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LJMARSDEN



Member Since: 08 Jun 2021
Location: Nottingham
Posts: 325
United Kingdom 2006 Defender 90 Other HT Java Black
Central locking fault
The key fob is not unlocking/ locking or even causing the hazards to flash

Nor is the central locking working from within the vehicle.

This came about after the battery being flat but to my knowledge it is possible to repeatedly press the lock/ unlock key and the fob should reassign itself? Does not appear to be working.

I have checked fuses and they’re still supplying voltage now the battery is replaced.

Any suggestions please. 4.0 V8 Defender 90

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Post #1044946 5th Sep 2024 6:08pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20290
United Kingdom 
Is the battery in the fob a new one? ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️
Post #1044948 5th Sep 2024 6:11pm
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LJMARSDEN



Member Since: 08 Jun 2021
Location: Nottingham
Posts: 325
United Kingdom 2006 Defender 90 Other HT Java Black
It is a brand new battery, yes. Quite frustrating... 4.0 V8 Defender 90

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Post #1044949 5th Sep 2024 6:11pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20290
United Kingdom 
You can sync it to the AS10 by pressing it rapidly as you suggested.

If that’s not working, which seems to be the case are the battery clamps tight and the grounds the transmission tight?
It might show voltage still when you check it, but if there is high resistance any sort of load could cause significant voltage drop causing the issues you describe.

Is the battery showing a sensible voltage at rest so should be 12v minimum.

Might be some ideas there, my guess it’s the vehicle not the fob…

Might be worth checking for any water too, as we have had a lot of rain, and that may if you’ve been out in it be the issues eclectically underneath with the transmission.

Be sure that there is appropriate voltage on each fuse shoulder too and that the fuse isn’t loose, thiugh this isn’t that likely you never know. ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️
Post #1044950 5th Sep 2024 6:19pm
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LJMARSDEN



Member Since: 08 Jun 2021
Location: Nottingham
Posts: 325
United Kingdom 2006 Defender 90 Other HT Java Black
Good suggestions, It wasn't long ago since the contacts for the earths were infact wire brushed fresh since the build but we know how quickly things can corrode again. I will have to check the voltages over the weekend while I drive the other car and report back. I am too leaning towards the AS10 or a voltage problem, as this issue was at first intermittent and so became a developing problem, potentially.

(When checking the fuse voltages is was sat at 12.5v and 14.2v while running, which I believe to be acceptable) 4.0 V8 Defender 90

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Post #1044951 5th Sep 2024 6:36pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20290
United Kingdom 
Yeah, that is acceptable voltage ranges.

It has been known for water to get in or around the AS10 / its contacts plug etc.

You could add a temporary earth and see any difference if any, and there is also the rear loom grounds as well as the main one.

Good luck. Thumbs Up ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️
Post #1044968 5th Sep 2024 9:33pm
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LJMARSDEN



Member Since: 08 Jun 2021
Location: Nottingham
Posts: 325
United Kingdom 2006 Defender 90 Other HT Java Black
Thanks for all this, I'm seriously not looking forward to tackling this one Big Cry Rolling with laughter 4.0 V8 Defender 90

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Post #1044983 6th Sep 2024 7:06am
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bob neville



Member Since: 30 Apr 2009
Location: Marbella
Posts: 3248
Spain 2001 Defender 90 Td5 SW Epsom Green
Don’t know if this will help, this is how you sync the key fob on a TD5.

With vehicle unlocked, take battery out of fob and then hold both buttons down for 10 seconds to drain residual power.
Battery back in then press lock four times and unlock once. That will sync the fob back to the ECU. 2015 Jaguar XE240 R Sport - goes like ....... !!
2013 Defender 90 CSW - sold
2009 Defender 110 Double Cab - sold
2001 TD5 90 CSW - offroad project - sold to a forum member
2011 Porsche Boxster - for the sunny days !
Post #1044996 6th Sep 2024 8:42am
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LJMARSDEN



Member Since: 08 Jun 2021
Location: Nottingham
Posts: 325
United Kingdom 2006 Defender 90 Other HT Java Black
I'll give this a go too, thank you very much 4.0 V8 Defender 90

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Post #1044997 6th Sep 2024 8:44am
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LJMARSDEN



Member Since: 08 Jun 2021
Location: Nottingham
Posts: 325
United Kingdom 2006 Defender 90 Other HT Java Black
Turns out the immobilization fuse has 12v going to it. i removed both of the engine kill fuses in the underseat fuse panel and inserted them again and there we have it. working.

Very weird, concerning and suspicious.... 4.0 V8 Defender 90

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Post #1045031 6th Sep 2024 2:22pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20290
United Kingdom 
It could be the contacts the fuse is seated into is loose, a little bit of corrosion or moisture.

Defenders get very high vibration levels and things can get loose by themselves, and then that causes voltage drop over the two fuse contacts by high resistance due to poor contact. But then that can vary by things such as atmospherics, wet conditions, cold weather, warmer weather and things like that sort of thing.

Glad it’s working for you, if the issue comes back I’d take a look at the fuse holder contacts, just the check they are clean and tight. ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️
Post #1045034 6th Sep 2024 4:01pm
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