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:
Brake System Messages
SERVICE BRAKE SYSTEM
This message displays along with the brake system warning light if there is a problem with the brake system. See Brake System Warning Light on page 5‑27. If this message ap ...
Heated Mirrors
For vehicles with heated mirrors:
(Rear Window Defogger): Press to heat the mirrors. If the vehicle has a towing mirror, only the upper glass of the mirror is heated.
The lower convex part of the to ...
Erasing Speed Memory
The cruise control set speed is erased from memory by pressing or if the ignition is turned off. ...