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Due to fact that the GM OnStar system sends transmissions periodically to the vehicle we
suggest that the system should temporarily be disabled during the installation
and modification process.
If the OnStar system is not disabled during install and modification and the system should receive a
transmission in the middle of tune install or backup, the tool will be interrupted and the process will
have to be started over again.
To avoid this problem it is recommended that the system is disabled during tune install, backup and
modification.
To disable the OnStar system, please refer to your ownersí manual and locate the fuse(s) associated
with OnStar. The OnStar system is disabled when the OnStar light is turned off.
On some vehicles it is necessary to remove more than one fuse; this will be indicated by the OnStar
light still on after removal of fuse in the engine compartment fuse panel.
Vehicles equipped with the GM OnStar system
Vehicles equipped with the GM OnStar system
