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 
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Advisor can run a check.
See also:
Chassis refinements
Chassis tuning has focused on achieving a smooth, quiet, refined ride. The
DTS features an all-new front cradle design, with the engine mounted to the
cradle, and the cradle mounted to the body ra ...
Auto Door Unlock
This feature allows you to select
whether or not the door(s) will
automatically unlock. It also allows
you to select which doors and when
they will automatically unlock.
See Automatic Door Lo ...
Total Weight on the
Vehicle's Tires
Inflate the vehicle's tires to the
upper limit for cold tires. These
numbers can be found on the
Certification label or see Vehicle
Load Limits. Do not
go over the GVW limit for the
vehicl ...