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Maybe the problem lies in the switch that operates the "brake" light when the parking brake is applied. The DRL do not light up until the parking brake is released. I know that if my parking brake pedal is down so much as one "click" of the ratchet mechanism, the DRL do not illuminate.

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Q: What can cause the day time rinning lights on a 1997 Chevy Tahoe not to work when you have already changed the module and relay and the fuses are good and what can you do to fix it?
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