When replacing your factory radio with an after-market car stereo, the FWH-592 wire harness is a must for a quick and clean installation. It eliminates cutting your OE radio plug. After connecting it, your install is simple as the wires will color-match and easily connect to the after-market stereo. Without the FWH-592, you would have to cut the OE radio plug and manually test each wire to connect to your after-market receiverFeatures