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.
Chevrolet Q&AAsk Your Question
2008 Chevrolet Impala Question: what is the plug for at the bottom of the h.lamp wiring harness under the rad?
Answer #1Greg's Orange Auto (13933 Answers) , Orange, CA - (714) 361-9386globalhelper September 17, 2013, 12:50Master
Answer #2ChevyASE September 18, 2013, 00:46Journeyman
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.