Welcome to the thread. I have found the following information on page 5-4 of your owner's manual:
"The dome lamp, cargo lamp and foot lamp inside the vehicle come on when any door is opened, if the dome lamp is in the door position. In addition, these lamps come on when the Remote Keyless Entry (RKE) unlock button is pressed. They stay on for 20 seconds or until a door is opened. After the door is opened and then closed, the light remains on for 20 seconds, or until the ignition is turned to ON/RUN."
This leads me to believe that the lights will shut off after 20 seconds when the door is closed. I am not sure when it is on. I would have to recommend contacting your local dealer for more information. I can also see if I can find more information with the last eight of your VIN. Contact me privately for more assistance. Thank you.
Tricia, GMC Customer Service.
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