WTF Is That Noise...The Motor's Off And I'm Not Moving?? My 3 is Haunted...

[Viet Nam Vette]

This is the secod time I've heard this on my 2007 H3. Once before while I had the hood up installing a new Horn set up ..and 2 days ago while the hood was up installing a connection to the battery for an external charger.

The motor is off and the key is not in the ignition.

It's this clicking sound that appears to be coming from near the Master Cyl on the firewall. It doesn't start right away but a few min later. I hear this click about every 2-3 seconds. Of course after I shut the hood I can't hear it any longer.

WTF is that all about..???