A:Answer Hi Thinking,
Yes, the car stereo will still work, but without connecting a phone via Apple Carplay or Android Auto, the unit is only capable of using the FM Radio, USB and Bluetooth playback. Navigation system can only be accessed once a smartphone is connected. Kindly refer to the link provided below for additional information about the unit. Thanks!
https://docs.sony.com/release//Manual_4686137213.pdf
Regards,
Sam