Re: DRL not working / All fuses, relays and bulbs good
The bulb holder in the DRL which is L shaped and connects into the harness is probably bad. I had one go bad on me. You can disconnect the holder from the harness via the quick disconnect and use a multimeter to see if you have continuity between the pin and the bulb holder contact. For some reason they break internally and you have to replace the holder.
And yes if you lose a bulb or lose connection in the DRL the cruise control will not work. Not sure why GM does that but all my Chevys lose Cruise control when a bulb is out.
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