Also be sure to reset your radio fuse (RDO), pull it out turn on the car plug it back. This will also reset your USB's if they have stopped worked. On a Chevy 2016 Tahoe this is fuse # 29 located on the passenger side panel. Also when you restart you may need to hit the projection icon to get apple carplay going. Also be sure to use a genuine apple lightening cord. I have an Iphone 7+ with the latest OS update 14.3
How to connect:
• Lightning Connection:
• Plug your phone’s Lightning cable into the vehicle’s USB port.
• If Apple CarPlay doesn’t automatically launch, on your infotainment screen, tap the APPLE CARPLAY icon or PROJECTION icon.
• Follow the prompts on the screen and on your phone to start using Apple CarPlay.
https://my.chevrolet.com/how-to-support/entertainment-connections/bluetooth-smartphones-wifi/apple-carplay
CarPlay not working on Chevy Tahoe
If Apple CarPlay does not start on your Tahoe when you plug in the USB cable and there is no CarPlay icon in the list of apps in the infotainment system, it can be due to a number of reasons:
· CarPlay is disabled in the infotainment system settings of your Tahoe.
· CarPlay is disabled in your iPhone, go to ‘Settings > Screen Time > Content & Privacy Restrictions > Allowed Apps’ and enable both CarPlay and Siri.
· The Lightning-to-USB cable you’re using is defective. Try a different cable, preferably original Apple cable.
· The connected USB port on your Tahoe does not support CarPlay. Try other USB ports.
· A software glitch is responsible for the CarPlay problem. Reset the Tahoe’s infotainment system to its factory settings.
· You’ve an older model of Tahoe that does not support Apple CarPlay. Only 2016 and later model year Chevy Tahoe vehicles are compatible with CarPlay.
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https://www.wheelsjoint.com/apple-carplay-on-chevy-tahoe-how-to-connect/#:~:text=To connect Apple CarPlay wirelessly,settings list on your iPhone.