Today's modern vehicle audio systems are becoming increasingly more sophisticated and complex. PAC® Audio engineered this AmpPRO4 Interface to improve your vehicle's audio performance while keeping the original radio’s fit and finish. The AP4-TY11 simplifies the installation of upgraded amplifiers in select Toyota® and Lexus® vehicles with JBL® amplified systems. This amplifier integration interface also allows you to retain important factory features. Toyota® vehicles must be equipped with a JBL® system. Between 2012-2015, Toyota® used 2 different styles of connectors. In order for the AP4-TY11 to be compatible, the radio must have the 20-pin BHA8113 style connector. Vehicles equipped with the 10-/6-pin BHA1761 style connector are not compatible. The only way to know what connector the radio has is to physically remove it from the dash and look at it. Lexus® vehicles must be equipped with a center channel and a subwoofer. And vehicles with telematics (ie: SOS, Enform, etc.) will require some additional wiring. See manual for details..