01 Caravan, remote turn on

Installing an aftermarket radio into a late model 01 Dodge Caravan.  Pretty standard stuff using Metra’s Chrysler harness (1817).  Turns out there was an amp in the vehicle but the remote turn on wire wasn’t in the factory harness.  Verified this by testing the harness for impedance on the factory speakers; there wasn’t a connection until the factory radio was on (yes it played).  I did a little research and found that there is supposedly a “digital remote turn on switch” for this factory amp.  No clue how to use it though. 

On the back of the factory radio was the bolt that held the braided ground wire and the other little ground wire on the tab.  The gray and black standard plugs were there.  Also what I assumed to be the single wire for steering wheel controls in the white harness.  When hooking up the aftermarket radio, it turns on and runs fine.  No problems at all with switched power, constant or ground.  But the only time I could get any output on the speakers is when I connected the small ground plug directly to ground.  This only turned the factory amp on for a minute and it died as soon as I tried to start the car. 

Anyway to do this without bypassing the factory amp?

personallly I just bypass the amp on those vehicles I've seen numerous times factory amps frying out when you integrate the aftermarket radio to them.