Turn on the vehicle and allow your iPhone to connect. Then tap Bluetooth in the iPhone’s Settings app. Select SYNC, then tap Show Notifications on the following screen.
The next time you start your vehicle, the syncing will be automatically activated.
Now when you receive a text message while driving, you’ll see a notification message on the vehicle’s screen and hear a tone. You can press the Listen button on the screen — or press or pull the Voice button and say “Listen to text message.” SYNC will read the text message to you!
Note that this feature only works if your iPhone is locked.