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:

Vehicle Care
California Proposition 65 WarningLighting
Specifications
Headlights/Daytime Running Lights (DRL) Schematics
Interior Lights Schematics
...
Using the Navigation System
Use the NAV button on the faceplate or Home Page to access the navigation map.
Press the NAV button again to change between alternative views of the normal
split and full map views.
The Menu screen button at the bottom right side of the display accesses the Navigation
Menu.
The touch-sens ...
Installation Procedure
Clean and prepare the attaching surfaces for welding.
Apply structural adhesive to the attaching flanges.
Position the body side outer lower panel on the vehicle
Verify the fit of the body side outer lower panel.
Clamp the body side outer lower panel into position.
Spot ...