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Thread: Another immobiliser problem (I think)

  1. #11
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    Starting problem

    here's my thread re starting problem, i've deactivated the passive coil and all good.

    Check the earth for the BCU it's at connector header under carpet just above the left foot rest, drivers side.

    Also get your auto eleco to check volts at the starer motor solenoid supply from the fuse box or at the starter? (red wire connection at front of engine fuse box) this will rule out BCU not closing earth path to operate the starter relay.

    I'll try and get some diagrams posted later today

    Cheers Lemo

  2. #12
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    Thanks for this Lemo, had a good read through your previous thread. I just wish I could get into the thing myself but that's not going to happen for another 2 weeks or so.

    Your thread got me thinking about the strange behaviour when it was running, i.e. climate control/ventilation completely inoperative and windows not working. Likewise passenger door not unlocking. All of these seem to work at the moment when the ignition is turned on but it still won't start. Passive immobiliser is turned off by the way. So, from your troubles, it sounds as though it could be the BCU. I HATE modern auto electrics because I really don't fully understand things so can I ask one simple question: if it's a BCU problem, should it still be possible to bridge the starter motor to make it function?

    Very reluctant to have the sparkie testing everything and costing me a fortune to find out the problem is the BCU. I'm going to ask him to check the starter motor and solenoid and earthing and if these are OK then it's probably easiest to replace the BCU. I can get a fully reworked BCU from Turners in the UK programmed exactly the same as the current one for £190 exchange plus postage. I can buy one for around £40 from Fleabay in the UK for the exchange unit. Not bothered about current AUD/GBP exchange rate as I have a source of sterling so don't have to convert currency. This is likely to be a lot cheaper than trying to get the thing fixed here.

    Will keep story updated as things progress.

    Lawrence

  3. #13
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    Could be the BCU but really need to test things to rule that out? Could also be the internal fuse box with the IDM thats the problem?

    If you can't wait, I'd have the auto eleco test some earth as I've mentioned in previous post, check if powers getting to the starter motor solenoid supply wire?

    If you read in my post sierrafery notes how to test the fusebox/IDM - quote - (if the symptom occurs again turn on manually the courtesy lamp and if it comes on the interior fusebox is ruled out but if not there's your problem) I didn't get this far as I found that turning off the passive coil was my problem, so either fob or passive coil at fault?

    I did remove my internal fuse box and gave it a good spray/clean with contact cleaner as there was traces of corrosion etc. Maybe get that looked at as well? there's a few post on the forum noting corrosion and bad solider joint causing issues???

    Really hard finding intermittent problems!!!!

    Hope the back settles down!

    Cheers Lemo

  4. #14
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    Thanks for all the help everybody. Sparky has just sent me a message to say that the starter fuse had blown. No further info. Tomorrow's job is for him to find out why! I've passed on all the info from Lemo to him. Just have to wait and see what he comes up with.

  5. #15
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    He may never find out why. Fuses can fatigue & add to that it may have been a bit dodgy from new.

    Bon Chance.

  6. #16
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    Quote Originally Posted by 4bee View Post
    He may never find out why. Fuses can fatigue & add to that it may have been a bit dodgy from new.

    Bon Chance.
    Well, Disco is now back on the road and my sparky can find nothing obvious that could lead to the fuse (or more correctly, fusible link) blowing. Starter motor and solenoid are both OK which is good. I'll now make sure I have a spare 30A fusible link and a spare relay on board

    Also, I've been having physio for my back and it's all coming good so I should be able to get back to working on the car in a couple of weeks. However, while the sparky had the car I decided just to pay to get some work done as I'm not up to crawling around under the dash or under the car. See "What I did to my Disco" for info.

  7. #17
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    Well, that is a bit of a bummer because one would prefer to find something positive so you don't get caught out again.


    Let me tell you about a "Captain Mainwaring type wrinkle" that may help if & when that happens again.

    Shown to me by an RAA Service bloke when the Starter fuse on the D1 let go.


    He had me press the two ends together with a screwdriver or some such while he cranked the engine over. Voila, instant spot welder, which I reckon would have been ok for a while but it did enable me to get to an Auto Sparky to get another 30A fuse.

    I could have cranked it but he wanted me to see what happens for future ref.


    In my case I knew what caused it to blow, ie. me arsing about with something electrical is what.

    You just have to get your back right now, Bon chance with that too.



    All is well that ends well.

  8. #18
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    Quote Originally Posted by 4bee View Post
    Well, that is a bit of a bummer because one would prefer to find something positive so you don't get caught out again.


    Let me tell you about a "Captain Mainwaring type wrinkle" that may help if & when that happens again.

    Shown to me by an RAA Service bloke when the Starter fuse on the D1 let go.


    He had me press the two ends together with a screwdriver or some such while he cranked the engine over. Voila, instant spot welder, which I reckon would have been ok for a while but it did enable me to get to an Auto Sparky to get another 30A fuse.

    I could have cranked it but he wanted me to see what happens for future ref.


    In my case I knew what caused it to blow, ie. me arsing about with something electrical is what.

    You just have to get your back right now, Bon chance with that too.



    All is well that ends well.
    Thanks for that tip, I'll file it away under the "just in case" heading. In the meantime I'll make sure I've always got another 30A fuse

  9. #19
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    I would. From that day forward I never had to do that or replace a fuse. And now I don't own a D1 & it is not necessary on a 2A.

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