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:
Adjusting the Equalizer (EQ)
If the radio has this feature, the EQ
can be adjusted between talk and
manual.
To choose an EQ setting:
1. Press the TUNE/TONE knob.
2. Select EQ.
3. Select Talk or Manual.
4. Press the Back ...
Lumbar Adjustment
If available, hold the control on the
outboard side of the seat forward or
rearward to increase or decrease
the lumbar support on the driver or
front passenger seat.
A. Side Bolster Adjus ...
Power Liftgate Operation
WARNING!
Exhaust gases can enter the
vehicle if it is driven with the
liftgate or trunk/hatch open,
or with any objects that pass
through the seal between the
body and the trunk/hatch or
...