Member Since: 09 Nov 2018
Location: Enniscorthy
Posts: 7
alarm going off none stop
The alarm on my discovery is driving me insane. It goes off when I open the doors, when I open the bonnet, it goes off none stop when I leave the key in the ignition and the engine wont even crank. Would anyone have any idea whats going on???
10th Nov 2018 11:30 pm
kajtzu
Member Since: 11 Aug 2017
Location: Helsinki
Posts: 6570
Usually the bonnet sensor is the problem with alarms but I don’t think it prevents cranking - it only makes the alarm go off at random times. I had that on my D4 and the whole neighborhood knew about it, too, in the middle of the night.
Really weird problems with electricity are sometimes water related, so, might you perhaps have the water around the cabling somewhere? Is your cabin air filter wet or the carpets?
It would be VERY useful if you had a code reader around somewhere to query what the vehicle thinks...
10th Nov 2018 11:52 pm
DiscoJeffster
Member Since: 27 Feb 2016
Location: Perth
Posts: 204
Is your car battery healthy?
11th Nov 2018 12:40 am
Darbuck
Member Since: 09 Nov 2018
Location: Enniscorthy
Posts: 7
The jeep has been sitting unused for quite some time. The battery was dead but was swapped for a good one. The key battery is also dead as the buttons don't lock/unlock. I can't leave it in the ignition to charge at the moment because of neighbours and the alarm constantly going off.
11th Nov 2018 4:47 am
Discomadness
Member Since: 19 Jan 2015
Location: Caerphilly
Posts: 2256
Dead battery can cause all sorts of issues. If your key is dead also perhaps the immobiliser doesn’t recognise the key ?Jarrod
Current : D3 2007 HSE - AKA the lemon
-beanie grille
-detango with led bulbs
-club body off rebuild. TWICE.
11th Nov 2018 4:56 am
Darbuck
Member Since: 09 Nov 2018
Location: Enniscorthy
Posts: 7
I was thinking the same. I just hope its not a problem with wiring.
11th Nov 2018 5:41 am
Bardley
Member Since: 02 May 2018
Location: Hertfordshire
Posts: 440
First thing is to get a quality replacement battery in the key. You'll then have a good signal to the car system.
If you can get the car plugged in, that will likely give you an idea where to look and may well pinpoint your problem.2011 MY D4 HSE
Previously 2001 D2 TD5, 1996 D1 300Tdi, 1985 90 2.2 petrol.
Bikes! KTM, BMW, British, Classics and others.
11th Nov 2018 6:46 am
kajtzu
Member Since: 11 Aug 2017
Location: Helsinki
Posts: 6570
The D3 key fob battery charges when the key is inserted into the ignition. Replacing the battery in a D3 key isn’t so straightforward as in with a D4. In the former it is soldered to the PCB, in the latter its a simple job of replacing the CR battery.
11th Nov 2018 9:42 am
Bardley
Member Since: 02 May 2018
Location: Hertfordshire
Posts: 440
Ok. Does the alarm system have to 'see' the key to disable the immobiliser?
Unlocking without the button can cause all sorts of issues. Worth disabling if possible (like on a D2).2011 MY D4 HSE
Previously 2001 D2 TD5, 1996 D1 300Tdi, 1985 90 2.2 petrol.
Bikes! KTM, BMW, British, Classics and others.
11th Nov 2018 9:56 am
kajtzu
Member Since: 11 Aug 2017
Location: Helsinki
Posts: 6570
The suggestion to take a look at the key is a good one, IMO. I think the battery on it is only used for remote locking/unlocking operations. Mechanical, opposed to electronic, unlocking of doors doesn’t really disable the alarm. What disables it is AFAIK inserting the key into ignition and cranking. This would imply that the key needs to be recognized by the vehicle somehow - communication over ISM band would be my guess. I’ve looked at the comms when opening/closing doors with a software defined radio out of curiosity but haven’t done that when starting the vehicle.
I’m not aware of a way to disable the alarm completely. Only thing I know that can be disabled is interior/tilt alarm sensors (if present) by pressing the lock button twice.
I would still suggest that the OP have a code reading done even if it seems like the root cause would be faulty/dead key (at least) as we all are guessing
11th Nov 2018 10:26 am
Darbuck
Member Since: 09 Nov 2018
Location: Enniscorthy
Posts: 7
Ok guys Ive had a key guy out and he says the one and only key I have is dead. He tried to program a new key to the jeep but no joy. Is it possible to program a key to the jeep without having a working one present or am I looking at a trip to Land Rover?
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