1996 Defender immobiliser

1996 Defender immobiliser

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100SRV

Original Poster:

2,125 posts

241 months

Thursday 21st May 2015
quotequote all
Hello,
I have a 1996 Defender 300TDi which has an immobiliser operated by a 3TXA fob and would like some help on how it works. The fob (very worn) has two buttons, one plain (1) the other appears to have a padlock symbol (2).

The dash LED usually flashes until engine start, I think I've seen the "immobiliser" warning lamp (key symbol) illuminate briefly.

Yesterday I set the alarm off, don't know how but I disarmed it by pressing one of the fob buttons (can't remember which), now the dash LED is lit permanently. I spent a while trying to find instructions - none in the owner's manual and very little help on the www either.

Does the padlock button arm it and the plain one disarm it (perhaps to use a spare key without fob)?

I read that the fob has a proximity coil so the immobiliser is disarmed if the fob is present...if so would I be correct to think it has three modes?
Off - with spare key
Auto - key with the fob disarms it, immobilser sets when fob removed
Manual

I'm a bit reluctant to randomly press buttons because it is LOUD when it goes off...

100SRV

anonymous-user

53 months

Friday 22nd May 2015
quotequote all
Has it got a factory fit radio?
It was a while ago now so I might be a bit off, but in my 300TDi Discovery there was a known issue within the radio loom.
LR even produced a sub-loom to add between the main car loom and the head unit to circumvent the issue.

100SRV

Original Poster:

2,125 posts

241 months

Friday 22nd May 2015
quotequote all
Crossflow Kid said:
Has it got a factory fit radio?
It was a while ago now so I might be a bit off, but in my 300TDi Discovery there was a known issue within the radio loom.
LR even produced a sub-loom to add between the main car loom and the head unit to circumvent the issue.
Interesting...it had a radio cassette which I've since replaced. When I removed the panel which holds the cigarette lighter / RWW switch (to swap to RWW was closer) I noticed that it appeared to have a second set of car radio DIN connectors tucked in that space. I'll investigate further.

Any suggestions on how the key fob is used or on operating modes?

anonymous-user

53 months

Friday 22nd May 2015
quotequote all
Fraid not.
It's just mention of the key symbol appearing on the dash rang a very feint bell....
With my Defender I just don't bother with the fob at all as it seems so very random, and just rely on the sensor part of it which seems to work. The one time I tried to start it with just the key it was having none of it. Not a peep.
IIRC though, it's the padlock button to lock and arm the car, and the blank button to silence and then unlock it. I think the LED remains illuminated if the alarm has been triggered.

Edited by anonymous-user on Friday 22 May 15:37

100SRV

Original Poster:

2,125 posts

241 months

Tuesday 26th May 2015
quotequote all
Crossflow Kid said:
Fraid not.
It's just mention of the key symbol appearing on the dash rang a very feint bell....
With my Defender I just don't bother with the fob at all as it seems so very random, and just rely on the sensor part of it which seems to work. The one time I tried to start it with just the key it was having none of it. Not a peep.
IIRC though, it's the padlock button to lock and arm the car, and the blank button to silence and then unlock it. I think the LED remains illuminated if the alarm has been triggered.

Edited by Crossflow Kid on Friday 22 May 15:37
Thank you!

Oddly enough I had cause to test this in a practical fashion after refuelling at Morrison's in Haverford West this weekend. I returned to the car, key in ignition turn to crank and
TOOT TOOT TOOT TOOT TOOT TOOT TOOT TOOT TOOT TOOT TOOT TOOT
Key off, frantically press a button
repeat
TOOT TOOT TOOT TOOT TOOT TOOT TOOT TOOT TOOT TOOT TOOT TOOT
attempt 3
press correct (plain) button and all was well. Made me very wary when starting the engine after that little performance.

The petrol station was deserted as it was late on Sunday - the attendant was having a good look from the shop window.