Not sure what you mean by accessing settings on the go or mirror your phone (since that’s android). CarPlay is mirroring your phone only it’s for an iPhone not android. Settings are always available. The parking brake wire is normally just for watching DVD’s but the DMH-4660NEX doesn’t have a DVD or CD mechanism. I do know on my Pioneer the parking brake wire goes to the power side of the parking brake wire instead of the ground side so I had to buy an adapter to simulate it, so I can watch DVD’s in motion although I’ve never even used that.Nice! I bet you’re excited to get going with AirPlay.
Since you’re wiring it up yourself... mind as well connect the parking brake wire to a screw on the chassis of the Pioneer so you can access settings and mirror your phone to it, etc while on the go. This method worked on my Kenwood, but not exactly sure it will work on Pioneer. You’ll definitely want to test it before finalizing the install.
Anyone know if this works on Pioneer?