Immobiliser and Orange Padlock Symbol FIAT Ducato 2.8 Hymer B644 2004. (1 Viewer)

Mademe2

Free Member
Feb 22, 2023
3
0
Cheltenham, UK
Funster No
94,176
MH
Hymer
Am having massive problems with this!

It’s not new I know, but we have just spent 3 weeks coming back from France because the orange padlock light would not go off.

Sometimes it went off and then it will not. It’s been on 5 different diagnostic PCs in 4 different garages in France with no fault found. Three weeks ago it packed up and is now ( we hope being shipped home ). We are on the train.

Have done all the usual things, earths, battery connections, cleaned connections to ecu’s for both engin and key. Each garage did the same with no result apart from it will not start.

The main FIAT dealer in France said they checked to loom and again no flat found. Keys are fine, codes checked and again no fault found.

Apart from this it runs great and is very well looked after.

What is my next step? Any experience with this issue would be more than welcome.

Looking forward to anything you all have.

Cheers

M
 

PeterCarole29

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Jul 23, 2013
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Hi i cant help with advice other than to say it may help if you give the year and engine size
also suggest does anyone know of a specialist who might fix it here
 
Jul 13, 2008
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Welcome to the fun, this has happened numerous times to my 2004 Ducato, most of the time I would just remove the key from the ignition and reinsert turning the ignition on but not trying to start the engine, if the padlock didn't go off just remove and try again.
 

Emmit

LIFE MEMBER
Aug 14, 2009
8,073
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Jan.2014
This is a long shot.
I appreciate you are/were on holiday but is it possible that in the motorhome, on holiday, did you have your everyday vehicle keys with you?

I have had occasions when I had the car keys with me and the van refused to start. It was a Fiat X244 like yours and, just for the record, the car was an Audi with a transponder in the key.

It would only start when I left the van, put the car keys a distance away, returned to the van that started straight away.

I have posted this before. It still baffles me now.

I hope your problem has so simple a result.
 
Mar 11, 2013
1,286
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Gillingham
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coachbuilt
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since 2005
I had this happen on mine and I found the answer in the handbook. I can't remember what it was now but I'll have a look tomorrow
 
Mar 11, 2013
1,286
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since 2005
I know it couldn't be immobiliser because mine is an after sales addition. I have a feeling it was caused by low battery voltage where mine had been standing unused.
 
Oct 10, 2018
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Bracklesham Bay, West Sussex
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If your Fiat Ducato is fitted with the Iveco based engine it could be worth talking to www.vantuner.co.uk who deal with a similar immobiliser problem on Iveco Daily vans and may have an answer or be able to help . (If you scroll down in their services section the information about this is written there)
 
Apr 6, 2019
3,806
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Eye, Peterborough, UK
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RV
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FourWinds Windsport 6.8L V10
1999 Ducato based MH - I ended up bypassing the immobiliser altogether as the old Fiat fitted ones eventually go senile and forget themselves.

You probably have the same system? Three wires go into the top/side of the fuel pump near front of the engine. It is not a 5 minute job before someone says I am giving thieves information. If the little circuit board inside that housing does not get a good signal from the key aerial around the ignition barrel and the yellow immobiliser controller hidden in the dash in front of the drivers right knee then the engine will turn but not FIRE as there is no diesel being delivered.

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Mar 11, 2013
1,286
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Gillingham
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coachbuilt
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since 2005
Had a look in the hand book and eventually found the symbol. As I thought immobiliser warning but since at time of manufactur mine didn't have one I ignored and after a short time disappeared and has not returned.
 

TheBig1

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Nov 27, 2011
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It is most likely the receiver that sits by the lock barrel is not picking up the key. Either faulty, they crack or has moved. IF you can find a replacement it is fiddly to fit, but any auto electrician will bypass the immobiliser permanently to prevent it happening again
 
Oct 14, 2007
4,028
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Rochester
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Auto-Trail Mohawk
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16 fun filled years
Immobiliser problem? Take it to the local traveler site they will sort it out for you in a couple of mins.
 
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Mademe2

Mademe2

Free Member
Feb 22, 2023
3
0
Cheltenham, UK
Funster No
94,176
MH
Hymer
Dear All,
Thanks for your help with this. I was informed that no fault could be found with either ÉCU and the harness was buzzed through.
It has to be solved so not sure what to do next?
I will ask the garage about the ‘by pass’ of the immobiliser, but am not sure how / if the engin ÉCU will allow this to happen? I think the engine type changed around 2004 in the 2.8 Ducato so I need to establish which mine is? Any help on the bypass would be great.
If not I guess I need to start replacing key ÉCU re programming to keys and all that expensive Carry On in the hope something addresses the issue??? Bypass sounds way better.
So any more info would be well received.
Thank you again for your help with this

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Apr 6, 2019
3,806
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Eye, Peterborough, UK
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59,702
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RV
Exp
FourWinds Windsport 6.8L V10
Motor electrician. Delete immobiliser. Either electronically or physically switch out the fuel pump for the none immobiliser fuel pump.
Done.
 
Feb 22, 2011
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Newcastle under Lyme
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I don't think the engines changed much in 2004, I believe it was more like 2007 when the x250 was introduced along with the 2.3 engine.
Is the immobilizer the Fiat factory fitted unit or an aftermarket one. I have the 2.8 jtd on a 2003 with a Sigma alarm/ immobilizer fitted by supplying dealer Brownhills. This seems common to lots of vehicles of this age.
The sigma is deactivated by pressing a fob button.
It'd be useful to know which you have ?
 
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Mademe2

Mademe2

Free Member
Feb 22, 2023
3
0
Cheltenham, UK
Funster No
94,176
MH
Hymer
JEV88!!!

Now your talking! Do you have any more details and i will pass them on to my garage.

Thanks again
 

TheBig1

LIFE MEMBER
Nov 27, 2011
17,663
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Funster No
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many many years! since I was a kid
Deleting the immobiliser in that era van is simply a wiring job without need to recode a pump. There are details of this online, but best left to a professional auto electrician. It's not something I will share online with somebody I don't know. I hope you understand, as I am not being awkward or suggesting anything. You would be amazed who reads this forum.

All I will say is that it means running a fused supply from the correct place on the fusebox

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