See also:

Checking Brake Fluid
Check brake fluid by looking at the brake fluid reservoir. See Engine Compartment Overview  . The fluid level should be above MIN. If it is not, have the brake hydraulic system checked to ...

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 v ...

Muting a Call
To Mute a Call Turn or press the MENU/SELECT knob and select Mute Call. To Cancel Mute Turn or press the MENU/SELECT knob and select Mute Call. ...