Here’s how to pair your iPhone with SYNC 3:
Start your vehicle, and power on your iPhone.
Enable your iPhone’s Bluetooth® feature.48
From the Feature bar on the bottom of the SYNC home screen, press Settings > Bluetooth > Add a Bluetooth Device.
Go back to your iPhone’s Bluetooth settings.
Both your iPhone and SYNC touchscreen should now display a six-digit PIN.
If you’ve previously paired an iPhone with the same device name as the iPhone you’re currently trying to pair, you may need to:
Delete SYNC from your iPhone.
Delete your iPhone from SYNC.
Pair your iPhone again.