I've got a 2009 Toyota and when I upgraded the stereo to add Bluetooth, I just didn't connect the wire from the head unit to the CAN bus. (The installation kit

I've got a 2009 Toyota and when I upgraded the stereo to add Bluetooth, I just didn't connect the wire from the head unit to the CAN bus. (The installation kit from Crutchfield included the pinout.) On a newer car, I'd probably install a toggle switch for that wire. (I'd love to hear from anyone who's actually tried that.) Edit: Also, I always open the door with the physical key, and I don't even carry the button.