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:
Playing a CD (in Either the DVD or CD Slot)
If the ignition or radio is turned off with a CD in the player, it stays in the player. When the ignition or radio is turned on, the CD starts playing where it stopped, if it was the last selected aud ...
Safety Chains
Always attach chains between the vehicle and the trailer. Cross the safety chains
under the tongue of the trailer to help prevent the tongue from contacting the road
if it becomes separated from t ...
Transfer Case
Refer to the Maintenance Schedule to determine how often to check the lubricant
and when to change it. See Maintenance Schedule on page 11‑3. ...