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:
Dolly Towing
(Rear-Wheel-Drive Vehicles)
Use the following procedure to dolly
tow a rear-wheel-drive vehicle from
the rear:
1. Attach the dolly to the tow
vehicle following the dolly
manufacturer's instructions.
2. Put the rear w ...
When the Light Is On Steady
This indicates that one or more of
the tires are significantly
underinflated.
A Driver Information Center (DIC)
tire pressure message may also
display. See Tire Messages. Stop as soon as
po ...
Listing Stored Numbers
The list command will list all the stored numbers and name tags.
Using the “List” Command.
1. Press . The system responds “Ready,” followed by
a tone.
2. Say “Directory.”
3. Say “Hands Free C ...