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 
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Advisor can run a check.
See also:
Automatic Headlamp
System
When it is dark enough outside, the
automatic headlamp system turns
on the headlamps at the normal
brightness, along with the taillamps,
sidemarker, parking lamps, and the
instrument panel l ...
Automatic Operation
AUTO (Automatic): The system
automatically controls fan speed,
air delivery, and air conditioning in
order to heat or cool the vehicle to
the desired temperature. When the
indicator light is ...
Dual Automatic Climate Control System
A. Fan Control
B. Power
C. AUTO (Automatic Operation)
D. ZONE
E. Defrost
F. Air Delivery Mode Control
G. Driver and Passenger Temperature Controls
H. Driver and Passenger Heated and Ventila ...