Maestro HRN-RR-TO1 Plug and Play T-Harness for TO1 Toyota Vehicles Connect a new car stereo and retain steering wheel controls and factory amp in select Toyota-made vehicles Allows installation of a new car stereo in select Toyota vehicles (also requires the Maestro ADS-MRR module) Retains the use of your steering wheel audio controls and factory amp Retains select factory features and displays performance data on touchscreen with select Alpine, JVC, Kenwood and Pioneer receivers