CAN COMMUNICATION SYSTEM Main Body ECU Communication Stop Mode

DTC Code DTC Name
Main Body ECU Communication Stop Mode

DESCRIPTION

Detection Item

Symptom

Trouble Area

Main Body ECU Communication Stop Mode

Either condition is met:

  • "Main Body" is not displayed on "CAN Bus Check".

  • "Main Body ECU Communication Stop Mode" in "DTC Combination Table" applies.

  • Power source or inside main body ECU (multiplex network body ECU)

  • Main body ECU (multiplex network body ECU) branch wire or connector

  • Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

C263739E01

CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tip:

Operating the engine switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE

  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note:

      • After turning the engine switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work.

        Click here

      • When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

        Click here

      Result

      Result

      NEXT
    NEXT

  2. CHECK FOR OPEN IN CAN BUS WIRE (MAIN BODY ECU BRANCH WIRE)

    1. C212975C01

      *a

      Rear view of wire harness connector

      (to Main Body ECU [Multiplex Network Body ECU])

      Disconnect the G47 main body ECU (multiplex network body ECU) connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Switch Condition

      Specified Condition

      G47-14 (CANH) - G47-13 (CANL)

      Engine switch off

      54 to 69 Ω

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE MAIN BODY ECU BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND)

    1. Connect the cable to the negative (-) battery terminal.

      Note:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

      Click here

      C215398C03

      *a

      Rear view of wire harness connector

      (to Main Body ECU [Multiplex Network Body ECU])

      *b

      Front view of wire harness connector

      (to Main Body ECU [Multiplex Network Body ECU])

    2. Remove the main body ECU (multiplex network body ECU).

      Click hereClick here

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G46-3 (GND2) - Body ground

      Always

      Below 1 Ω

      A-11 (GND1) - Body ground

      Always

      Below 1 Ω

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A-29 (ACC) - Body ground

      Engine switch on (ACC)

      11 to 14 V

      A-30 (BECU) - Body ground

      Always

      11 to 14 V

      A-31 (ALTB) - Body ground

      Always

      11 to 14 V

      A-32 (IG) - Body ground

      Engine switch on (IG)

      11 to 14 V

      Result

      Result

      OK

      NG
    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Click hereClick here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR