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:
Front Fog Lamp Light
For vehicles with fog lamps, this light comes on when the fog lamps are on.
The light goes out when the fog lamps are turned off. See Fog Lamps on page 6‑6 for more information. ...
Three-Way Calling
Three-way calling must be supported on the cell phone and enabled by the wireless service carrier.
1. While on a call, press .
2. Say “Three-way call.” 3. Use the dial or call command to dial th ...
Power Outlet 120 Volt Alternating Current
The vehicle may have a power outlet that can be used to plug in electrical equipment that uses a maximum limit of 150 watts.
The power outlet is located on the rear of the center console.
An indic ...