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Where is the DRL module located on a 2000 Mustang?

The 2000 Mustang's Daytime Running Lights (DRL) aren't controlled by a separate, dedicated "DRL module." The DRL function is integrated into the Powertrain Control Module (PCM), also known as the Engine Control Module (ECM). There isn't a specific box labeled "DRL Module" to find. Any DRL issues will likely require diagnostics and potential programming changes via the PCM.