MULTIPLEX COMMUNICATION


  1. GENERAL


    1. The Controller Area Network (CAN) is a serial data communication network for real time application. It is a multiplex communication network equipped in a vehicle, and has communication speeds of 500 kbps (HS-CAN) and 250 kbps (MS-CAN), and the ability to detect malfunctions.

    2. The HS-CAN consists of the V Bus and Movement Control Bus.*

      *: Models with movement control Bus

    3. The MS-CAN consists of the MS Bus.

    4. The network gateway ECU has a gateway function and is used to transmit data between the V bus and Movement Control Bus*.

      *: Models with network gateway ECU

    5. The main body ECU has a gateway function and is used to transmit data between the V Bus and MS Bus.

    6. The CAN has 2 terminating resistors which are necessary for accurate judgment of communication on the main bus.

    7. The communication wire used is a twisted-pair wire. The bus line has a high line (2.5 V to 3.5 V of voltage is applied) and a low line (1.5 V to 2.5 V of voltage is applied).

  2. SYSTEM DIAGRAM


    1. Models with Network Gateway ECU

      Figure 1. V Bus (LHD Models)

      A01W61LE01

      Figure 2. Movement Control Bus (LHD Models)

      A01W6ATE01

      Figure 3. MS Bus (LHD Models)

      A01W6RGE01

    2. Models without Network Gateway ECU

      Figure 4. V Bus (LHD Models)

      A01W6UUE01

      Figure 5. MS Bus (LHD Models)

      A01W686E01

  3. LAYOUT OF MAIN COMPONENTS

    A01W6BMC01
    *A Models with Tire Pressure Warning System *B Models with Power Back Door System
    *1 ECM *2

    Hydraulic Brake Booster Assembly


    • Skid Control ECU
    *3 Outer Mirror ECU *4 No. 1 Junction Connector
    *5 Suspension Control ECU *6 No. 9 Junction Connector
    *7 Tire Pressure Warning ECU and Receiver *8 Power Back Door ECU
    *9 No. 2 Main Body ECU - -
    A01W6Y7C01
    *A Models with VGRS System *B Models with Toyota Parking Assist-sensor System and Models without Side Monitor System
    *C Models with Parking Assist Monitor System *D Models with Rain Sensor
    *E Models with Navigation System *F Models with Entry and Start System
    *1 Combination Meter Assembly *2 Seat Belt Control ECU
    *3 No. 7 Junction Connector *4 No. 3 Junction Connector
    *5 Steering Control ECU *6 Main Body ECU (Driver Side Junction Block)
    *7 No. 8 Junction Connector *8 Multiplex Tilt and Telescopic ECU
    *9 DLC3 *10 Driver Seat ECU
    *11 Steering Sensor *12 Center Airbag Sensor Assembly
    *13 Yaw Rate Sensor Assembly *14 Air Conditioning Amplifier Assembly
    *15 No. 11 Junction Connector *16 Clearance Warning ECU
    *17 Parking Assist ECU *18 Windshield Wiper ECU
    *19 Network Gateway ECU *20 No. 4 Junction Connector
    *21 4WD Control ECU *22 No. 10 Junction Connector
    *23 No. 2 Junction Connector *24 No. 5 Junction Connector
    *25 Multi-media Module Receiver Assembly *26 Certification ECU
    *a Refer to the Service Bulletin for the installation of the part. - -

  4. DIAGNOSIS


    1. If a malfunction occurs on the CAN communication line, the ECU that is connected to the CAN communication line stores the DTC (Diagnostic Trouble Code) in its memory.

    2. For details, refer to the Repair Manual