Audio Lab STE-002 Steering Wheel Control OE Harness Adapter for Toyota 20 Pin (Female)
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When replacing your head unit, there may be cases when you encounter a separate steering wheel control socket. Typically you would need to splice into these to be able to connect the 2 or 3 wire connectors from the vehicles OE harness. This SWC harness will allow for wiring to be made so that you can just plug in direct to the OE steering wheel control harness without having to make any cutting or splicing to the original harness, and at the same time make connecting and removal a breeze.

Nevertheless, some knowledge of wiring is needed to identify the correct wire connection. Some aftermarket head unit manufacturers provide diagrams for this purpose.