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Someone told me that there is a microchip in the key for my 2004 Defender which is read by a coil in the ignition keyhole/switch and that this disables the immobiliser. While I know this to be true of some cars, I am unsure it is true of my Defender. Am I being led up the garden path here or is there a chip?

On my Mercedes the chip was evident and removable from the key whereas the 2004 Defender key looks identical to my 1991 Defender key.

Chris

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Guest diesel_jim

It's in the transponder thing Chris (the jobbie with the 2 buttons).

I'm sure Porny can explain in better detail when he reads this, but the exciter coil arond the ignition barrel senses that you're in the viscinity of the drivers seat, and it un-immobilises the passive immobiliser.

according to my old td5 handbook, the passive immobiliser will immobilise the engine after about 5 minutes of the ignition being turned off and the keys (well, transponder) being out of radio signal reach of the exciter ring.

Soo... your engine will automaticall immobilse itself even if you've not pressed the alarm "arm" button.

try it... take the ignition key off of your bunch of keys, make sure the transponder is well away from the car and try starting it after 5 minutes or so.

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What Jim said. There is nothing in the key, its just a standard blank key. The alarm system in pre 07 Defenders is basically the same Lucas 10AS unit found in the Discovery, which needs the 2 button plip to deactivate it. The only way you will deactivate it with the key is via the EKA code in the door :)

Later vehicles (Disco 2, Disco 3, Freelander 2) have the remote in the key itself but it has buttons and stuff. The only vehicle I am aware of in the range which DOES have a passive thingy in the key itself (with no battery) is the Td4 Freelander, but thats because its a BMW engine and part of that is a BMW immobiliser and I guess that is how they work. Diesel P38 Range Rover might be the same, not sure. And I haven't seen an 07 Defender yet.

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There must be a way of setting the setting the auto arming of the immobiliser !! either on or off !!! (Best read a owners manual sometime :ph34r: )

Both my last TD5 and the 07, can have the keys left in the ignition, and will restart after 10 mins or 10 hours !!

But used a 06 TD5 90 today, and that one rearms itself with the key left in, necessitating using the fob unlock, to deactivate the immobiliser, Only the 2nd one (from memory) that rearms itself

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Guest diesel_jim
There must be a way of setting the setting the auto arming of the immobiliser !! either on or off !!! (Best read a owners manual sometime :ph34r: )

Both my last TD5 and the 07, can have the keys left in the ignition, and will restart after 10 mins or 10 hours !!

But used a 06 TD5 90 today, and that one rearms itself with the key left in, necessitating using the fob unlock, to deactivate the immobiliser, Only the 2nd one (from memory) that rearms itself

Thats because tfhe keys are in the ignition... and thus more than likely so is the transponder fob thingy.... if the ring on the ignition switch senses that the fob is present, then it doesn't immobilise the engine.

not sure why the 06 one arms itself though... best ask a grown up. :D

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Thats because tfhe keys are in the ignition... and thus more than likely so is the transponder fob thingy.... if the ring on the ignition switch senses that the fob is present, then it doesn't immobilise the engine.

not sure why the 06 one arms itself though... best ask a grown up. :D

Jim,, If i take the key out of the 07 (with fob attached),, or the previous TD5 for that matter, and left unlocked, they would not rearm themselves !!

Gawd know why this 06 one does, same as a one previous, a 04 year if i remember !!

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Hi Tim

you are right, it's a setting. Immobilser - passive or active arming. Active will arm itself after a time period whether key is in ignition or not. When you put the key in and turn dash LED will ignite and horn will sound a couple of beeps after a few seconds as a reminder. Defender won't start until fob unlock is pressed.

Set it to Passive and all this stops and alarm/immobiliser on activates on fob locking.

Chris - as for the fob or the key having a transponder in, that's complete bolloxs :D

Cheers

Steve

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I agree with Steve. I don't think there's any proximity sensors involved.

Either the immobiliser comes on automatically after a period of time and needs to be disarmed with the remote; or it comes on only when the remote triggers it.

RFID tags and transponders are well beyond this Lucas system (I think I used to have the same systme on my old Metro!).

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Well, I do not have to blip any buttons to make it run, just turn the key.

Sandbag has a Rover car with the same blipper and her car immobilises after you open and close the door, needing the unlock button pressed before it will restart.

Chris

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Well, I do not have to blip any buttons to make it run, just turn the key.

It's set to passive activation in that case :) The active is a pain in the neck when off roading. I must get round to changing mine to passive too.

Cheers

Steve

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I thought they were all passively deactivated if the plip was present...

Never seen one that wasn't anyway, and I have driven a hell of a lot of 10AS alarm equipped vehicles in the last eleven years at work...

That's because mine was a base without alarm and immobiliser ;) Paid local Indepedent LR garage ten pounds to activate both and sync two new fobs for me, instead of the 250 pound option. They must have set it to active.

Cheers

Steve

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I thought they were all passively deactivated if the plip was present...

Never seen one that wasn't anyway, and I have driven a hell of a lot of 10AS alarm equipped vehicles in the last eleven years at work...

Mmmm.. now had 2 different Defenders in 2 days that active lock !! ie the immobiliser self arms with or without the key/plib(fob) in the ignition !! :o:huh:

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It should arm after the 5 min delay whatever, even with the plip on the keyring. It only disarms when you turn the key to position 2, then you see the red light come on for about half a second and then go off and stay off, thats the way all the ones I have seen work anyway.

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It should arm after the 5 min delay whatever, even with the plip on the keyring. It only disarms when you turn the key to position 2, then you see the red light come on for about half a second and then go off and stay off, thats the way all the ones I have seen work anyway.

Not these 2 Stephen,, !!! Both need the unlock button on the plib pressing, before the vehicle will start !!!

Previous one's, including current 07 does as you describe

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There must be a way of setting the setting the auto arming of the immobiliser !! either on or off !!! (Best read a owners manual sometime :ph34r: )

Both my last TD5 and the 07, can have the keys left in the ignition, and will restart after 10 mins or 10 hours !!

But used a 06 TD5 90 today, and that one rearms itself with the key left in, necessitating using the fob unlock, to deactivate the immobiliser, Only the 2nd one (from memory) that rearms itself

Hi i know if you go to a garage with a T4 or simular computer you can alter alarm/immobilizer functions or dissable altogether B)

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I take it all back! I was entirely wrong.

Engine immobilisation occurrs either when you arm the alarm OR 30s after you turn the engine off and open the driver's door OR five minutes after you turn the engine off.

It remobilises if you dissarm the alarm OR if you turn the key to position II with the fob in proximity to the starter switch!

For clarification: it absolutely does require the fob to be near the switch and senses it's location.

To dissarm the immobiliser, you have to follow the override procedure:


Turn key to position II

Hold for 5s

Switch off

Open and close driver's door

Turn to Position II and back to 0 as many times as stated in the first digit of your security code

Open and close driver's door

[That's digit one of the code]

Repeat as above for digits 2, 3 and 4

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I take it all back! I was entirely wrong.

I don't. Your user manual may say that, but that's not how it works. The once activated the Immobiliser can only be turned off by pressing the unlock button on the fob or by entering the secuirty code with the key. It does not work as described in the manual.

Cheers

Steve

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Ok,, 2 days ago, a 06 year 90 "Silver Le" would rearm itself if left with the key in or taken out, only way of starting was by pressing the plib unlock

Yesterday had a play, ??? but certainly did not enter any lock codes as above

Now, the vehicle was left at 0800 this morning with the key/plib in the ign, just been to it now, and starts ok, without touching the unlock button,

Now going to take the key out and leave unlocked, will see what happens :huh:

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