The obvious appeal of the Axxess ASWC, for Prius owners, is that it automatically programs itself. The obvious drawback, for Prius owners, is that the installation instructions are wrong. An earlier thread suggested a corrected wiring scheme, but I was unable to get the ASWC working with this one. The ASWC's Application Chart notes that the Gen II Prius has an 8215 Shell connector for the steering wheel controls; this is correct. What's not correct is the wires it's supposed to include, and their positions on the connector: the three relevant wires are supposed to be blue (ground), black (connects to the ASWC #4 wire, green w/orange tripe), and red (connects to the ASWC #8 wire, black w/green stripe), at positions 6, 7, and 8, respectively. Not only are there no wires at those positions, but there are no wires with the colors in question on the connector (which has only a handful of wires), at least on my '07 Prius Base. The three relevant wires are in fact white, black, and red,* which connect with (respectively) the black, white, and tan wires on the harness included in the Scosche TA3103B adapter kit (note the potentially confusing fact that the black wire becomes white, while the white wire becomes black). An earlier poster suggested connecting the AWSC #4 wire (green/orange) to the TA3103B white wire (connects to the factory black wire), and connecting the ASWC #8 wire (black/green) to the TA3103B black write (connects to the factory white wire). I couldn't get this to work. I did discover later that my ground connection for the ASWC was a little shaky, but even when it was working, I could only get some of the steering wheel control functions to work. Looking again at the 8215 Shell connector, it's apparent that, if you count the wires the wrong way (at least, a different way from the way specified at the back of the Application Chart), the white wire is at position 6, the black one at 7, and the red one at 8. What I did was to connect the TA3103B black wire (connects to the factory white/"#6") to ground (I'm not sure connecting this one is necessary, but it certainly doesn't hurt anything), connect the TA3103 white wire (connects to the factory black/"#7") to the ASWC #4 (green/orange), and connect the TA3103 brown or tan wire (unhelpfully labeled "Mute"; connects to the factory red/"#8") to the ASWC #8 (black/green) wire. That worked. To summarize: Ground (possibly unnecessary) --> TA3103B black --> factory white ASWC #4 (green/orange) --> TA3103B white --> factory black AWSC #8 (black/green) --> TA3103B brown (or tan) --> factory red How did the earlier poster get his ASWC to work using seemingly different wires? It's possible that different model years within Gen II have different wire colors; the earlier poster's statement that the (factory) black wire is in position #8 supports that, because it's not in that position on my car, but rather at #7 (using the incorrect ordering I use above), but both he and I connected the #8 (black/green) ASWC wire to the wire in the #8 position in the harness (however, he also said that this black wire was connected to the TA3103B white wire, which shouldn't be in the #8 position). My suggestion is to pay attention to the ordering of the wires, and to experiment if the first arrangement you try doesn't work. By the way, I discovered that a nifty place to stash the ASWC is under the vent behind the passenger-side middle vent cover--that way, if something goes wrong with it, you only have to remove one piece to get to it. That space might also be good for mounting other equipment, such as an Aux or USB jack or a 12v outlet. * I think this one is red, but I wouldn't swear to that, and I'm not going to pull out the stereo again to check. If you start wiring and discover it's some other color (it's the one right next to the white and black wires), substitute that color for "red" in these instructions.