The alarm on my BMW Z3 goes off by itself, it goes when you are physically driving the car, if you disconnect the battery the alarm still goes off. I have tried using the central locking to open and close the doors which should deactivate it but it doesn't. Any ideas ????????????? It is not constantly just when it feels like it but you never know when it is going to do it.

Angela Milligan, July 2007

Don't waste your time. Go straight to the left side of the boot and lift back the felt facing to reveal the well over the wheel arch. Chances are that it has a couple of inches of water in it covering the alarm's 'brain'. Dry it out and all your problems should go.

Mike, March 2016

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Hi. i want to know how to reset a bmw key,?

its a bmw e39 5series and wanting to know how to reset the key

thanks
5 years ago
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Black Panther Black Panther



Best Answer - Chosen by Asker

There are 2 types of key so here is the info for both.
Type 1
System operation
Pressing lock button activates alarm, central locking, immobilizer and double locking system.
Some models:
Holding key lock button in depressed position closes windows and then sunroof.
If key lock button is released accidentally, proceed as follows (if fitted with alarm system):
Briefly press and release unlock button.
Press and hold lock button.
Alarm system gradient sensor and interior movement sensor can be deactivated, proceed as follows (if fitted):
Briefly press key lock button after activating alarm, central locking, immobilizer and double locking system.
Alarm system gradient sensor and interior movement sensor are switched off until alarm, central locking, immobilizer and
double locking system are deactivated.
Programming
When
Key batteries completely discharged.
Key batteries not replaced within 60 seconds.
Key added or replaced.
DO NOT press remote control buttons during battery replacement.
How
Unlock vehicle.
Enter vehicle. Close driver's door.
Switch ignition ON and OFF.
Remove ignition key.
Press and hold unlock button.
Press lock button briefly 3 times within 10 seconds keeping unlock button depressed.
Release unlock button .
Some models: LED flashes slowly for 10 seconds.
Some models: Central locking system locks and unlocks rapidly to indicate correct programming.
Some models: Repeat above procedure if central locking system does not work and LED does not flash or LED flashes
continuously.
NOTE: A maximum of 4 keys can be programmed. Carry out programming procedure for each key within 30 seconds.
Type 2
System operation
Pressing lock button activates alarm, central locking and double locking system.
Holding key lock button in depressed position closes windows and then sunroof.
If key lock button is released accidentally, proceed as follows (if fitted with alarm system):
Briefly press and release unlock button.
Press and hold lock button.
Alarm system gradient sensor and interior movement sensor can be deactivated, proceed as follows (if fitted):
Briefly press key lock button after activating alarm, central locking and double locking system.
Alarm system gradient sensor and interior movement sensor are switched off until alarm, central locking and double
locking system are deactivated.
Programming
When
Key added or replaced.
How
Unlock vehicle.
Enter vehicle. Close driver's door.
Switch ignition ON and OFF.
Remove ignition key.
Press and hold unlock button.
Press lock button briefly 3 times within 10 seconds keeping unlock button depressed.
Release unlock button.
Central locking system locks and unlocks rapidly to indicate correct programming.
Repeat above procedure if central locking system does not work.
NOTE: A maximum of 4 keys can be programmed. Carry out programming procedure for each key within 30 seconds.
Hope this helps.
Good luck.

Ollie, April 2013

It could be an insect however the common problem seems to be the siren itself, there is'nt a way to fix this problem yourself, the siren is located in the engine compartment and under a platic cover which cannot be opened yourself. My mother is having the same issue and has been told by BMW that the problem is a fault with the siren, which can be disbaled by an engineer that will cost £45 but this is only a temporary solution, it will need to be taken into a garage and have the siren replaced.

Quinten, December 2009

Same problem, an electronic engineer said there could be an insect/spider in the car, he was correct, 1 spider behing sunvisor and the other in the door itself.
hope this might help.

Nigel of Saxondale, August 2009

HOW DO I RESET MY ALARM,on my bmw z3 2.8 1998

Gary scott, August 2009

same problem too!

kian, March 2009

was just looking for a answer to the very same question !!!!! help

jeremy, July 2008