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Darren

Member Since: 25 Mar 2023
Location: Arkansas
Posts: 2

1998 Defender 110 300 Tdi CSW Coniston Green

300 TDI 10as immobilizer removal

Hello, I am new to the Defender world as of yesterday. I picked up my new to me 1998 Defender 110 from the port after importing it to the US. Problem is it wont start now. The previous owner said he bought the truck without the security fob and never needed it. So somewhere from the UK to the US the truck might have rearmed itself and will not let me start it up. I have narrowed it down to the 10as or the ignition switch. Instead of wasting time with them I would rather just replace one and remove the other. I know this is a touchy subject because of theft. So if you can help shoot me a message or shoot me some ideas on what else I can try.

Thanks!

25th Mar 2023 9:13pm

diesel_jim

Member Since: 13 Oct 2008
Location: hiding
Posts: 6031

There is a factory supplied plug in unit to remove the spider unit which is what usually causes the problems.

It's mounted in the battery box. drill out some rivets and you can access it. Mine used to play up, I took it out and there were lots of dry solder joints on the plug. re-soldered it and it was faultless after that.

26th Mar 2023 8:27am

donmacn

Member Since: 07 Nov 2017
Location: Nth Scotland
Posts: 1829

A car I’m working on now has an immobiliser, and I’ve bought the factory bypass plug.

But if you’re “over there” and getting the plug will take a while, I know I also read something at the time I was researching this about which wires to bypass. It might give you a short term fix while waiting for the plug to arrive - which is not expensive, and makes the job a lot neater.

I’d PM if I’d kept that info, or where I found it, but once a realised a plug was easily available I’m afraid I didn’t make a note. Donald

1994 Defender 300Tdi 110 SW - owned since 2002 - 230k miles and going strong
(The 'rolling restoration' or tinkering thread: http://www.defender2.net/forum/topic58538.html )
2000 Range Rover P38 4.0L V8

in the past..
RR classic - fitted with 200Tdi
1984 RR classic - V8 with ZF auto box
1993 Discovery 300Tdi

not to mention the minis and the Type 2 VW camper...

26th Mar 2023 10:02am

Darren

Member Since: 25 Mar 2023
Location: Arkansas
Posts: 2

Do you have a link to the factory plug option?

26th Mar 2023 6:32pm

donmacn

Member Since: 07 Nov 2017
Location: Nth Scotland
Posts: 1829

Honestly, a Google for “300Tdi immobiliser bypass” will do the job. On this side of the pond it throws up lots of results. Donald

1994 Defender 300Tdi 110 SW - owned since 2002 - 230k miles and going strong
(The 'rolling restoration' or tinkering thread: http://www.defender2.net/forum/topic58538.html )
2000 Range Rover P38 4.0L V8

in the past..
RR classic - fitted with 200Tdi
1984 RR classic - V8 with ZF auto box
1993 Discovery 300Tdi

not to mention the minis and the Type 2 VW camper...

26th Mar 2023 7:40pm

PaulMc

Member Since: 17 Jan 2009
Location: Kent
Posts: 486

Darren wrote:
Do you have a link to the factory plug option?

AMR4956

Click image to enlarge

. Paul.
1989 Arles Blue 2.5TD 110 Hardtop
1999 Epsom Green Discovery II 4.0 V8i 'XS'

27th Mar 2023 4:49pm

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