I used this harshness to install an ATOTO SA102 main unit and ASWC-1 interface in my 2010 Subaru Legacy. At first I couldn't get the buttons on the steering wheel to work. I called Axxess support and they insisted I cut the factory wires. Instead, I contacted AutoHarnessHouse support. Brian asked me a series of questions about my setup and told me what to do. I really, really, really recommend this AutoHarnessHouse harness! My working configuration is below. 2010 Subaru Legacy 2.5i Premium (No OEM Navigation, Bluetooth and dedicated phone button) - long BLACK wire from 20-pin harness to BLACK and WHITE/GREEN wires on ASWC-1 harness - long RED wire from 20-pin harness to RED ASWC-1 Harness - Long GREEN wire of 20-pin harness to GRAY/RED ASWC-1 harness. For my purposes I used all the wires from the 20 pin harness except for the PINK VSS wire and the long BLUE wire which I was told is used for either a dedicated bluetooth button or for a SWC phone .