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CAN COMMUNICATION SYSTEM (for RHD) Main Body ECU Communication Stop Mode

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DTC Code DTC Name
  Main Body ECU Communication Stop Mode
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DESCRIPTION

Detection Item Symptom Trouble Area
Main Body ECU Communication Stop Mode

Either condition is met:


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

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


  • Power source or inside of main body ECU (driver side junction block)

  • Main body ECU (driver side junction block) CAN branch wire or connector

  • Main body ECU (driver side junction block)

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

Tip:

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

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PROCEDURE


  1. Click here

    PRECAUTION

    Note:

    After turning the power switch off, waiting time may be required before disconnecting the cable from the auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the auxiliary battery terminal notice before proceeding with work (Click here).


  2. Click here

    DISCONNECT CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL


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

      CAUTION:

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

      Note:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Click here).


  3. Click here

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


    1. A01GXSAE01

      Disconnect the main body ECU (driver side junction block) connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      L11-5 (CANH) - L11-6 (CANL) Power switch off 54 to 69 Ω
      Table 1. Text in Illustration
      *a

      Front view of wire harness connector

      (to Main Body ECU [Driver Side Junction Block])


  4. Click here

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


    1. A01GWSFE02

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

      Table 2. Text in Illustration
      *a

      Front view of wire harness connector

      (to Main Body ECU [Driver Side Junction Block])

      - -
      Note:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Click here).

    2. Disconnect the main body ECU (driver side junction block) connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      DF-1 (ALTB) - Body ground Always 11 to 14 V
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      DA-40 (GND1) - Body ground Always Below 1 Ω
      DA-40 (GND2) - Body ground Always Below 1 Ω
      L11-1 (GND3) - DA-41 Always Below 1 Ω

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    CHECK HARNESS AND CONNECTOR (IG, ACC CIRCUIT)


    1. Disconnect the L13 main body ECU (driver side junction block) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L13-3 (IG1D) - DA-32 Always Below 1 Ω
      L13-22 (ACCD) - DA-19 Always Below 1 Ω
      L13-3 (IG1D) - Body ground Always 10 kΩ or higher
      L13-22 (ACCD) - Body ground Always 10 kΩ or higher

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

  7. Click here

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)

  8. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR