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This may sound funny, but make sure the parking brake is completely released

AnswerThe daytime running lights have a fuse, relay, control module, and a diode. The last three are located under the left side of the instrument panel. They will all need to be checked.

You may also have a short or open in the DRL circuit. since the high beams are working and they are the same bulbs as the DRL's.

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Q: Any idea how to troubleshoot faulty daytime running lights on a 1999 Chevy Suburban 4x4 that has a good DRL fuse and dash light along with working low and high beams?
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