Horn
Press 
on the steering wheel pad to sound the horn.
See also:
Washer Fluid Messages
WASHER FLUID LOW ADD FLUID
This message displays when the windshield washer fluid is low. Fill the windshield
washer fluid reservoir as soon as possible. See Engine Compartment Overview ...
General Information
For service and parts needs, visit
your dealer. You will receive
genuine GM parts and GM-trained
and supported service people.
Genuine GM parts have one of
these marks:
...
Pairing
A Bluetooth enabled mobile phone must be paired to the UHP system first and
then connected to the vehicle before it can be used. See the mobile phone
manufacturer's user guide for Bluetooth function ...