Try:
- Contacts the car system developer/go to their support site
- Reset the iOS device. Nothing will be lost
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Reset the care system
- Reset all settings
Go to Settings > General > Reset and tap Reset All Settings.
All your preferences and settings are reset. Information (such as contacts and calendars) and media (such as songs and videos) aren’t affected.
- Restore from backup. See:
Restore your device from an iCloud or iTunes backup - Apple Support
- Restore to factory settings/new iOS device.
Sometimes and iOS update breaks compatibility between the device and car system. In that case you have to wait for ether a firmware update to the car system or iOS update
mercdv wrote:
Same thing happened to me after iOS 9 update when attempting to connect to my truck over usb. My truck is a 2015 Tundra.