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Craig772

Member Since: 23 May 2022
Location: Cannock, Staffordshire
Posts: 73

TD5 Year 2000, X Plate. Immobiliser won't disarm.

Hi folks,

I've read around some of the other threads regarding immobilser issues but nothing seems to relate to my issue so I am hoping for some advice.

I've had the Defender 90 TD5 for a week, purchased from a reputable used LR reseller 3 hours drive away (I don't want to take it back - yet). She's a 2000 CSW from factory with the Lucas 17TN Key, SRD - MPT 1340 - GB two button fob. No central locking, no electric windows.

Last night the vehicle failed to disarm, I opened the drivers door, the alarm was activated, I

about with the key in the ignition and pressed the fob, eventually it disarmed. I drove off and didn't re-arm it until I got home. This morning it's not disarming again.

If I press the arm button I get the 3 flashes from the indicators. When I press the disarm button I get nothing.

If I can't get it fathomed out I am thinking of getting a local vehicle alarm specialist to fit an aftermarket alarm and disable the factory fitted unit.

Any ideas?

TIA.

8th Jun 2022 9:29am

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6484

2015 Defender 90 Puma 2.2 XS CSW Montalcino Red

Do you have two fobs or just one? It could be a faulty 'disarm' button/switch on the fob, as it arms OK - so the transmitter works.

Assuming the 10AS settings haven't been played with from the factory you shouldn't need to actively 'arm' and 'disarm' the immobiliser.

If you get it into the 'disarmed' state, then unlock with the key, turn the key in the ignition and the immobiliser should disarm (the 10AS does this using the 'exciter' coil around the column lock to make the fob transmit).

When you turn the ignition off after driving, the immobiliser rearms itself after about a minute (time plucked off the top of my head!).

I've got this setup on my Td5 converted 90 without central locking. I don't use the fob buttons generally, but if I do 'arm' with the fob button it won't disarm using the key-in-ignition method. It needs to be disarmed using the fob before it will start.

1988 90 Td5 NAS soft top

2015 D90 XS SW

8th Jun 2022 10:23am

Craig772

Member Since: 23 May 2022
Location: Cannock, Staffordshire
Posts: 73

Hi Martin,

I have just the one fob. That's really useful information regarding how it works, so in summary if I do nothing with the fob the vehicle will arm/disarm the immobiliser by inserting/removing the ignition key. By using the fob the immobilisr and alarm is armed and both can then only be disarmed by again using the fob.

I had considered that the 'system' may be fine if it's arming. Based on your suggestion I've now taken the fob apart and clicked the disarm button a few times which has been received by the vehicle. I think I'll get another fob sorted.

Thanks for the advice.

8th Jun 2022 10:49am

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6484

You may just need a new case, it could be the button rubber is worn and not pressing the switch properly.

Info about replacement cases:

https://www.defender2.net/forum/topic83740.html

But in any case it would be worth getting a spare fob programmed as you only have the one.

1988 90 Td5 NAS soft top

2015 D90 XS SW

8th Jun 2022 10:52am

Craig772

Member Since: 23 May 2022
Location: Cannock, Staffordshire
Posts: 73

Yeah, I've just looked at the underneath of the rubber button covers. They look shiney and they're sticky when poked with a blunt pencil. I guess that something has got inside the fob but the circuit board looks fine.

8th Jun 2022 11:01am

jrule

Member Since: 10 Aug 2015
Location: Hertfordshire
Posts: 302

May sound obvious but change the batteries in the fob? There is a guy that repairs the AS units and can supply new fobs. Try looking up
https://www.technozen-electronics.co.uk/la...-services/

8th Jun 2022 11:15am

Craig772

Member Since: 23 May 2022
Location: Cannock, Staffordshire
Posts: 73

Thanks jrule. I've just emailed him to see about providing a second fob.

8th Jun 2022 11:26am

Goldenballs

Member Since: 22 Apr 2021
Location: Reading
Posts: 55

I had an issue with my fobs that the terminals for the battery inside had become loose. Re-soldering did the job.

8th Jun 2022 11:36am

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 1782

Craig772 wrote:
Thanks jrule. I've just emailed him to see about providing a second fob.

Worth checking out remotekey as well, they also do an integrated fob, noting you will need the fob programming to your alarm ECU and they include that in their costs.

https://remotekey.co.uk/land-rover-keys-re...mobiliser/

8th Jun 2022 12:28pm

Craig772

Member Since: 23 May 2022
Location: Cannock, Staffordshire
Posts: 73

Hi IanH,

That's looks like a great solution

8th Jun 2022 2:10pm

Paulo RB

Member Since: 16 Mar 2021
Location: Wirral Island
Posts: 11

2000 Defender 110 Td5 Heritage LE Bronze Green

I had the same when got my 2000 td5, great advice on here was new battery in fob, worked a treat. Paul RB

12th Jun 2022 6:43pm

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