Vehicle and Power Issues
OnStar services require a vehicle electrical system, wireless service, and GPS satellite technologies to be available and operating for features to function properly. These systems may not operate if the battery is discharged or disconnected.
See also:
Fuel Gage
When the ignition is on, the fuel gage tells you
about how much fuel you have remaining.
Here are four things that some owners ask about.
None of these show a problem with your fuel gage:
...
XM™ Satellite Radio Service
For vehicles equipped with the
MyLink or IntelliLink infotainment
system, see the separate MyLink/IntelliLink Features and Functions
Guide for more information.
Vehicles with an XM satellite ra ...
Reading Lamps
The reading lamps are located in the headliner.
(Reading Lamps): Press the button
near each lamp to turn it on or off. ...