CAN COMMUNICATION SYSTEM(w/ Central Gateway ECU) Main Body ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Main Body ECU Communication Stop Mode

Any of the following conditions are met:


  • "Main Body" is indicated on the "Communication Bus Check" screen of the GTS.

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  • Communication system DTCs (DTCs that start with U) that are output correspond to "Main Body ECU Communication Stop Mode" in "DTC Combination Table"

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

  • Power source circuit of main body ECU (multiplex network body ECU)

  • Main body ECU (multiplex network body ECU) ground circuit

  • Main body ECU (multiplex network body ECU)

  • Driver side junction block assembly

WIRING DIAGRAM

B001HG0E01

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

Note


  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

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  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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  • Some parts must be initialized and set when replacing or removing and installing parts.

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  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

    DTC check procedure: Turn the ignition switch to ON and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

  • After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.

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

Tech Tips


  • Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.

  • When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE


  1. CHECK FOR OPEN IN CAN BUS WIRE (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] BRANCH WIRE)


    1. Disconnect the cable from the negative (-) battery terminal.

    2. B001D40C02
      *a

      Front view of wire harness connector

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

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G218-14 (CANH) - G218-13 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


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

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    2. Connect the driver side junction block assembly connectors.

    3. B001CBYC42
      *a

      Component without harness connected

      (Driver Side Junction Block Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-11 (GND1) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω

    4. Reconnect the cable to the negative (-) battery terminal.

      Note

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A-31 (BECU) - Body ground Always 11 to 14 V
      A-30 (ACC) - Body ground Ignition switch ACC 11 to 14 V
      Ignition switch off Below 1 V
      A-32 (IG) - Body ground Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. B001HQ0C01
      *a

      Front view of wire harness connector

      (to Driver Side Junction Block Assembly)

      Disconnect the driver side junction block assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2N-1 (GND1) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2K-1 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. B001F25C01
      *a

      Front view of wire harness connector

      (to Driver Side Junction Block Assembly)

      Disconnect the driver side junction block assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2M-23 - Body ground*1 Always 11 to 14 V
      2M-22 - Body ground*2 Always 11 to 14 V
      *1: w/o Door Control Battery
      *2: w/ Door Control Battery
      Result
      Result Proceed to
      OK A
      NG (w/o Door Control Battery) B
      NG (w/ Door Control Battery) C

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    C

    GO TO POWER DOOR LOCK CONTROL SYSTEM Click here

    A

  5. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. Disconnect the driver side junction block assembly connector.

      B001HEUC01
      *a

      Front view of wire harness connector

      (to Driver Side Junction Block Assembly)

      		 - -

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      2O-22 - Body ground Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      2O-23 - Body ground Ignition switch ACC 11 to 14 V
      Ignition switch off Below 1 V
      Result
      Result Proceed to
      OK A
      NG (w/o Entry and Start System) B
      NG (w/ Entry and Start System) C

    A

    REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY Click here

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    C

    GO TO ENTRY AND START SYSTEM Click here