So currently I am driving a 2007 Scion TC which just has the stock radio and I am looking to upgrade to a head unit that has android auto. The steering wheel has 5 buttons on it - volume up, volume down, arrow up, arrow down, and the mode select button. How can I ensure that I will still be able to use the steering wheel buttons as controls for the unit? Are there any units that maybe come with a control module for the purpose of non-distracted control of the unit while driving, like modern cars have stock with steering wheel controls or something similar?