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:
Comfort and convenience
One of the XLR's foremost convenience features is Keyless Access. Keyless
Access makes XLR a truly "keyless" car. A driver can simply keep the fob in a
pocket or purse to operate the doo ...
Battery Load Management
The vehicle has Electric Power Management (EPM) that estimates the battery's
temperature and state of charge. It then adjusts the voltage for best performance
and extended life of the battery. ...
Power Liftgate Operation
On vehicles with a power liftgate, the switch is on the overhead console.
The vehicle must be in P (Park) to use the power feature. The taillamps will
flash and a chime will sound when the power li ...