Problem with the new Apple phone’s open wireless connection

I recently got the latest version of Apple mobile phone. My previous phone used to connect easily to my Nissan sedan and I had no problems for the past 12 months. Now that I am using the new phone, the basic call-text functionality works whenever I connect it to my car but prompts that it has to establish connection if the open wireless connection is activated. The automobile system prompts that it is still establishing the connection by the phone indicates that connection had already been established. Even if I refresh and reboot my phone, this issue seems to persist.
Then, I tried to attached the phone to that automobile as an auxiliary unit and removed all open wireless connection records and just had the Apple phone as the connected unit but it still had the same problems. I can't seem to establish connection for sounds, how do I resolve this?
Thank you!
