CarPlay is an Apple standard that enables a car radio or head unit to be a display and a controller for an iOS device. It’s available on all iPhone models beginning with iPhone 5 running iOS 7.1 or later. You can change its wallpaper to your personal preference.
- From your car’s display, open the Settings app in CarPlay.
- Select Wallpaper.
- Choose the wallpaper that you want to use, then select Set.
(This how-to is based on my experiences and info on Apple’s support pages — where the images sometimes come from.)