See also:

Headphones
A. Battery cover B. Channel 1 or 2 switch C. Power button D. Volume control E. Power indicator light The RSE includes two 2-channel wireless headphones that are dedicated to this system. Channe ...

Diagnostics
OnStar Vehicle Diagnostics will perform a vehicle check every month. It will check the engine, transmission, antilock brakes, and major vehicle systems. It also checks the tire pressures, if the vehic ...

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 ...