For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

California Proposition 65 WarningRear Seats
The vehicle's rear seats have adjustable head restraints in the outboard seating
positions.
The height of the head restraint can be adjusted. Pull the head restraint up
to raise it. Try to move the head restraint to make sure that it is locked in place.
To lower the head restraint, press ...
OnStar Description and Operation
This OnStar® system consists of the following components:
Telematics communication interface control module
OnStar® three button assembly
Microphone
Cellular antenna
Navigation antenna
Bluetooth® antenna (If equipped)
Back up battery (If equipped)
This system also interfaces wi ...
Electrical Power Management Description and Operation
Electrical Power Management
The electrical power management is used to monitor and control the charging
system and alert the driver of possible problems within the charging system.
The electrical power management system makes the most efficient use of the generator
output, improves ...