My 2011 Rav4 has changed the function of the radio buttons – although not consistently. When the unit is off, turning it ON will cause the CD player to eject a CD. The display goes to nonsense characters. Others buttons are equally erratic.
This morning, the unit was OFF. i pressed station preset #1, it immediately ejected a CD. No buttons would work to regain control except OFF (sometimes).
If you replace it yourself, I strongly recommend getting an adapter plug. It’ll adapt your new head unit to plug directly into your original equipment wiring harness. Butchering it in is a serious no-no.