CAN COMMUNICATION SYSTEM(for RHD) 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 "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)

WIRING DIAGRAM

A000USIE05

CAUTION / NOTICE / HINT

Note

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

Tech Tips

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

PROCEDURE


  1. 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.


    NEXT

  2. 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.


    NEXT

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


    1. A000W85E01
      Text in Illustration
      *a

      Front view of wire harness connector

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

      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

    NG

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

    OK

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


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

      A000Z7KE01
      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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. 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

    OK

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR