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Discussion Starter #1
Hi, I have a 2003 3.0L 406 Coupe. It is coming up with an immobiliser fault with the little key card light in the dash. Does anyone have a diagnostic tool who can help me find out what the error is and possibly resetting the fault. I have had my key tested and it is fine so it could be that I will have to have the car reprogrammed.

Any one in the Stockport / Manchester area who give me any assistance would be greatly appreciated.


Kind regards

Citywizard
 

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Your key is your issue in so much as its not being read by the car the remote locking and the immobiliser chip are 2 seperate parts have you repaired your key in any way.
 

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Discussion Starter #3
Key

Hi, no the key has not been repaired or replaced. Had it checked and was told it is in perfect working order.
Thanks.
 

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Ok just checking as you would not believe the amount of times thats the issue !!
Next check involves lifting the carpet drivers side and check the wires on the floor under it as they get wet and rot causing this very issue on the 406 they go to a plug that lives in a puddle :)
 

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Discussion Starter #5
Will check tomorrow but I would be surprised as the car / carpet is as dry as a bone. Also have a new Immobiliser ring arriving tomorrow so once that is fitted I am hoping will solve the problem. Fingers crossed.
thank you so much for your time and assistance and I will keep you informed.
Regards
Citywizard
 

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Discussion Starter #7
Carpet

Cheers. So do you have to replace the wiring or can you dry it out? If so, can you just replace that section or does all of it have to be replaced? Off hand how many wires are their and from where to where do they lead, i.e how do I know I have the correct wires.
I have also been told because my battery went flat it may be that I will have to have the Bsi reprogrammed.
 

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Discussion Starter #9
Apologies

My apologies, spoken to so many people can't remember what I have said and not.
I will fit the Immobiliser ring when it arrives and if that doesn't work I will have to all an auto locksmith. I have also ordered a PP2000 Lexia 3 diagnostic machine. Not sure if that will tell me what the problem is or if I can clear it or not.
What actually happened was, for about 3 weeks I got a msg on my display saying "electronic anti theft system is faulty". The car worked fine and then I was ill for over a week, the battery went flat and then when I tried to get a jump start I noticed the key card symbol on the dash. I had the key checked and it is fine and was told in the 406 forum it is normally the immobiliser ring at fault. So, just waiting for that to arrive and then see if it fixes the problem. Not sure once it is in if the fault codes will need resetting or if the car will just start.
Thanks again for your help. I am disabled so my car is a lifeline. I can't get to the Doctors or hospital appointments with out it or get any shopping for that matter. I wouldn't mind but last November I paid a fortune for 2 x new cats, rear exhaust, new tyres.
 

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Ok the fact you were having immobiliser problems BEFORE battery went flat i would be back to the wiring under the carpet costs nothing to look if there are issues there it will stop you being able to recode the key anyway so best to sort that first any dodgy bits will be obvious.
 

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Discussion Starter #11
Sounds good. What would you do? Replace the section in the affected wet area or replace the whole thing? Any particular wire to be used?
Do you know how many wires their are to replace?
 

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Discussion Starter #13
Best way to get carpet out

Which is the best way to get to it? Take the car seat out or peel the carpet back from the pedals?
I can see a wiring room running parallel to the sill but I am thinking it is not this one as it is a thick loom.
 

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Discussion Starter #15
So I won't have to take the seat out? I am surmising the wiring I am looking for will be on the flat section.

You didn't say what to do to fix, replace the wires?
 

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Discussion Starter #18
Update

Car needed its ecu reprogramming. This sorted out the problem.
Thank you one and all for all your help.
 

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Thats good be careful not to let battery go flat and if you disconnect it follow the 3 minute rule if you get immobiliser fault flashing up again it will be the under carpet wiring.
 
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