Aftermarket amp install

[03GMCSonoma]

07 Malibu Ls. Using factory radio. I want to install additional amp and sub in trunk. Question is this, does the factory radio have an output for remote amp turn on circuit? Or does it have a power antenna output that I could use for this? And if it has the power antenna output, does it stay powered up while listening to a cd? I realize that I can use any key on power for this but I prefer to let the radio control the amp if possible.

[Stealthee]

If you used an antenna wire it would only be powered when listening to the radio itself. It would not work with CD's. I doubt there is a separate amp turn on, but you could tie into the accessory on going to the radio. That would allow the amp to stay on with the radio even after you shut the car off until you open your door.

Also, in case you don't know in order to put an aftermarket amp in you are going to need to install a line level converter as the factory radio does not have auxillary (rca) outputs.