Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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I assume you are saying you are having trouble with your low beam lights. and daytime running lights. Since the daytime running lights use the BCM to control them and the low beam headlights use the switch and a fuse it helps determine the fault. SO lets start with using a test light and checking for power at the low beam headlight either side. If you have power they do share a common ground by the battery, which could be the cause.