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:
Dolly Towing
(All-Wheel-Drive Vehicles)
Notice: Towing an all-wheel-drive
vehicle with all four wheels on the
ground, or even with only two of
its wheels on the ground, will
damage drivetrain components.
Do not tow an all-wheel-d ...
Making a Call
Radio with CD
1. Press the PHONE button twice.
2. Enter the character sequence.
See “Entering a Character Sequence” in Operation for more information.
3. Select Call to start dialing the numbe ...
Battery Replacement
To change the batteries:
1. Loosen the screw to the battery door located on the left side of the
headphones.
2. Slide the battery door open.
3. Replace the two AAA batteries.
4. Replace the bat ...