OnStar Services

See also:

How to Detect a Tamper Condition
If  is pressed and the horn sounds, an attempted break-in occurred while the system was armed. If the alarm has been activated, a message will appear on the DIC. See Anti-theft Alarm ...

Engine Coolant Temperature Warning Light
For eAssist vehicles, this light comes on briefly while starting the vehicle. If it does not, have the vehicle serviced by the dealer. If the system is working normally, the indicator lig ...

Seating & Cargo
The standard eight-way power driver's seat offers plenty of adjustment range, so spouses of wide-ranging sizes should have no trouble finding their fit. If you're much taller than 6 feet, avoid th ...