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:
Retained Accessory Power (RAP)
The following vehicle accessories can be used for up to 10 minutes after the engine is turned off:
• Audio System
• Power Windows
• OnStar System (if equipped)
• Sunroof (if equipped)
The ...
Driving with the Blind Spot Mirror
Actual Mirror View
1. When the approaching vehicle is a long distance away, the image in the main
mirror is small and near the inboard edge of the mirror.
2. As the vehicle gets closer, the imag ...
Vehicle and Power Issues
OnStar services require a vehicle electrical system, wireless service, and GPS satellite technologies to be available and operating for features to function properly. These systems may not operate if ...