Body and Frame: Description and Operation

MULTIPLEX COMMUNICATION SYSTEM
THE SYSTEM IS COMPRISED OF THE COMMUNICATION NODES OF THE BODY ECU. DRIVER DOOR ECU. FRONT PASSENGER ODOR ECU AND TILT AND TELESCOPIC ECU (WI MEMORY). THE BODY ELECTRICAL SYSTEMS ARE CONTROLLED BY A SERIAL COMMUNICATION IN WHICH EACH ECU IS LINKED TO ANOTHER VIA A SINGLE COMMUNICATION LINE. THIS SYSTEM IS ALSO EQUIPPED WITH A SELF-DIAGNOSIS FUNCTION.

THE TABLE BELOW SHOWS THE SYSTEMS UNDER THE CONTROL OF THE MPX COMMUNICATION SYSTEM AND RELATED ECUS (COMMUNICATION NODES).






1. COMMUNICATION OUTLINE
COMMUNICATION IS IMPLEMENTED ALONG THE BODY. DRIVER DOOR. FRONT PASSENGER DOOR. TILT AND TELESCOPIC ECUS. UPON RECEIVING SIGNALS FROM APPLICABLE SWITCHES SUCH AS THE DOOR LOCK CONTROL SWITCH OR DOOR COURTESY LIGHT SWITCH. EACH ECU DETERMINES THE CONDITIONS OF THE SWITCHES AS WELL AS OF THE DOORS. AND AFTER CONVERTING THIS INFORMATION INTO DIGITAL SIGNALS. OUTPUTS THEN TO OTHER ECUS VIA SERIAL DATA COMMUNICATION. THE ECU THAT RECEIVES THESE DIGITAL SIGNALS THUS DETERMINES THE CONDITIONS OF THE SWITCHES AND DOORS SO THAT IT CAN IMPLEMENT VARIOUS CONTROLS SUCH AS TO ACTIVATE A DOOR LOCK MOTOR. HOWEVER. IF THERE ARE NO CHANGES IN THE INPUT SIGNALS BECAUSE NO DOORS WERE OPENED AND NO SWITCHES WERE USED WITHIN 30 SECONDS. THE BODY ECU INTERRUPTS THE COMMUNICATION TO SAVE ELECTRICITY. FOLLOWING THIS INTERRUPTION. ANY CHANGES IN THE INPUT SIGNALS WILL CAUSE THE COMMUNICATION TO RESUME. FOR DETAILS PLEASE REFER TO THE NEW CAR FEATURES AND REPAIR MANUALS.