Alright here we go this may be out there already but from what I have read/found no one has a straight answer. Please read completely before you start and disconnect your batter if you want to I didn't and it still worked.

These are the steps that I took to remove the immobilizer on my 98 disco after reading the wiring diagrams found on this site . ( This only works if you have the non spider immobilizer.) late 96-99 models. If this does not work then you probably have some thing else wrong and the immobilizer is not your issue according to the wiring diagrams I have read. This worked for me and may or may not for you.

1. Look for the green box under the glove box at passenger foot well. It is between the ECM and passenger kick plate that is your security box. If you do not know what it looks like there are many pics of it on this site but for those who don't want to check it is green rectangle with a slopped top on onside.

2. There are two plugs on this box a big one and a small one. The big plug is black and that is for your inputs for the windows locks etc. The small plug is your out puts and the one you will be dealing with (small one) it should be green or white depending on where you are and from the pics I have seen.

3. On the small plug there are two wires that are black with red/orange stripe.( Solid black and red/orange stripe.) Cut these two wires on the loom side only and twist them together. Leave enough wire in case you have to put them back together again. ( This is an immobilizer fix and not an alarm fix.)

4. If you have done this right put your key in and your disco should crank up.

5. If you have the bonging alert noise inside the cab and you ring around the key switch is red the plug for that is above the key switch to get access to the plug you need to remove the plastic form the steering column you will see it as soon as you remove the plastic.( small white one)

I did this last night and my 98 disco that would not crank with out having the key in the on position and taking a screw driver and going across the starter coil will now crank and run by using the key only.

This is a temp. fix to get you going if the immobilizer decides to shut you down for no reason. I'm going to leave mine this way but you can do as you wish.

I do not have a key fob so I can not tell you if the remote door unlock still works. They should still work because all you have done is taken the immobilizer out of the loop.

I also have an spider by pass plug for those TDi's and 95 and back models if any one needs one

I will post pics later if needed.

95 Disco 175,000 miles
98 Disco 150,000 miles
97 Disco 171,000 miles

I would still rather have a Land Rover and B.L problems than own a Ford .

 

yes...pics please

 

 

 

 

Well here are the pics of what I did

 

thanks, they'll come in handy !!

 

Any time like I said this worked for me and I know how a big pain in the a$$ it can be when all is well and it goes south with your disco. This is my try any thing wiring disco just for trails so I don't mind. If you guys want me to try some thing else just reply and I will give it a go. I have two other disco's one for road all original and the other for on and off rd.

I'm also an Engineer so I sorry if I get to tech.

 

I realize this is an older thread, but thanks for the info! I just got a '96 disco, and think I may be having that problem with mine. I don't drive it much, but the other day, when I drove it to town and turned it off, it wouldn't start until about 30 minutes after I tried (and tried and tried...) to restart it. It wouldn't do anything when I turned the key. I don't have a fob, just keys. I was suspected something with the alarm system. Now I'll have this fix in mind when it happens again. I may wire in a switch to have ready to try, so I don't have to leave it by-passed.
So, would the actual problem be the immobilizer (?) malfunctioning, or something else sending a wrong signal to it?

 

The prob. is the security signal that is sent form the green box that turns on the immobilizer. By taking that part out of the loop it can no longer send the signal. The electronics on these suv/trucks are not the greatest and some times for no reason the system will lock down the rover. This is the way I have over come my issue with the lock out.