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 WarningRoof
Sunroof
On vehicles with this feature, the sunroof only operates when the ignition is
turned to ON/RUN or Retained Accessory Power (RAP) is active.
Open/Close: To open the sunroof, press and hold the rear of the switch. To close
the sunroof, press and hold the front of the switch.
Vent: Pre ...
Rear Side Door Weatherstrip Replacement - Door Side
Rear Side Door Weatherstrip Replacement - Door Side
Callout
Component Name
1
Rear Side Door Weatherstrip
Procedure
Open the front side door to the fully open position.
Remove the front side door check link bo ...
Synchronizers Cleaning and Inspection
Note: When servicing the synchronizers, retain them in the order
that they are removed. Mark the parts to ensure the correct position for
inspection and assembly.
Clean all the synchronizer parts in a suitable cleaning
solvent and air dry all the parts.
Inspect the 1 ...