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

Either condition is met:


  • Communication stop for "Main Body" is indicated on the "Communication Bus Check" screen of the GTS Click here.

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

  • Main body ECU (multiplex network body ECU) branch line 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)

WIRING DIAGRAM

B005YN2E03

CAUTION / NOTICE / HINT

Note


  • Before measuring the resistance of the CAN bus, turn the power 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 (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

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

  • 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 Click here.

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

  • DTC check procedure: Turn the power switch on (IG) and wait at least 20 seconds.

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

  • 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 LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) BRANCH LINE)


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

    2. Disconnect the L201 main body ECU (multiplex network body ECU) connector.

    3. B005ZF5E03
      Text in Illustration
      *a

      Front view of wire harness connector

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L201-14 (CANH) - L201-13 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


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

    2. B005YSYE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

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

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

      Tech Tips

      Perform this inspection with the wire harness connected to the instrument panel junction block assembly.

    3. Reconnect the cable to the negative (-) auxiliary battery terminal.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      MB-30 (BECU) - Body ground Power switch off 11 to 14 V
      MB-29 (ACC) - Body ground Power switch on (ACC) 11 to 14 V
      MB-32 (IG) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Result Proceed to
      OK A
      NG (BECU) B
      NG (ACC) C
      NG (IG) D
      NG (GND1) E

    A

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

    C

    GO TO LIGHTING (INT) SYSTEM (ACC SIGNAL CIRCUIT) Click here

    D

    GO TO LIGHTING (INT) SYSTEM (IG SIGNAL CIRCUIT) Click here

    E

    CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT) Click here

    B

  3. CHECK HARNESS AND CONNECTOR (BECU SIGNAL CIRCUIT)


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

    2. Disconnect the 2C instrument panel junction block assembly connector.

    3. Reconnect the cable to the negative (-) auxiliary battery terminal.

    4. B005Z0TE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2C-18 - Body ground Power switch off 11 to 14 V

    OK

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BECU SIGNAL CIRCUIT)

  4. CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)


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

    2. Disconnect the 2B instrument panel junction block assembly connector.

    3. B005XS3E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2B-4 - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      2B-6 - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω

    OK

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)