Bluetooth advice

I have a Kenwood head unit in my truck. Started having problems with the Bluetooth connecting as it took a while to connect to my S8. I tried to unpair it then pair it again and it won't pair with my phone. I know the Bluetooth works on my phone because it pairs with everything else. I did just get this phone so I tried to set it up in my truck and the set up button on the steering won't work all the other ones do just not that one. I do have a Idata thing on there. aux won't work either but USB does. I updated the firmware and tried disconnecting the battery for a bit and still doesn't work. So is it because I can't set it up in my truck or the head unit?