Description of On-Board Diagnostics

Introduction to SWS Diagnosis
The SWS reduces the number of wires by sending multiple signals along a single wire. This reduces vehicle weight and simplifies construction by reducing wiring harness complexity weight. The ETACS-ECU, front-ECU and column switch (incorporated in column-ECU) have multiplex signal circuits that enable them to transmit and/or receive multiple signals and communicate with other control unit.