Audio System
When using the Bluetooth system, sound comes through the vehicle's front audio
system speakers and overrides the audio system. Use the VOL/
knob during a call to change the volume level. The adjusted volume level remains
in memory for later calls. The system maintains a minimum volume level.
See also:
Customer Assistance Offices (U.S. and Canada)
GMC encourages customers to call the toll-free number for assistance.
However, if a customer wishes to write or e-mail GMC, the letter should be addressed to:
United States
GMC Customer Assistance ...
Navigation
OnStar navigation requires the Directions and Connections service plan.
Push to receive directions or have them sent to the vehicle navigation screen. Destinations can also be forwarded to the vehic ...
Hydroplaning
Hydroplaning is dangerous.
Water can build up under the vehicle's tires so they actually ride on the water. This can happen if the road is wet enough and you are going fast enough. When the vehicle i ...