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I have a 2015 Chevy express 12 passenger van LS. I am trying to install 7 pin conecter. I ran across this plug under rear drivers side bumper, what is it?
I second that. I believe it is the wiring harness for the Rear Object Sensors. It's a worthwhile option to have. I miss it. Mine is disconnected at the moment.
Yep that's exactly what it is. ^^^^^^^ Rear object detection (RPO UD7) is optional on your vehicle. Apparently yours is not equipped with rear object detection. So the connector is plugged.