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:
Voice Recognition
The voice recognition system uses commands to control the system and dial
phone numbers.
Noise: The system may not recognize voice commands if there is too much
background noise.
When to Speak ...
Starting the Vehicle with a Low Transmitter Battery
If the transmitter battery is weak, the DIC may display NO REMOTE DETECTED
when you try to start the vehicle. The REPLACE BATTERY IN REMOTE KEY message
may also be displayed at this time.
To star ...
Brake Fluid
The brake master cylinder reservoir is filled with DOT 3 brake fluid as
indicated on the reservoir cap.
See Engine Compartment Overview for the location of the reservoir.
There are only two ...