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Thread: Immobiliser/alarm Bypass.

  1. #1
    Apprentice jello's Avatar
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    Default Immobiliser/alarm Bypass.

    Hi Guys

    I have a problem with my immobiliser/alarm. here are the symptoms.

    1.When locking with the fob it takes round 20 min before the alarm goes off. I have locked it with the key (single lock not double) and all seems to be fine. So i suspect its the Volumetric Sensor as single lock disables this. Is this a correct diagnosis?

    2. Today I had an immobiliser problem. I unlocked using the remote fob and the dash light stopped blinking (as usual) when turned to position 3 no turn-over of the engine. I tried using the overide method with the key in the drivers door (as this has worked before) and still nothing. I took the time to take a few notes, all the electrics work (central locking, window, radio, lights, everything), I can hear the fuel pump in the rear start, but nothing from the starter solinoid. And after 3 hours and many attemps she started fine. I then allowed the immobiliser to kick in again another 5 times and she started fine. this has been happening on and off all day and a week back in April.

    Now to help remove some suspects.
    I have new batteries and syncronised both fobs and used both keys....no differance. (fobs are for Cent Locking as I already know) I have the old style bendy key so I dont know if it is chipped but this shouldnt make a differance as both dont function.
    I have checked all fuses and they are all intact.

    After doing a fair amount of reading on forums I would like somebody help me eliminate or suggest some causes.

    Could It be:
    the control unit for the alarm (behind the drivers instruments)?
    any of the relays?
    poor earth?
    the passive reader in the ignition or the ignition?

    Maybe its just easier to buy a whole new system or just bypass it for once and for all and just leave the cental locking system.

    Any advice would be great as I could start eliminating any suspects and get too the true problem maker.

    Sorry for the long post and thanks in advance.

    Dean
    2000 1.8 3dr Hippo, Epsom Green.
    2001 TD5 Discovery II, Oxford Blue.
    2006 TD5 Defender 110, Java Black.

  2. #2
    Apprentice freebe's Avatar
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    Default Re: Immobiliser/alarm Bypass.

    hi had the same prob with mine i replaced the centrel control unit which i got from the scrap yard for £60 and it cured the problem
    subaru pickup/ dihatsu fourtrack/isuzu trooper/ discovery 1/ toyota hilux pickup/landrover freelander

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    Apprentice jello's Avatar
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    Default Re: Immobiliser/alarm Bypass.

    Thanks for the reply.

    If I got it right I need to replace the central conrtol unit the one that sits behind the drivers instruments.

    Would I have to reprogram the fobs and the keys?

    Dean
    2000 1.8 3dr Hippo, Epsom Green.
    2001 TD5 Discovery II, Oxford Blue.
    2006 TD5 Defender 110, Java Black.

  4. #4
    Freelander Specialist Chaser's Avatar
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    Default Re: Immobiliser/alarm Bypass.

    Quote Originally Posted by jello View Post
    Hi Guys

    I have a problem with my immobiliser/alarm. here are the symptoms.

    1.When locking with the fob it takes round 20 min before the alarm goes off. I have locked it with the key (single lock not double) and all seems to be fine. So i suspect its the Volumetric Sensor as single lock disables this. Is this a correct diagnosis?

    2. Today I had an immobiliser problem. I unlocked using the remote fob and the dash light stopped blinking (as usual) when turned to position 3 no turn-over of the engine. I tried using the overide method with the key in the drivers door (as this has worked before) and still nothing. I took the time to take a few notes, all the electrics work (central locking, window, radio, lights, everything), I can hear the fuel pump in the rear start, but nothing from the starter solinoid. And after 3 hours and many attemps she started fine. I then allowed the immobiliser to kick in again another 5 times and she started fine. this has been happening on and off all day and a week back in April.

    Now to help remove some suspects.
    I have new batteries and syncronised both fobs and used both keys....no differance. (fobs are for Cent Locking as I already know) I have the old style bendy key so I dont know if it is chipped but this shouldnt make a differance as both dont function.
    I have checked all fuses and they are all intact.

    After doing a fair amount of reading on forums I would like somebody help me eliminate or suggest some causes.

    Could It be:
    the control unit for the alarm (behind the drivers instruments)?
    any of the relays?
    poor earth?
    the passive reader in the ignition or the ignition?

    Maybe its just easier to buy a whole new system or just bypass it for once and for all and just leave the cental locking system.

    Any advice would be great as I could start eliminating any suspects and get too the true problem maker.

    Sorry for the long post and thanks in advance.

    Dean
    I think this is a problem with the ignition switch. They're known to suffer from bad/loose/burned contacts. Remove the trim and check condition of connections. And /or if/when it does it again have a fiddle with the switch and connections and see if it has any effect.
    Perhaps it's also possible that this is affecting the alarm system since it senses voltage changes.
    Chaser.
    ________
    Similar faults appear on similar vehicles and have often been discussed before, so if you havenít already, please try some search terms in the 'search' feature at the top right of the thread list.

    Responses are submitted for discussion and analysis and are not intended to be definitive. Although I do my best I cannot guarantee the accuracy of the information given.

  5. #5
    Apprentice jello's Avatar
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    Default Re: Immobiliser/alarm Bypass.

    Thanks Chaser

    I removed the trim and found the plug to the passive reader around the ignition switch was loose (the one with a 4 purple/lavender wires). Clipped that together and suddenly more things seem to happen(all the doors unlock when starting the car/ a light round the ignition.)etc.

    Now it has struck me that, Could this be the cause of the alarm going off when locked with the fob, instead of the Volumetric sensor?

    1.When locking with the fob it takes round 20 min before the alarm goes off. I have locked it with the key (single lock not double) and all seems to be fine. So i suspect its the Volumetric Sensor as single lock disables this. Is this a correct diagnosis

    many thanks again... hope this also sorts out the sensor?

    Dean



    2000 1.8 3dr Hippo, Epsom Green.
    2001 TD5 Discovery II, Oxford Blue.
    2006 TD5 Defender 110, Java Black.

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