Parental Control
The RSE system may have a Parental Control feature, depending on the radio. To enable Parental Control, press and hold the radio power button for more than two seconds to stop all system features such as: radio, video screen, RSA, DVD and/or CD.
While Parental Control is on, 
displays.
When the radio is turned back on, Parental Control is unlocked.
See also:
Power Liftgate Operation
On vehicles with a power liftgate, the vehicle must be in P (Park) to use the
power feature. The taillamps flash when the power liftgate moves.
Notice: If you open the liftgate without checking f ...
Remote Vehicle Start
The vehicle may have this feature that allows you to start the engine from outside
the vehicle.
(Remote Vehicle Start): This button
will be on the RKE transmitter if the vehicle has remote start. ...
How to Add Coolant to the Coolant Surge Tank for Gasoline Engines
If the vehicle has a diesel engine, see “Cooling System” in the Duramax Diesel Supplement for the proper coolant fill procedure.
WARNING
You can be burned if you spill coolant on hot engine part ...