Thanks for the quick answers so far-

Clarification:

I would like a signal (any kind- +5V/GND/+12V), anything when the unit is in standby mode. So that while the car is parked in the garage of my home, it will receive updates.

The standby signal will power a relay which will switch power for the wireless bridge connected to the ethernet port.

Since I have my standby time at 30 mins, after 30 mins the empeg and the wireless bridge will shut off and my battery will be saved.

If there is no known way of detecting standby externally, does anyone know of a pin/pad internally I could tap?

-Ed