2005 silverado adding amp

hi searching around i did find the wire colors and the location of the amp to wire in line-converter. my question is for the remote turn-on. i was wondering if there is one on the factory amp you can tie into so it will turn off with the radio. or is the only option at the head unit or switched wire at the ignition harness Thank you what i am installing is an Q-logic enclosure for under the back seat of a four door. with an infinity 100.9w if it will fit in the box??? and will be running an older amp from my old pickup ether the precision power PC2150 or the smaller PC275

did not think this was going to be a hard one to answer

brown at the ignition harness. make your own rap (Retained Accessory Power)relay(s) to shut down when a door opens (like the factory radio does after turning off the ignition). or lastly you can test at the bcm, there's a wire there that will act as rap. don't have the info in front of me though for the pin location and wire color. could use a signal sensing line out converter that will provide a remote out . . . but i don't care for them