This harness is used to install an aftermarket Stereo in your vehicle. You simply unplug your factory Audio, plug this adapter in to the car stereo harness and then install your NEW one. The idea of "aftermarket harnesses" is so you do not have to cut any wires, and most importantly you don't have to cut your CAR'S STEREO HARNESS. This part is guaranteed to fit all vehicles listed, please contact us with any questions. Compatible With Toyota: 1987 - 2005 4-Runner 1995 - 1999 Avalon 1987 - 2005 Camry 1987 - 2004 Celica 1987 - 2005 Corolla 1988 - 1993 Cressida 2000 - 2002 Echo 2001 - 2004 Highlander 1987 - 1996 Landcruiser 1987 - 2002 MR2 2004 - 2005 Prius 1996 - 2004 RAV4 2001 - 2004 Sequoia 1996 - 2004 Sienna 1995 - 2005 Tacoma 1999 - 2004 Tundra