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 vehicle is equipped with the Tire Pressure Monitoring System. If a diagnostics check is needed between e-mails, push 
, and an Advisor can run a check.
See also:
Introduction
The names, logos, emblems, slogans, vehicle model names, and vehicle body designs appearing in this manual including, but not limited to, GM, the GM logo, GMC, the GMC Truck Emblem, and SIERRA are ...
Inserting a CD(s) (Six-Disc CD Player)
LOAD : Press to load CDs into the CD player. This CD player holds up to six CDs.
To insert one CD:
1. Press and release the LOAD button.
2. Wait for the message to insert the disc.
3. Load a CD. I ...
Driver Information Center (DIC)
The vehicle may have a Driver Information Center (DIC). It displays information
about the vehicle and warning messages if there is a system problem detected. DIC
messages display in the center of ...