When it comes to CarPlay, Apple doesn̵
First, connect your iPhone to your vehicle with a USB to Lightning cable that includes CarPlay (unless your car or truck supports wireless connections). After starting CarPlay, tap the App Grid button in the lower left corner of your infotainment display. This step is only required if you are viewing the overview screen or an open app.
Next, select the “Settings” app. You may have to swipe between home screens to find the application.
From the Settings menu, tap the Wallpaper option.
You will now receive several background images, the appearance of which changes when CarPlay is in dark or light mode. Select one of the available wallpapers to see a live preview on your main device.
Select the “Set” button if you like the look of the wallpaper. If not, tap the Cancel button and choose a different wallpaper.
Unfortunately, at the time of writing, you cannot use your own photo as your wallpaper in CarPlay. But don’t worry, changing the wallpaper on CarPlay will not change the background of your iPhone.
CONNECTED: How to customize the Apple CarPlay screen