Alarm goin off at 4am!!!

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foss

foss

New Member
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The muddiest driveway in Essex
(early) Morning all
I was just awoken , & half of the town, by my alarm belting it out so off I ran, jack handle in hand to beat the fool but all was fine, thankgod.
However, i am slightly confused.
I had a new BCU 8 weeks ago & he tech set the alarm to horn rather than sounder-its an air horn so rather loud!
All was fine at 10pm last night
The car will unlock with the key & disable immobiliser.It wont lock with the key.It will unlock all doors with key in the door but only locks the drivers door....hmmmm
It was very wet yesterday & there is now a frost which had always caused me probs before the new BCU.
Anyone any ideas?
NB...my air horn compressor is on the roof with the horns...is it poss the damp has caused a short across the compressor terminals? But then this wouldnt explain why the car unlocks fine off the fob but doesnt lock it...:doh:
 
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when i also tried locking off the remote the alarm beeped once at me like a door wasnt shut. gonna go for a long drive with the heater on to try and dry out the condensation.then silicone round both sunroofs
 
ultrasonic sensors can be unplugged quite easily afaik, although the single chirp on locking suggests one of the door/bonnet switches is acting up...
 
Any wildlife in your Disco?

I had a problem with the alarm going off on the mini a while back (has one of the ultra doodah sensors built into the headlining)... turned out to be a little tiny spider living up in the roof who came out at night and started web spinning!! :eek:

Bought some insect spray (RAID) and gave the car a good spray all round and under the seats, been fine since :D

Jon
 
Mine went off a couple of times once in the night. I thought, " ere we go ". Turned out to be big old fly in the cabin !. ( glad I got it out before it had smashed the steering lock of and had the motor away !! ).

Del.
 
Well Ive had chance to go over the old girl after work...poss faulty replacement BCU or a related fault Im guessing at for now...

-Still chirping when trying to lock with fob
-Fuel flap release inoperative
-No fogs front & rear
-No heated rear screen
-No rear wiper
-No rear wash
-No windows working
-No courtesy lights when opening any door
-Doors no longer self lock over 5mph

Immobiliser is arming...I have to lock 4 passenger using the interior dash switch, then lock the drivers with the key....

Any thoughts anyone (its being plugged in wednesday)

cheers
 
MM strange one tbh, but it would "point" to either a faulty BCU or one of the door switches, its the alarm "chirp" when trying to arm and the lack of courtesy lights that makes me think that one.

It "may" be a case that the BCU has had a power spike and lost all its configs and is a little "confused", would need to be plugged in to see if the settings could be "reset" and go from there.

I do believe "if" the windscreen is leaking it finds its way to the BCU, and it's possible any number of problems could arise from water ingress. I don't think the BCU has any diagnostic trouble codes, so it may well be difficult to determine the exact fault
 
Cheers UP,
it seems ive cured it...i picked up a thread on another site somewhere that had a guy describing exactly the same symptoms...
His was a faulty electronic door latch which has the alarm sensor built in in each door.
I already had the drivers done last year & the rear door...but I thought the bonnet sensor must be part of the same system & was only £18. The old one was rather knackered-rubber boot hanging off, full of Saharan scum still!
POT LUCK-it works fine, everythings back to normal.
One job that didnt cost 3 figures for once :D:D

Thanks everyone for all your thoughts

Foss
 
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