dagh0st

I have a 2004 BMW 530i with the original factory alarm. The car alarm randomly goes off while the car is parked. I've notice the issue three weeks ago, while the car was parked in my garage.

When I park and activate the alarm (via the key)you hear and see the doors lock, but no audible beep. When I unlock the car, the doors open and the car makes the normal two audible beeps.

Usually after I lock the car via remote and wait 10-15 minutes the alarm goes off.

Any idea whats going on?

jay77

Check all the doors and boot / bonnet are closed, look at the red clown nose under the rear view mirror when locking does it flash?

If not could be an door switch is not registering

dagh0st

Thanks for the advice. I open and close all doors as well as the trunk.

This time when i activate the alarm the car audible and the red light under the mirror is blinking.

I'll keep an eye on it.

thanks again

dagh0st

the alarm just went off again!

sanjsanj

take a video of it blinking when you lock it. there's a few speeds it blinks at...

e60oholic

Un plug or replace the hood sensor. Its the common thing that breaks. My alarm keep going off too, unplugged the hood sensor problem fixed

Roy_excellence

+1

dagh0st

I unplug the hood sensor for the past week and the resolve the problem. Thanks e60oholic for advice.

I would like to get a replacement sensor. Anybody know of a good place online that sells the hood sensor?

tgm001

I had this problem too, I replaced mine and bought it from ecstuning.com ! I do not remember the part number, but you can fint it on realoem.com

dagh0st

thanks tgm001. I will check it out