Unable to connect to the car head unit

1. Check whether the original car has a CarPlay function and whether that mode has been selected.

2. Check whether the USB cable is inserted correctly, firmly and fully in place as described in the manual.

3. Try connecting to another USB port of the original car, and do not plug other devices into the other USB ports.

4. Restore the original car system to factory settings and then reconnect.

5. Replace the USB cable (you can replace it with an Android phone data cable).