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roche1800

Member Since: 07 Apr 2020
Location: derbyshire
Posts: 415

Key Fob and immobiliser issue!

Can anyone advise on this scenerio, I have a 2014 Defender which a bought a number of months ago. There is a list of jobs to do which I will be starting soon!

It started and drove with a damaged fob with the seller.

I have removed the battery and recharged it, refitted it and tried to de immobilise with the fob and new battery and it appears not connect to the vehicle.

Here is a photo with what I believe to be the correct set up to unlock - bottom 3 buttons and lock top 2 buttons.

Click image to enlarge

27th Aug 2025 10:37am

Johan_B

Member Since: 20 Sep 2024
Location: Gothenburg
Posts: 136

2007 Defender 110 Puma 2.4 CSW Tonga Green

There is a procedure to re-sync the fob with the vehicle after the battery has been renewed.

27th Aug 2025 7:55pm

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 2482

With the doors shut click the lock button 4 or 5 times in quick succession, then click the unlock button once. This should then unlock the vehicle and sync the fob.

27th Aug 2025 9:38pm

roche1800

Member Since: 07 Apr 2020
Location: derbyshire
Posts: 415

Thanks, I have tried this and didn’t work. Any ideas please

28th Aug 2025 2:08pm

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 2482

I’m assuming you have central door locking and it was working before.

Normally disconnecting the main starter battery does not cause an issue with loosing fob sync or needing the fob to be re registered with the 10AS. However if the fob is not working and won’t resync then the next job is to re register it to the 10AS or ALM unit. Speaking of which, what year is your defender as from circa 2012 the unit moved from the 10AS to the ALM CHxxxxx unit and the latter has a low starter battery brownout issue.

Do you have a Nanocom Diagnostic tool ?

30th Aug 2025 12:03pm

macfrank

Member Since: 05 Nov 2015
Location: somewhere in the north
Posts: 1125

2015 Defender 110 Puma 2.2 SW Keswick Green

I don‘t quite understand. That fob on the photo is not original. Also you should have received two sets of key and fob.
Also door locking and immobiliser are two different systems, integrated in the same housing/fob/ALM.

30th Aug 2025 1:48pm

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 2482

Hi macfrank I think the OP bought the vehicle used and was only provided with what he has shown.

And yes, well spotted, I did not really look but that’s not anything like the insides of a Lucas fob, and I’m pretty sure it’s not the insides of the Lear fob with the chrome strip that was used on the last defenders or as a replacement system for a faulty unit in the last couple of production years.

Roche1800, can you check what alarm unit you have, if genuine it will be fitted behind the drivers side front footwell speaker, removal of speaker provides access to it .

30th Aug 2025 7:07pm

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