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, press
, and an Advisor can run a check.
Connections
OnStar Additional InformationTransmission
Driver Shift Control (DSC) allows the automatic transmission to be shifted similar
to a manual transmission.
Electronic Range Select (ERS) allows for the selection of a range of gears.
Up-Shift Light
If the vehicle has a manual transmission, it will have an up-shift light that
indicates whe ...
Engine Overheating
There is an engine coolant temperature gauge on the vehicle instrument cluster
to warn of engine overheating.
If the decision is made not to lift the hood when this warning appears, get service
help right away.
If the decision is made to lift the hood, make sure the vehicle is parked on
a le ...
SIR Disabling and Enabling
SIR component location affects how a vehicle should be serviced. There are
parts of the SIR system installed in various locations around a
vehicle. To find the location of the SIR components refer to SIR Identification
Views.
There are several reasons for disabling the SIR system, such as re ...