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 communicate with GMC by dialing:
1-800-462-8583. TTY users in Canada can dial 1-800-263-3830.
See also:
Setting the Tone (Bass/Treble) (AM-FM Radio and AM-FM Radio with CD)
To adjust the bass or treble:
1. Press the knob until Bass or Treble displays.
2. To adjust the setting, do one of the following:
• Turn the knob.
• Press either SEEK, or SEEK.
• Press ...
Rear Window Defogger
For vehicles with a rear window defogger, a warming grid is used to remove fog from the rear window.
(Rear): Press to turn the rear window defogger on or off. An indicator light on the button comes ...
Owner Checks and Services
At Each Fuel Stop
• Check the engine oil level.
See Engine Oil on page 10‑8.
Once a Month
• Check the tire inflation pressures. See Tire Pressure on page 10‑44.
• Inspect the ti ...