it is the wiring harness that run from left to right headlamp under the radiator/condensor/fan. It is the plug in between the air bag sensor wires.
what is the plug for at the bottom of the h.lamp wiring harness under the rad? on 2008 Chevrolet Impala
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Maybe it is for your fog lamps (or what would be the fog lamps if that option isn't on the vehicle. Give me the last 8 of the vin and I can research it for you.