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:
Power Door Locks
Press or
on the Remote Keyless Entry (RKE) transmitter.
See Remote Keyless Entry (RKE) System Operation .
Premium Trim Shown, Up-Level Similar
(Lock): Press to lock the doors.
(Unloc ...
Automatic Transmission Fluid
How to Check Automatic Transmission Fluid
It is not necessary to check the transmission fluid level.
A transmission fluid leak is the only reason for fluid loss. If a leak
occurs, take the vehi ...
Instrument Panel
CTS Shown, CTS–V Similar
A. Air Vents.
B. Driver Information Center (DIC).
C. Instrument Panel Illumination
Control.
D. Turn and Lane-Change Signals.
E. Instrument Cluster.
F. Windshield Wip ...