HK Drive and Play on 04 Malibu - ACC wire questio

I installed a HK Drive and PLay on my Malibu, and it ahs an option to have the red wire connect to your ACC so the unit powers on and off with your car. I am rather new at doing this, so I am wondering where I should tap into for this. Which would be the best and easiest to get to if my HK unit is behind the Climate controls?

Thanks for your help.

Well, if the red wire you're refering to is in the ignition harness, then I think you have 2 options, either remove the instrument cluster to access the ignition switch and harness, or remove the radio head and access the ignition switch harness. Either way, it's a pain in the ass...