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:
Vehicle Speed Messages
SPEED LIMITED TO XXX MPH (KM/H)
This message displays when your vehicle speed is limited to 128 km/h (80 mph) because the vehicle detects a problem in the speed variable assist steering system.
Have ...
Starting the Vehicle
With this feature the engine can be started from outside of the vehicle.
1. Aim the RKE transmitter at the vehicle.
2. Press and release
.
3. Immediately after completing Step 2, press and hold
...
Safety Locks
The vehicle has rear door security locks to prevent passengers from opening the rear doors from the inside.
Open the rear doors to access the security locks on the inside edge of each door.
To set ...