See also:

How to Check Automatic Transmission Fluid (3.9L Engine)
Because this operation can be a little difficult, you may choose to have this done at the dealer/retailer service department. If you do it yourself, be sure to follow all the instructions here, ...

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 ...

Passenger Sensing System
Your vehicle has a passenger sensing system for the right front passenger’s position. A passenger airbag status indicator in the rearview mirror will be visible when you turn your ignition key to ...