Haunted Land Rover?

[Clive]

I had an erratic alarm in a car once when the battery was close to the end of its useful life. I don't know why, but a fresh battery seemed to cure it.

it’s this. ^^^^

 

[Wurzeetoo]

it’s this. ^^^^

Are we sure it’s not connected to the amityville horror?

 

[CPF]

Absolute conkers!
No way on earth is this load of hogwash true; you ain’t got any mates.

You’re absolutely right I have not got any mates . they’re all fans

 

[DeeGee]

Happens to my Freelander all the time. Nobody knows why it just goes off at random whenever it feels like it.

Luckily after about ten or fifteen seconds it stops of its own accord, when the scousers have cut the wires.
Anyway they soon bring it back when the rats pop their heads out of the dashboard where the air vents used to be: and then it will go off again the next day when the wife has parked up at Sainsbury's.

 

[CPF]

[/QUOTE]for Dee gee look things up first before you slag someone off when his range Rover disappeared he was pi—- off he told the story to the policeAlarm kept going off and he still have the keys The car gone and they said it was electronic stealing of the vehicle

 

[Dry Rot]

Battery on one key fob was a bit over 3v and 2.8v on the other. (The key fob battery should be 3v). So changed the lower battery for a new one.

Also took out all the door sensors, cleaned up the contacts (one was a bit loose), and interior light goes on when any door is opened as it should.

Now seems to be fixed. But I read that the battery that powers the thing that makes the noise is re-chargable and is normally re-charged from the main battery when the vehicle is running. That battery will eventually fail with age and needs to be replaced. IF I haven't cured the problem, that's the next step. Apparently it is behind the near side headlight and accessed by removing the head light assembly.

Thanks for all the suggestions. If the problem persists, I shall work my way through them, one at a time.

 

[Dukes Fit]

Is there a micro switch on the bonnet latch?

My discovery did the same thing, grease gets in to the switch and it loses contact

 

[JWL]

There is a fair difference between the Range Rover alarm/key fob set up to a Defender especially of a 2005 vintage. These are still using the 10AS alarm from previous models and are fairly basic to those found on newer models. Yes the key fob batteries are the main cause of problems with erratic behaviour along with the door plunger/switches and then those that are also fitted with the interior barometric sensor can cause problems as they can get damp as they're often up in the roof lining and can be affected by condensation and damp. With the central locking being controlled by the fob there is a sequence where you can double press the lock button to lock with or without the interior sensor activated, this is where you can be able to lock the vehicle alarmed if the doors or bonnet are opened but leave your dog in the motor without setting the alarm off.
To increase the range of your key fob there is a mod where you extend the alarm aerial wire from the 10AS module up the door pillar into under the roof lining. Really simple modification and can be quite successful.

 

[Dry Rot]

Is there a micro switch on the bonnet latch?

My discovery did the same thing, grease gets in to the switch and it loses contact

None on the bonnet.

I forgot to say, a couple of weeks ago I came out to find the main battery quite dead. Charged it up and no problem until yesterday, so probably the same source. If a micro switch was making a bad contact, the LR would think a door was open, so leave the inside light on?

 

[roscoe erf]

for Dee gee look things up first before you slag someone off when his range Rover disappeared he was pi—- off he told the story to the policeAlarm kept going off and he still have the keys The car gone and they said it was electronic stealing of the vehicle
View attachment 874854View attachment 874854
[/QUOTE]
this is a defender it hasn't got a smart fob you don't need to read the signal to nick it

 

[roscoe erf]

Is there a micro switch on the bonnet latch?

My discovery did the same thing, grease gets in to the switch and it loses contact

yes there is and it is prone to failing

 

[Paddington]

The bonnet microswitch on my Disco needs about a minute to reset if the bonnet has just been closed. My alarm has gone off in the past at random on very warm nights and as the car is in a garage with security lights which haven't come on, I assume it's a temperature thing (though why doesn't it come on in the day ?). We have loads of bats and badgers around at night, can't think that they would set it off though.
There wasn't an alarm fitted to my old 2 door Rangie so I bought one of those Nightstick steering wheel clamps that have something like a 110dB alarm fitted. The thing would go off at will on the coldest or warmest night of the year and as we were living in row of terraced houses meant rushing out in my dressing gown to turn it off. I learnt after I had bought it from a chap who used to test them for the market that they had no temperature compensation fitted and "yes, they would do that !"

 

[Dukes Fit]

The bonnet microswitch on my Disco needs about a minute to reset if the bonnet has just been closed. My alarm has gone off in the past at random on very warm nights and as the car is in a garage with security lights which haven't come on, I assume it's a temperature thing (though why doesn't it come on in the day ?). We have loads of bats and badgers around at night, can't think that they would set it off though.
There wasn't an alarm fitted to my old 2 door Rangie so I bought one of those Nightstick steering wheel clamps that have something like a 110dB alarm fitted. The thing would go off at will on the coldest or warmest night of the year and as we were living in row of terraced houses meant rushing out in my dressing gown to turn it off. I learnt after I had bought it from a chap who used to test them for the market that they had no temperature compensation fitted and "yes, they would do that !"

I did a quick fix, pulled the connector and bridged the wires until I cleaned out the micro switch.

The bridge wire is still in there after 3 years

 

[Dry Rot]

When I Googled this problem, lots of threads came up about the Disco bonnet sensor. I had to Google "Defender" specifically to find the Defender problem. As has been said, it seems to be something Discoes do!

 

[Paddington]

Re the fob distance, have you tried the old Top Gear tip of holding the fob against your head whilst unlocking from a distance ?

 

[8100]

Reminds me of a classic episode of On The Buses when Butler had to take OLD 666 out.

 

[roscoe erf]

When I Googled this problem, lots of threads came up about the Disco bonnet sensor. I had to Google "Defender" specifically to find the Defender problem. As has been said, it seems to be something Discoes do!

its the same switch defender owners just don't moan as much as disco owners

 

[2wheels]

re my earlier post, son was called out again at 4am to an audi this time. alarm going off, flat battery again.presumably due to covid lockdown and cars not being used. the flat batteries are the car batteries not the keyfob ones.