Yea, you need a separate interface but the wires from the steering wheel buttons are in the same plug that goes into the factory radio. My point being that if you don't want to cut into the factory harness you'll need to add the 3 wires to the scosche harness and it's easy to rob the rear speaker wires since they are not used in the base Z. So factory plug to scosche harness (same as all the other radio wires) to SWI module to aftermarket radio SWI plug.
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