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:
Consistency of Readings
Always check the fluid level at least twice using the procedure described previously. Consistency (repeatable readings) is important to maintaining proper fluid level. If readings are still inconsiste ...
Brake System Messages
BRAKE FLUID LOW
This message is displayed when the brake fluid level is low; see Brake Fluid
on page 10‑24.
RELEASE PARKING BRAKE
This message is displayed as a reminder that the parking br ...
Sunroof
The ignition must be in ON/RUN or ACC/ACCESSORY to operate the sunroof and power sunshade.
See Retained Accessory Power (RAP) on page 9‑20.
The vehicle may have a sunroof over the front seats ...