this is the wiring harness/interface for late model GM LAN based vehicles. it is the only correct way to put an aftermarket radios in the newer style (most '07 and up) GM vehicles. it was wired to an aftermarket radio harness, but the person who’s car is was for decided at the last minute they didn’t want to spend that much money. retails for $225. $100 obo.
bump. I have no use for this…