Problem with central locking

[GrahamCardiff]

Hi Folks
I have a Sunlight Cliff 2018 campervan Ducato PVC
I wanted to open the van today via central locking/electronic key fob but it won’t function. Changed the lithium battery for an identical one but still no go.
Q: Is the immobiliser armed without it being set by the central locking key?
Any advice gratefully received!
Thanks
Graham

 

[Ivory55]

Is the voltage low on the battery or a bad earth ?

 

[GrahamCardiff]

Battery is fine. Not sure about the Earth

 

[Grummyb]

Normally the imobiliser has nothing to do with the vehicle being locked or unlocked it works via the chip in the ignition key do you mean the alarm?

 

[GrahamCardiff]

Yes - sorry for confusion

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[Grummyb]

I think the alarm will set if lock the van using the key this might be a silly question but gave you started the van since the key fob packed up because the main reason a key fob stops working is a flat vehicle battery

 

[GrahamCardiff]

Yep it starts ok - battery is fully charged

 

[Grummyb]

Obviously a transponder or receiver issue im guessing it will need a diagnostic plug in

 

[Ivory55]

Yep it starts ok - battery is fully charged

Does the central locking work with the engine running ok ?

 

[DP+JAY]

Does the central locking work from the button on the dash? If yes, it sounds like a fob/transponder fault. If no, sounds like a fuse/ecu fault.
DP

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[Gaston aires]

Try the spare Key, it might be that.

 

[Landy Andy]

Have you tried using the remote when the van is parked somewhere different. Some areas are bad for certain signals.

 

[GrahamCardiff]

Thanks all - problem solved by removing Earth lead and letting the power drain for 5 minutes or so.