OnStar Vehicle Diagnostics can perform a vehicle check every month. It will check
the engine, transmission, antilock brakes, and other major vehicle systems. It also
checks the tire pressures, if the vehicle is equipped with the Tire Pressure Monitoring
System. If an On-Demand Diagnostics check is needed, press
, and an Advisor can run a check.
Connections
OnStar Additional InformationIgnition Positions
The ignition switch has four different positions.
The uplevel key must be fully extended to start the vehicle.
To shift out of P (Park), the ignition must be in ON/RUN and the regular brake
pedal applied.
1 (STOPPING THE ENGINE/LOCK/ OFF): When the vehicle is stopped, turn the ignition
sw ...
Loss of Control
Skidding
There are three types of skids that correspond to the vehicle's three control
systems:
Braking Skid - wheels are not rolling.
Steering or Cornering Skid - too much speed or steering in a curve causes
tires to slip and lose cornering force.
Acceleration Skid - too much thro ...
Immobilizer Operation
This vehicle has a passive theft-deterrent system.
The system does not have to be manually armed or disarmed.
The vehicle is automatically immobilized when the key is removed from the ignition.
The system is automatically disarmed when the vehicle is started with the correct
key. The key uses a ...