If the screen is a 7" one you wont have access to the button... you will also need to take off the outer casing to get it to fit nice and snug
What Pioneer do you have, you should have an aux in hopefully
I do have a Pioneer AVH3200BT, I assume this as a aux in, not yet checked. Need to check the specs on internet.
That's why I am looking for a tablet where you don't need the acces button to startup, but can also touch the screen.
Thanks,
Peter