Disabling Alarm and Immobilizer

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Ed Watson

New Member
Posts
5
Hi all,

I am trying to start a 1997 Discovery NAS with the V-8. The vehicle was owned by a Land Rover enthusiast who sadly, died a couple of years ago. His distraught widow left the car sitting in the drive for a year, at which point I volunteered to get it going and sell the truck, along with a tonne of parts. It's been a bigger job than I anticipated. The vehicle started twice and ran strong, at which point I thought I had it beat. Hah! The joke's on me. The trouble codes indicate it's alarm/immobilizer issue. I have changed the battery, changed the battery in the key fob, tried entering an EKA code without success, disconnected the battery and then reconnected it with the key in position two .. and a host of other things.
Among the guys parts is a Hawkeye diagnostic tool that I recently discovered. I have successfully connected it and tried to disable the alarm and immobilizer. But for some reason the Discovery's computer won't take the changes. It asks me if I want to save the changes, I say yes, but nothing is saved. Any ideas why?
Thanks
 
Ed Watson said:
Hi all,

I am trying to start a 1997 Discovery NAS with the V-8. The vehicle was owned by a Land Rover enthusiast who sadly, died a couple of years ago. His distraught widow left the car sitting in the drive for a year, at which point I volunteered to get it going and sell the truck, along with a tonne of parts. It's been a bigger job than I anticipated. The vehicle started twice and ran strong, at which point I thought I had it beat. Hah! The joke's on me. The trouble codes indicate it's alarm/immobilizer issue. I have changed the battery, changed the battery in the key fob, tried entering an EKA code without success, disconnected the battery and then reconnected it with the key in position two .. and a host of other things.
Among the guys parts is a Hawkeye diagnostic tool that I recently discovered. I have successfully connected it and tried to disable the alarm and immobilizer. But for some reason the Discovery's computer won't take the changes. It asks me if I want to save the changes, I say yes, but nothing is saved. Any ideas why?
Thanks
Click to expand...
That would simply indicate a dicky starter motor to me. Cover the basics first.
 
Hi -- the codes are P1622 "wrong security codes received by the ECM in sequence" and P1621 "Communications with the Security ECM has not happened..."
 
Ed Watson said:
Hi -- the codes are P1622 "wrong security codes received by the ECM in sequence" and P1621 "Communications with the Security ECM has not happened..."
Click to expand...
IMO you have to replace the alarm ECU with confirmed working same part number one cos everything points to that unit unless it's a wiring issue on that path
 
Ed Watson said:
Hi all,

I am trying to start a 1997 Discovery NAS with the V-8. The vehicle was owned by a Land Rover enthusiast who sadly, died a couple of years ago. His distraught widow left the car sitting in the drive for a year, at which point I volunteered to get it going and sell the truck, along with a tonne of parts. It's been a bigger job than I anticipated. The vehicle started twice and ran strong, at which point I thought I had it beat. Hah! The joke's on me. The trouble codes indicate it's alarm/immobilizer issue. I have changed the battery, changed the battery in the key fob, tried entering an EKA code without success, disconnected the battery and then reconnected it with the key in position two .. and a host of other things.
Among the guys parts is a Hawkeye diagnostic tool that I recently discovered. I have successfully connected it and tried to disable the alarm and immobilizer. But for some reason the Discovery's computer won't take the changes. It asks me if I want to save the changes, I say yes, but nothing is saved. Any ideas why?
Thanks
Click to expand...
The link below may be of interest to you although the are more available, as I expect you have the 4.0 or 4.6 engine fitted to your disco, and if so then I believe that the security system is coded specifically to the vehicle, which will add a additional issue if you wish to try a replacement.

With your Hawkeye kit, if its suitable for your vehicle then it may just require a firmware/software update to work fully, although there’s also other diagnostic tool to use if not.

www.landyzone.co.uk

P38 alarm/immobiliser removal

Hi all, I have a year 2000 P38 with the 4.6 Bosch engine. The battery died and she's totally immobilised herself! Got a few things to try today, including getting the EKA code from my local dealer. My question is, does anyone in the North Shields/Newcastle area have the equipment to remove...
www.landyzone.co.uk www.landyzone.co.uk
 
discool said:
With your Hawkeye kit, if its suitable for your vehicle then it may just require a firmware/software update to work fully,
Click to expand...
AAMOF Hawkeye works quite well with the '97 V8 D1 as it is, the gist is that no diagnostic tool would work as long as the vehicle is immobilised which is the case here so the only chance i see is to replace the alarm ECU, should be programmable with Hawkeye as long as the replacement unit was not removed from immobilised vehicle and the circuit is intact, did it myself for a friend albeit it was not a NAS spec which according to the WSM might be a bit different as it seems they dont even have the EKA code feature.
 
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