A lot of elusive stereo info out there about our beloved es300s', Only info i have found mainly is to get a "Metra" wire harness that is for Toyota 1987-up. It's about $17.00 at Best buy. Just don't rely on the installers there too much for help. The guy at the front desk called the install bay and the installer didn't even know! Doh! hope this helps, I haven't changed my head unit out yet but plan to in a month or 2. Any one with better info please let us know!