I have a td5 2000 110.
I collected the car back from the garage as had a new clutch installed and other bits.

This morning the alarm kept going off. Its got an immobiliser and I have a defender key fob with 2 green buttons. I don't lock the car as when I push the drivers lock down to open it I need to get inside to pull up the lock again as the key dosnt turn it.

I havnt used the fob and don't think it has central locking. But now I'm thinking maybe it does. I've pressed the buttons on fob before and it does nothing.

When the alarm kept turning itself on and then off I put the key in thinking this would turn the alarm off. It didnt, so I started it up and the alarm kept going.

In the end I had to disconnect the battery. Is there another way of stopping the alarm going off?

Cannot really help with the main question here but on my later 2010 Defender I had the alarm going off at night for no reason -especially on cold nights. Was due to battery voltage fluctuations. The alarm was seeing this as someone tampering. Eventually I replaced the battery and it never re-occurred.

Thanks, I'll charge the battery up to full and see if that does anything

The really basic solution is remove alarm and immobiliser... who needs one if you have Lucas electrics!
A hidden cut out switch somewhere- simple rocker switch in the dash marked ' winch lights' or such like is also a handy immobiliser.

Other options- the key fob battery may be dying- at least eliminate that one before doing more work. Checking the 12V battery, as suggested above, also makes sense.

The alarm and immobiliser may be playing up- depending on what the other bits are you had done, there could have been something to disturb them ( iffy contact etc) , but finding it is going to be a pain in the neck.

Alpinewoodsman said:

The really basic solution is remove alarm and immobiliser... who needs one if you have Lucas electrics!
A hidden cut out switch somewhere- simple rocker switch in the dash marked ' winch lights' or such like is also a handy immobiliser.

Other options- the key fob battery may be dying- at least eliminate that one before doing more work. Checking the 12V battery, as suggested above, also makes sense.

The alarm and immobiliser may be playing up- depending on what the other bits are you had done, there could have been something to disturb them ( iffy contact etc) , but finding it is going to be a pain in the neck.

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Thanks, I just looked at the fob. Looks like it's a toad one. Just ordered a battery, so will try that first as you suggested. Otherwise I'll look for where the sound comes from (I'll need the alarm to go off to do that tho . )Then rip it out.

Check the bonnet alarm switch on the bulkhead near the clutch master cylinder is straight and not leaning over to one side, this is a common cause of spurious alarms due to the bonnet not pushing the switch down fully. The rubber cover can split over time as well which adds to the switch leaning problem.

Scooby22 said:

Check the bonnet alarm switch on the bulkhead near the clutch master cylinder is straight and not leaning over to one side, this is a common cause of spurious alarms due to the bonnet not pushing the switch down fully. The rubber cover can split over time as well which adds to the switch leaning problem.

Click to expand...

Thanks. This solved the problem. I was adjusting the bonnet the other day to fit more flush. Looks like it leaned. Thanks a lot.