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  • morin2 03/27/10 5:26 pm PST

    When I had a 2001 Silverado, I remember someone told me of a way to disable the DRLs. I didn't do it, but know some people who did. Its possible that the DRL and auto headlights are connected and that you accidentally performed the procedure that disabled them (it was not intuitive - had to do with turning the ignition key x number of times and headlight switch). Try a search for disabling the GM DRL (it was not in my owner's manual) and see if the instructions for restoring the function are there.

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