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 Window Wiper/ Washer
If equipped with the rear wiper/ washer, the controls are on the end of the windshield
wiper lever.
ON: Press the upper portion of the button for continuous rear window wipes.
OFF: The rear wiper turns off when the button is returned to the middle position.
INT (Intermittent Rear Wipes): Pres ...
Fuel Gauge
The fuel gauge indicates about how much fuel is left when the ignition is turned
to ON/RUN.
When the tank nears empty, the low fuel warning light will come on. There is
still a little fuel left, but the vehicle's fuel tank should be filled soon. See
Low Fuel Warning Light for more ...
Inspection/Maintenance Complete System Set Procedure
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an
overview of the diagnostic approach.
Diagnostic Procedure Instructions provides
an overview of each diagnostic cat ...