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post #8 of 16 (permalink) Old 21st October 2013, 13:46 Thread Starter
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Thanks again, makes sense. Either way i am best to solve the battery problem before challenging the alarm. Hopefully though the two will be related. Should i expect to see a manufacturing date stamped on the battery and if its 4-5 years old replace it anyway?
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post #9 of 16 (permalink) Old 21st October 2013, 15:25
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If the alarm goes off for no reason.
I think it is the Bonnet Sensor Switch.

It is prone to failure
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post #10 of 16 (permalink) Old 21st October 2013, 16:42 Thread Starter
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Update...... Battery was the original dated 2006, so I have bite the bullet and purchased a new one. Been fitted for 1 hour now and no alarm or flashing so hopefully its problem solved. I'm sure I'll be back on if that changes.

Thanks for all your help
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post #11 of 16 (permalink) Old 21st October 2013, 16:52
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If the alarm goes off for no reason.
I think it is the Bonnet Sensor Switch.

It is prone to failure
Off post I hope you keeping safe down in Aus. with the wildfires, unfortunately we can't send our rain down to you

Last edited by Xrv750; 21st October 2013 at 20:24.
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post #12 of 16 (permalink) Old 21st October 2013, 19:50
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Update...... Battery was the original dated 2006, so I have bite the bullet and purchased a new one. Been fitted for 1 hour now and no alarm or flashing so hopefully its problem solved. I'm sure I'll be back on if that changes.

Thanks for all your help
hope the battery sorts your problem
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post #13 of 16 (permalink) Old 22nd October 2013, 11:18
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Off post I hope you keeping safe down in Aus. with the wildfires, unfortunately we can't send our rain down to you
Fires are about 150km north west from me but the smoke from the fires is every where.

Cant see more than 1km due to the smoke haze.
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post #14 of 16 (permalink) Old 24th November 2013, 18:37 Thread Starter
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Right... Further problems with the alarm!

Having changed the battery I have had no problems for the last 4 weeks until now.
I have noticed when locking it recently that the indicators don't flash as they used to, which isn't a problem more an observation.
The alarm is now going off randomly, sometimes it will just flash intermittently, sometimes flash continuously with no sound and sometimes the alarm will sound.
Has anyone got any suggestions as I'm now tearing my hair out with this.
I'm not fussed if the alarm isn't set I just can't be doing with the hassle it's causing.

All help is appreciated....
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post #15 of 16 (permalink) Old 25th November 2013, 15:27
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Get the bonnet and boot sensor checked, mine came with a faulty bonnet sensor so got it changed
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post #16 of 16 (permalink) Old 25th November 2013, 18:56 Thread Starter
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Thanks for the reply, where are these located and how is best to test them?
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