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Old 1 Week Ago   #16
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Re: Immobiliser problem

Fuseman hi, have you got a result with your fault yet?

Thanks Brian
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Old 1 Week Ago   #17
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Re: Immobiliser problem

Quote Originally Posted by Communicator View Post
I assume that the 7,5A fuse that you are removing and replacing is F18, which normally provides a permanent (24/7) supply to the Code Control Unit.


Unfortunately there are no relays that could latch closed, so the most likely causes of failure are thermal with a micro crack in one of the components, or a firmware problem causing a lockup in the software.

I am sure that any simpler explanation would be most welcome.

The external wiring of the CCU, is relatively simple. It consists of a dedicated positive supply from fuse F18, with an earth connection at or close to the ECU. There is a short 2 core screened cable to the aerial on the ignition switch. Outputs are to the code lamp, and to the ECU. Finally there is a connection to the diagnostic socket.

The output or communication to the ECU is routed via connector D004 pin C19, and the earth connection is via D004 pin A2.


I believe that connector D004 is the multiway connector, under the engine bay fuseboard. I have read of corrosion occuring in this area, and the possibility could be worth eliminating.

To access D004, first disconnect the battery negative post. The fuseboard can then be unlatched, and carefully moved aside.

Fuseman & Brian,

I have been browsing and thinking. May I suggest that it could be of interest to browse the following thread. The thread title mentions x250 engine earthing straps, and ours are x244, so the earthing strap part does not apply. I suggest that you start reading from the posts dated 2 December 2013, towards the end of the first page, paying particular attention to the second page.

https://forums.outandaboutlive.co.uk...-again-/33081/

If I have understood correctly, the Code Receiver is failing to recognise your keys. It is worth noting that the code warning light is not powered by the same fuse as the code receiver, which only removes the negative from the warning light when the key is recognised. Could it be the case that the code receiver is loosing its positive supply due to a faulty wire or connection, as described in the linked thread?


One possible course of action would be to install an LED indicator to semi-permanently monitor the presence of 12V +ve at the code receiver, connector A pin 3. I have two colour codes for this wire, grey/blue, and red/yellow. I suspect that the latter code is correct, as the former colours are also shown for pin 2, the warning light connection.

Perhaps a miniature switch could be included in the circuit, so that the LED could be turned off, if it became a nuisance. I am thinking of something quite Heath Robinson, perhaps secured to the steering column with cable ties.
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Old 1 Week Ago   #18
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Re: Immobiliser problem

Thanks Communicator for your help with this info, I am on that forum and Euroserve has always been helpful, he used to run a fleet of white vans, now retired, doesn't post much now?

Is it the same fuse box on the x250 just in a different place?

I did look at the multi plug in the bottom of the fuse box it was clean and dry used contact cleaner on it anyway, could still be broken wire though?

Is the light on the dash is powered from the fuse box or the immobiliser control box? With the immolbiliser control box unplugged the dash light DOSENT come on when ignition on, obviously it won't start

Is there a relay in there that powers up the Ecu?
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Old 1 Week Ago   #19
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Re: Immobiliser problem

No I think your key ecu shot . Normally we change key ecu and engine ecu now if some cowboy or hackers been on your chassis number and changed it with a clone your screwed

New engine and key ecu prove me wrong
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Old 1 Week Ago   #20
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Re: Immobiliser problem

I think that the engine bay fuseboxes on the x244 and x250 are similar.

The key code light on the dash is supplied with a positive via the ignition switch and F37 in the LHS cab fuse box. The negative (earth) to the LED is controlled by the code receiver, so the LED will not illuminate if the code receiver is unplugged. However I am wondering what happens if fuse F18 in the engine bay (code receiver supply) is removed, and then the ignition is switched on. If the LED does illuminate under these conditions, it is indicating a loss of supply to the code receiver which will obviously be unable to recognise the key. The loss of supply could be due to a wiring fault - broken wire, bad connection, or even a faulty fuse.


As I have stated previously, there is no relay to activate the ECU. The code receiver sends a key recognised signal to the ECU, which then operates the main injection relay, T09.
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Old 1 Week Ago   #21
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Re: Immobiliser problem

Thanks again loads of help with bits of knowledge gradually putting a picture together

NEED some dry weather now to get out under the bonnet
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Old 4 Days Ago   #22
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Re: Immobiliser problem

I have a x244 2006.

I only read about the immobilzer.
Can be a problem if the battery goes flat.

Then there is an emergency restart feature ?
The key is paired to the immobilizer. Needs to be programmed at a dealer.

Your battery in your key isn't flat?
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Old 4 Days Ago   #23
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Re: Immobiliser problem

Key can go out of sync with code unit. If your code unit is OK several places can read it and code new transponders to start it. https://www.autotronics.co.uk/produc...ar-key-service
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Old 2 Hours Ago   #24
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Re: Immobiliser problem

Hi guys thanks for your on going support,

Communicator, lh or rh cab fuse box does not have a f37, there is f36 which is fine?

My dash led padlock symbol does stay on with ign on and f18 pulled, which confuses me as you say this indicates a loss of supply to CCU? F18 is the supply red and yellow

Read the thread you suggested and given the harness a good tug about and haven't been able to make it fail today!! Switched ign on and off twenty times! Bloody irritating thing!

Cheers Brian
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Old 2 Hours Ago   #25
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Re: Immobiliser problem

Corcai, ive sent email to place you suggested tried to explain situation?

Don't know if they do a drive in service?

Thanks for your help
Brian
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