I have figured out from the forums that the part number indicated is the alarm control module. It is still connected as originally installed from the factory, but I just noticed a persistent ticking noise coming from the box.

Ticking happens whether the key is in the ignition or not.

Any idea what's going on with this piece? If I simply disconnect the connector, I would assume the ticking would go away, but do I need this box? What functionality do I lose by disconnecting the box?

Part Number stuff on box:
000 820 52 26
BAW 840 Z 0008