All of a sudden, I get this error when I get in my car: "Accessory Not Supported, This accessory is not supported by this device." The iPhone is no longer connected to my head unit in the Honda Civic for hands free calling and it no longer connects to CarPlay using the Lightning cable. This is a NEW problem. Both of these functionalities have been working great for a year now. I'm using iOS 15.5 on an iPhone 11 Pro.
You will get that message if the phone is not unlocked when you plug it in; the port is disabled after the phone has been locked for over an hour as a security measure. You can turn this feature off in Settings/Face ID [Touch ID] & Passcode, USB Accessories. To turn the feature off turn the switch ON (I know, strange).
The other possible causes are a defective cable, or dirt in the Lightning port on the phone. Clean it with a bright light to see and a toothpick.
You will get that message if the phone is not unlocked when you plug it in; the port is disabled after the phone has been locked for over an hour as a security measure. You can turn this feature off in Settings/Face ID [Touch ID] & Passcode, USB Accessories. To turn the feature off turn the switch ON (I know, strange).
The other possible causes are a defective cable, or dirt in the Lightning port on the phone. Clean it with a bright light to see and a toothpick.
Your response said: " it no longer connects to CarPlay using the Lightning cable. “ so for some reason 2 of us assumed that the problem was plugging in the phone. If it happens when the cable isn’t plugged in go to Settings/Bluetooth and “forget” the card, and also do the same in the head unit. Then set it up again.
dirt or lint in the connector can cause that
as can a defect cable or defect connector
Your phone can’t connect by any method. That’s why it is at exactly the same time. The trust relationship between the head unit and your phone was broken for some reason. But if you had said that it didn’t work with Bluetooth OR the cable the first time it would have simplified responding.
From here I can only speculate, but I suspect that the certificate in the head unit expired, and its firmware needs to be updated.
It’s likely that the message referred only to the Bluetooth connection, and it might have been local BT interference→Resolve Wi-Fi and Bluetooth issues caused by wireless interference - Apple Support.
Or just rebooting the head unit fixed it. As I’m sure you know the maxim that goes back centuries: “When in doubt, reboot” 😏
It gives me this error WITHOUT connecting any wire. Just stepping into my car with the phone. It’s not a cable problem, it’s not a dirty connector. I’m not wired to anything and it gives me that error.
Thank you for your reply. I apologize for being unclear. I went out at lunchtime and everything is working as it should. I never did anything. It just started working again. LOL What in the H-E double hockey sticks? Solar flare possibly?
So at the exact same time that my iPhone would not connect using Bluetooth to the head unit is the exact time that my cable became dirty and I can't connect by wire to my head unit either?
Accessory Not Supported
