#1. Standard Wire Harness This wire harness is compatible with standard wiring only. Will not work on models with Factory Infinity Systems, Boston Acoustic Systems or CAN Bus Radios (models REF, REC, RAQ or RAK; The radio's name can be found on the face of the radio). #2. Premium Wire Harness Module This wiring harness allows models with Factory Amplified Systems or CAN Bus Factory Radios REF, REC, RAQ and RAK (names can be found of front of radio) to replace Factory Radios while retaining all necessary safety and warning features #3. Premium Wire Harness Module w/ Steering Wheel Control This wiring harness allows models with Factory Amplified Systems or CAN Bus Factory Radios REF, REC, RAQ and RAK (names can be found of front of radio) to replace Factory Radios while retaining all necessary safety and warning features. This harness also allows you to keep your factory steering wheel controls and use them with your aftermarket radio.