GMC Sierra Owners Manual
For vehicles with a Bluetooth system, it allows users with a Bluetooth-enabled cell phone to make and receive hands-free calls using the vehicle’s audio system and controls.
The Bluetooth-enabled cell phone must be paired with the Bluetooth system before it can be used in the vehicle. Not all phones will support all functions. For more information, visit www.gm.com/bluetooth.
For more information, see Bluetooth on page 7‑50.