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Alarm goin off at 4am!!!

Discussion in 'Land Rover Discovery' started by foss, Mar 1, 2010.

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  1. foss

    foss New Member

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    Location:
    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:
     
    Last edited: Mar 1, 2010
  2. foss

    foss New Member

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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
     
  3. lerk

    lerk New Member

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    ultrasonic sensors can be unplugged quite easily afaik, although the single chirp on locking suggests one of the door/bonnet switches is acting up...
     
  4. foss

    foss New Member

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    cheers lerk.gonna try the bonnet sensor as when on most occasions ive had bonnet up it chirps.if i unplug ultrasonics will the alarm set and just work off the door sensors?
     
  5. Jon14

    Jon14 New Member

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    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
     
  6. foss

    foss New Member

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    will try that too.they must be spiders that love rain!
     
  7. biolandy

    biolandy Well-Known Member

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    Perhaps its the water falling inside tripping the alarm!
     
  8. landrovermilfer

    landrovermilfer Active Member

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    i had a similar problem turned out leaky sunroof was shorting out ultrasonics or whatever theyre called....
     
  9. 50 pence

    50 pence New Member

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    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.
     
  10. foss

    foss New Member

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    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
     
  11. Urban Panzer

    Urban Panzer New Member

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    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
     
  12. foss

    foss New Member

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    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
     
  13. Coffee Monster

    Coffee Monster New Member

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    Hey fosse, on the lighter side, bet you was in work a little earlier than normal.:)
     
  14. foss

    foss New Member

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    My boss thought i'd sh1t the bed!
     
  15. distd5co

    distd5co New Member

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    some of the things you mention their foss have to be coaded in the class/ non class items in the bcu it self.
     
  16. foss

    foss New Member

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    d'ya reckon i should still have it plugged in to check it?
     
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