What does the ETAX relay control?

Why would it being clicking with no key in the ignition?

Likewise, why would the ASD (automatic shutdown relay) also be clicking w/ the key out of the ignition? I pulled the relays involved (ASD first, ETAX kept clicking, then pulled it...)

This is a 2007 Chrysler Aspen, 5.7 hemi, 4WD. There was a check engine light for a bad EGR valve...replacing it right now.

Put the relays back in and unplugged the battery for a bit (after charging it...I figured the battery was likely drained before I let the dogs out and heard the clicking), car started right up.