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Author Topic: Dodgy alarm??  (Read 12022 times)

knh316

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Dodgy alarm??
« on: June 14, 2016, 10:21:46 PM »

Evening,
Just wanted some thoughts as to what might be going on with my 1.3 smart alarm/immobiliser. For the past 3 nights around about 9.30 - 10.00 my car alarm goes off. No-one or nothing is near it, all windows are closed as are all doors. I reset it and then it seems fine. It doesn't go off during the day, well i don't think it does because usually it'll do a couple of short beeps when I unlock it, which it doesn't do...Any ideas??
Thanks, Tina
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Brabs

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Re: Dodgy alarm??
« Reply #1 on: June 14, 2016, 11:24:38 PM »

Tricky one eh? Some time back, when I had a different car I had a similar situation. Turned out to be a spider making a web across the internal alarm sensors... which on the forfour are on the inside of the passenger 'B' pillar. Worth a look.

 ;)
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I did, to a generation 1 forfour 1.1 with 'Passion', a Silver generation 1 forfour 'Brabus' Xclusive and a fortwo 451 'night orange' edition ;~)

Problemchild

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Re: Dodgy alarm??
« Reply #2 on: June 14, 2016, 11:26:57 PM »

agree - normally something in the car..... especially at this time of year

give the interior a good hoover out

can also try pulling the fuse for 30secs and replacing

JJ

CrazyG

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Re: Dodgy alarm??
« Reply #3 on: June 14, 2016, 11:31:10 PM »

It could be down to the interior cooling down as a lower
or faster rate than the outside...causing thermals inside
the car which then sets off the interior sensors.

Sound's daft, but it does happen.
It's like a car windscreen..it can be fine during the day but
crack/split at a tiny stone chip when the temperature changes
between the inside and outside of the glass.

Anyway...to test this out....on the centre dash switch panel
are 2 images of little cars...one level (for the internal sensors),
and one tilted up (for vehicle towing/being jacked up..as in stolen).
As you exit the car press the 'level car' button and it will start to
flash.
Close the door/s, arm the alarm, and see if it goes off as it has been.
If it doesn't work..let us know and we'll see what else we can come up
with to help, ok.
PS...I press that button if I park in an area where there are heavy
lorries rumbling by...or buses ..of noisy area's like near an airport
or railway station/tracks etc, as those things trigger the alarm to go.

But try all the suggestions...you never know which one it might be. ;)
« Last Edit: June 14, 2016, 11:32:14 PM by CrazyG »
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454 - Brabus (mapped, Willwood brakes, coilovers etc)
454 - Passion CDi 95hp (manual, Brab body kit, coilovers etc)
454 - Passion 1.3 (manual, Brab body kit, lowered etc) [SORN'd]
451 - Pulse Turbo [my daily drive] (mapped, coilovers etc)
450 - 'Widestar' bodied Passion 700cc [SORN'd]