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do you have buttons on steering wheel to get in and make personal changes? is there a read out down where your mileage is? I can go in and make changes to mine. Headlights, security lights, etc.
Check the little button next to the brightness dial. Should be on the Dash to the left of the steering column next to your headlight selection and rear wiper switch.
Open the door then press the button to see if the lights come on.
It's why we all come here
I'm just happy to hear it was something simple and not problem with the Tahoe.