This iDatalink HRN-DSP-TO1 harness connects a Rockford Fosgate  digital signal processor (sold separately) to your Lexus or Toyota with no factory amp, so you can add digital signal processing as well as an aftermarket amp without losing important features and functions. This T-harness connects to the factory radio’s harness, supplying audio and databus signals to the DSR1’s Maestro interface without any wire splicing.

This harness also provides connections to the factory speaker wiring, which you can conveniently use for your aftermarket amp’s outputs.

• T-harness to add Rockford Fosgate DSR1 processor to select 2005-up Scion, Subaru, and Toyota vehicles
• retain fader control, tone, and other important features and functions