Margal

I stared to get the bulb out bing sound and mark in cluster intermediately but not in idrive. all bulbs are working when i woked arounf the car. checked the error codes in INPA also but only found 9D12 which is siren battery related. anybody have any idea what might be the problem?

twh

Pretty sure it means the battery that is in the siren itself is no good. The siren has it's own internal battery. Here is one from RealOEM:
RealOEM.com * BMW E60 530xi Alarm systems

I have seen online that some of the sirens can be opened and you can get a replacement battery (not from BMW). BMW will only sell you a new part.

As I recall it is somewhere in the rear of the car, maybe under the bumper or one of the wheel wells.

Margal

Thanks for this
Do you think the bulb massage in cluster is coased buy siren battery? I'll try to get it out and replace the battery. Is this located under the left rear wheel well?

twh

Should be here:

txag_530i

DWS Siren Battery Replacement

seanjordan20

Are you sure your angel eyes are not out. That might be the bulb that is out.