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Old 02-03-2011   #1
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Immobiliser issue

Hi all!

Sometimes in the new car, the code light wont go off and the car just will not start. Then after a few minutes, all will be grand and it will start no problems. It seems to take fits of this....

The key has been "shaved" ie the keyring end has been broke off, smoothed and a hole drilled through the key for a keyring...! Is my key wonkey or is the problem a bit more sinister? My dads car suffers the same problem but only when the starter refuses to work (needs a new starter) it will start with the code light on (suspected faulty dash). Getting a key cut and coded is not a problem. Neither is getting the key, ecu and immobiliser changed but i would like to try and avoid that...

Any help is appreciated!
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Old 02-03-2011   #2
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Re: Immobiliser issue

Probably the easiest think to have a look at is the aerial wire especialy bacuse you have lots of spares
its the black wire shown here. The hoop sits around your ignition barrel. People have had bad aerials before.


The immobiliser bit in the key is a little black pill looking thing or a grey chip, its probably not physicaly damaged. If its your only one though I would get a copy of the chip done while you still can, maybe its about to fail.

You can see the chip version here nexto the battery. The black pill looking chip would be in the same spot.
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Old 02-03-2011   #3
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Re: Immobiliser issue

Thanks Adrian! I didnt think of that ring, i must change it when i get the chance and see how it goes from there, it worked well in the old car... Hopefully getting a key on sat so that will eliminate the dodgy key. Thanks again and ill keep you posted
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Old 04-03-2011   #4
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Re: Immobiliser issue

Now I was driving this car last night, no problems whatsoever. This morning I got into it to move it so I could have comfortable space to work on it and it refused to decode. I changed the aerial in situ but it hasnt made a difference I did notice the code box wasnt in its place, maybe they had this problem before... Does this mean I have to change everything? Ie locks, box and ecu?
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Old 04-03-2011   #5
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Re: Immobiliser issue

Easiest thing to do is change the ECU the immobiliser and the chips in the keys. That way it saves changing all the lock barrels or sending the ecu to a specialist.
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Old 04-03-2011   #6
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Re: Immobiliser issue

It was indeed the immobiliser itself, i swapped the unit and ecu, put up the old key to the ring and it works without any problems! Just need to work the chip into a new key and i hope all is solved then. Thank you for your help
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Old 04-03-2011   #7
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Re: Immobiliser issue

you have multiple ecu + imobilisers.. can't you figure out how to emulate the signal from the imobilizer?
i would think it would be just something like bridge-ing some connections
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Old 05-03-2011   #8
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Re: Immobiliser issue

Quote Originally Posted by aurick86 View Post
you have multiple ecu + imobilisers.. can't you figure out how to emulate the signal from the imobilizer?
i would think it would be just something like bridge-ing some connections
In your dreams!, no-one has driven these cars away without the correct key.

Tony.
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