Kwikee Bus Electric Step Control Unit Kit. 9506. Replacement kit for control unit 909506000. This kit includes Control Unit Harnesses 2 Styles of Magnetic Door Switches Control Unit for pre-IMGL/9510 Control steps with 5323 and 5327 switches . Will not work on steps made before 1999. Cargo door electric step control module. Used by Krystal and other bus builders.New Part/ Old stock. contains the module pictured. Limited supply. These modules are no longer available. For a current Kwikee step control module, please see next listing.