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:
Dome Lamp Override
The dome lamp override button is located next to the exterior lamps control.
: Press the button in and the dome lamps remain off when a door is opened. Press the button again to return it to th ...
Driving with a Trailer
Towing a trailer requires experience.
Get familiar with handling and braking with the added trailer weight. The vehicle is now longer and not as responsive as the vehicle is by itself.
Check all tra ...
Passenger Sensing System
The passenger sensing system, if equipped, turns off the front outboard passenger frontal airbag under certain conditions. No other airbag is affected by the passenger sensing system.
If the vehicle ...