PAC SWI-CAN Steering Wheel CAN Databus Interface for use with SWI-X, SWI-ALP, SWI-PS or SWI-ECL Can Bus Steering Wheel Control Add On Module For Chrysler, Audi, Vw And Mercedes Benz. To Be Used With A Steering Wheel Control Module Retains onstar Retains door chime Add-on module for use with SWI-X, SWI-PS, SWI-JACK, and SWI-ECL2 Used when the factory steering wheel controls utilize the dual wire CAN Bus to control the factory radio Interprets the CAN Data to a usable signal that the other SWI-modules can use Connects to C2R-CHY or C2R-CHYNA for an easy all in on radio replacement