Call Waiting
Call waiting must be supported on the cell phone and enabled by the wireless service carrier.
• Press 
to answer an incoming call when another call is active. The original call is placed on hold.
• Press again to return to the original call.
• To ignore the incoming call, no action is required.
• Press 
to disconnect the current call and switch to the call on hold.
See also:
Powertrain details
The GMC Sierra All Terrain HD concept is propelled by the new, production
6.6L Duramax turbo-diesel V-8 and Allison 1000 six-speed automatic transmission
powertrain combination offered in the 2011 ...
Third Row Seats
The third row seatbacks can be folded forward, and the seats can be removed.
To fold the third row seatback:
1. Remove anything on or under the seat.
2. Disconnect the rear safety belt mini-lat ...
Dual Automatic Climate Control System
The heating, cooling, and ventilation in the vehicle can be controlled with this system. The vehicle also has a flow-through ventilation system described later in this section.
A. Driver and Passeng ...