Hi
There are a few basic things to check. Are you using the right USB port? Only the 1.5A will support Carplay. The other one is charge only and won't recognize your phone as Carplay compatible. Have you tried a different iphone? It doesn't take much fluff etc in the phone socket to cock things up. On first use it should auto detect your phone. You can download the manual here and its on page 390 but very basic because it should just work! My daughter uses Carplay and it's very fussy with cables. You've obviously eliminated any issues there. I use Android auto on my 2019 CRV and it took a bit of perseverance to get it going initially. It needed an APP update on the phone. There' also quite a few videos on Youtube that may help?

https://www.honda.co.uk/content/dam/local/uk/cars/owners/manuals/2019%20CR-V%20Owners%20Manual.pdf

 

Hey Dave, yep I was using Apple cable. Took it to Honda today and it’s looking like a bigger issue than anything. Told me it might be a screen or a component inside the hardware for CarPlay

 

Have you got Bluetooth on? It needs Bluetooth for calls and cable for audio and apps unless you've got wireless Carplay. Even if you're not using it for calls it won't work without bluetooth. It's definitely worth trying another iphone if you can. Do you know if android auto works? Can you try your iphone in a different car? As you can probably tell I'm not a believer in Car dealers especially when they suggest a solution thats probably going to be expensive!