GMC Sierra 2015 Owner's Manual page 240

While the active call is handset,
select the Hands-Free screen
button to switch to the
hands-free mode. The screen
button changes to Handset once
the Bluetooth device confirms it
is operating as hands-free.
Pairing
A Bluetooth-enabled cell phone
must be paired to the Bluetooth
system and then connected to the
vehicle before it can be used. See
your cell phone manufacturer's user
guide for Bluetooth functions before
pairing the cell phone. If a Bluetooth
phone is not connected, calls can
be made using OnStar Hands-Free
Calling, if available. See OnStar
Overview on page 14-1.
Pairing Information
Up to 10 cell phones can be
paired to the Bluetooth system.
The pairing process is disabled
when the vehicle is moving.
Pairing only needs to be
completed once per phone,
unless the pairing information on
the cell phone changes or the
cell phone is deleted from the
system.
Only one paired cell phone can
be connected to the Bluetooth
system at a time.
If multiple paired cell phones are
within range of the system, the
system connects to the most
recently connected device. To
connect to a different paired
phone, see Connecting to a
Different Phone after in this
section.
Pairing a Phone or Device
1. From the Home Page, turn the
MENU knob to access the
PHONE screen button, then
press the MENU knob to select
the PHONE screen button. If a
device has been previously
paired, the main Phone menu
Infotainment System
will be shown. If no devices
have been paired, Step 2 can be
skipped.
2. Turn the MENU knob and press
to select Manage Phones.
3. Press the button just below the
PAIR/screen button. A four-digit
Personal Identification Number
(PIN) appears on the display.
The PIN may be used in Step 5.
4. Start the pairing process on the
cell phone to be paired to the
vehicle. See the cell phone
manufacturer's user guide for
information on this process.
5. Locate the device named GMC
IntelliLink in the list on the cell
phone. Follow the instructions
on the cell phone to confirm the
four-digit code.
After the PIN is successfully
entered or the code is
confirmed, the system confirms
the pairing process is complete.
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