Alarm go’s off with no sound the lights blinking(blinking in a sequence?), inner light are on.
When switching off with the remote, the sound from the horn is disturbed(false).
Switching it on again, and the sound is again “disturbed”, its go’s off shortly again.
Can start, everything works.
Normal when switching on the alarm and the sound is ok, normal beeps.
Looked on the site, but cannot find the same.
Any idée?

 

Update,
Ok now going off with sound!!!!!
Pulled fuse 9 thanks for the tip!!
Alarm battery is the most likely I think?

 

yes you need to replace alarm siren just did mine last week under cowl in front of windshield not a bad job ! Batteries go bad inside siren & eat up board inside ! I didnt even know the siren had batteries til someone told me here !!! I bought new mercedes benz siren on ebay from bmw mercedes dealer got a great price of 120 with free shipping !