Horn
Pressa 
on the steering wheel pad
to sound the horn.
See also:
Customer Assistance for Text Telephone (TTY) Users (U.S. and Canada)
To assist customers who are deaf, hard of hearing, or speech impaired and who use Text Telephones (TTYs), GMC has TTY equipment available at its Customer Assistance Center. Any TTY user can communicat ...
Parking Brake
To set the parking brake, hold the regular brake pedal down, then push the parking
brake pedal down.
If the ignition is on, the brake system warning light will come on. See Brake
System Warning ...
Ignition Positions
The ignition switch has four different positions.
In order to shift out of P (Park), the ignition must be in ON/RUN or ACC/ACCESSORY and the brake pedal must be applied.
Notice: Using a tool to fo ...