CAN COMMUNICATION SYSTEM Open in Bus 5 Main Bus Line

DESCRIPTION

There may be an open circuit in one of the CAN main bus lines when the resistance between terminals 15 (CA5H) and 16 (CA5L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher.

Symptom Trouble Area
Resistance between terminals 15 (CA5H) and 16 (CA5L) of central gateway ECU (network gateway ECU) is 70 Ω or higher.

  • CAN main bus line or connector

  • Central gateway ECU (network gateway ECU)

  • No. 2 CAN junction terminal

  • No. 9 CAN junction connector

  • No. 10 CAN junction connector

  • No. 11 CAN junction connector or No. 13 CAN junction connector

This malfunction is not related to the lines of a CAN branch or to ECUs or sensors connected to a CAN branch.

WIRING DIAGRAM

Figure 1. w/ No. 11 CAN Junction Connector

B003TS6E02

Figure 2. w/ No. 13 CAN Junction Connector

B003V5JE04

CAUTION / NOTICE / HINT

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.

    Click here

  • Before measuring the resistance of the CAN bus, turn the engine 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 engine 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.

    Click here

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

    DTC check procedure: Turn the engine switch on (IG) and wait at least 20 seconds, turn the lane departure alert system on using the LDA main switch, turn the dynamic radar cruise control system on using the cruise control main switch, and then drive the vehicle at a speed of 40 km/h (25 mph) or more for 52 seconds 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.

    Click here

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 VEHICLE TYPE


    1. Check vehicle type.

      Result
      Result Proceed to
      for LHD A
      for RHD B

    B

    CHECK FOR OPEN IN CAN BUS LINES (NO. 10 CAN JUNCTION CONNECTOR) Click here

    A

  2. CHECK FOR OPEN IN CAN BUS LINES (NO. 10 CAN JUNCTION CONNECTOR)


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

    2. Disconnect the K146 and K151 No. 10 CAN junction connectors.

      B003V6JC01
      *a

      Rear view of wire harness connector

      (to No. 10 CAN Junction Connector)

      		 *b to No. 9 CAN Junction Connector
      *c to No. 11 CAN Junction Connector or No. 13 CAN Junction Connector - -
      Wiring Color:
      Code Color (CANH Side) Color (CANL Side) Connected to
      K146 LG B No. 9 CAN junction connector
      K151 BE B No. 11 CAN junction connector or No. 13 CAN junction connector

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      K146-1 (CANH) - K146-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 9 CAN junction connector
      K151-1 (CANH) - K151-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 11 CAN junction connector or No. 13 CAN junction connector
      Result
      Result Proceed to
      OK A
      NG (Line to No. 9 CAN junction connector) B
      NG (Line to No. 11 CAN junction connector or No. 13 CAN junction connector) C

    A

    REPLACE NO. 10 CAN JUNCTION CONNECTOR

    C

    GO TO STEP 8 Click here

    B

  3. CHECK FOR OPEN IN CAN BUS LINES (NO. 9 CAN JUNCTION CONNECTOR)


    1. Reconnect the K146 and K151 No. 10 CAN junction connectors.

    2. Disconnect the K142 and K143 No. 9 CAN junction connectors.

      B003TEYC02
      *a

      Rear view of wire harness connector

      (to No. 9 CAN Junction Connector)

      		 *b to Central Gateway ECU (Network Gateway ECU)
      *c to No. 10 CAN Junction Connector - -
      Wiring Color:
      Code Color (CANH Side) Color (CANL Side) Connected to
      K142 GR B Central gateway ECU (network gateway ECU)
      K143 LG B No. 10 CAN junction connector

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      K142-1 (CANH) - K142-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Central gateway ECU (network gateway ECU)
      K143-1 (CANH) - K143-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 10 CAN junction connector
      Result
      Result Proceed to
      OK A
      NG (Line to central gateway ECU (network gateway ECU)) B
      NG (Line to No. 10 CAN junction connector) C

    A

    REPLACE NO. 9 CAN JUNCTION CONNECTOR

    C

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 9 CAN JUNCTION CONNECTOR - NO. 10 CAN JUNCTION CONNECTOR)

    B

  4. CHECK FOR OPEN IN CAN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))


    1. Reconnect the K142 and K143 No. 9 CAN junction connectors.

    2. B003VK4C24
      *a

      Front view of wire harness connector

      (to Central Gateway ECU (Network Gateway ECU))

      Disconnect the K141 central gateway ECU (network gateway ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K141-15 (CA5H) - K141-16 (CA5L) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) Click here

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 9 CAN JUNCTION CONNECTOR)

  5. CHECK FOR OPEN IN CAN BUS LINES (NO. 10 CAN JUNCTION CONNECTOR)


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

    2. Disconnect the K146 and K151 No. 10 CAN junction connectors.

      B003TVRC01
      *a

      Rear view of wire harness connector

      (to No. 10 CAN Junction Connector)

      		 *b to No. 9 CAN Junction Connector
      *c to No. 11 CAN Junction Connector or No. 13 CAN Junction Connector - -
      Wiring Color:
      Code Color (CANH Side) Color (CANL Side) Connected to
      K146 LG B No. 9 CAN junction connector
      K151 BE B No. 11 CAN junction connector or No. 13 CAN junction connector

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      K146-1 (CANH) - K146-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 9 CAN junction connector
      K151-1 (CANH) - K151-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 11 CAN junction connector or No. 13 CAN junction connector
      Result
      Result Proceed to
      OK A
      NG (Line to No. 9 CAN junction connector) B
      NG (Line to No. 11 CAN junction connector or No. 13 CAN junction connector) C

    A

    REPLACE NO. 10 CAN JUNCTION CONNECTOR

    C

    CHECK VEHICLE TYPE Click here

    B

  6. CHECK FOR OPEN IN CAN BUS LINES (NO. 9 CAN JUNCTION CONNECTOR)


    1. Reconnect the K146 and K151 No. 10 CAN junction connectors.

    2. Disconnect the K142 and K143 No. 9 CAN junction connectors.

      B003UHWC01
      *a

      Rear view of wire harness connector

      (to No. 9 CAN Junction Connector)

      		 *b to Central Gateway ECU (Network Gateway ECU)
      *c to No. 10 CAN Junction Connector - -
      Wiring Color:
      Code Color (CANH Side) Color (CANL Side) Connected to
      K142 GR B Central gateway ECU (network gateway ECU)
      K143 LG B No. 10 CAN junction connector

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      K142-1 (CANH) - K142-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Central gateway ECU (network gateway ECU)
      K143-1 (CANH) - K143-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 10 CAN junction connector
      Result
      Result Proceed to
      OK A
      NG (Line to central gateway ECU (network gateway ECU)) B
      NG (Line to No. 10 CAN junction connector) C

    A

    REPLACE NO. 9 CAN JUNCTION CONNECTOR

    C

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 9 CAN JUNCTION CONNECTOR - NO. 10 CAN JUNCTION CONNECTOR)

    B

  7. CHECK FOR OPEN IN CAN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))


    1. Reconnect the K142 and K143 No. 9 CAN junction connectors.

    2. B003VK4C24
      *a

      Front view of wire harness connector

      (to Central Gateway ECU (Network Gateway ECU))

      Disconnect the K141 central gateway ECU (network gateway ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K141-15 (CA5H) - K141-16 (CA5L) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) Click here

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 9 CAN JUNCTION CONNECTOR)

  8. CHECK VEHICLE TYPE


    1. Reconnect the K146 and K151 No. 10 CAN junction connectors.

    2. Check whether the No. 11 CAN junction connector or No. 13 CAN junction connector is installed to the vehicle.

      Click here

      B003WFWC02
      *a

      Component with harness connected

      (No. 11 CAN Junction Connector)

      		 *b

      Front view of wire harness connector

      (to No. 13 CAN Junction Connector)
      Result
      Result Proceed to
      w/ No. 11 CAN Junction Connector A
      w/ No. 13 CAN Junction Connector B

    B

    CHECK FOR OPEN IN CAN BUS LINES (NO. 13 CAN JUNCTION CONNECTOR) Click here

    A

  9. CHECK FOR OPEN IN CAN BUS LINES (NO. 11 CAN JUNCTION CONNECTOR)


    1. Disconnect the Q62 and Q63 No. 11 CAN junction connectors.

      B003TEYC03
      *a

      Rear view of wire harness connector

      (to No. 11 CAN Junction Connector)

      		 *b to No. 10 CAN Junction Connector
      *c to No. 2 CAN Junction Terminal - -
      Wiring Color:
      Code Color (CANH Side) Color (CANL Side) Connected to
      Q62 BE B No. 10 CAN junction connector
      Q63 GR B No. 2 CAN junction terminal

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      Q62-1 (CANH) - Q62-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 10 CAN junction connector
      Q63-1 (CANH) - Q63-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction terminal
      Result
      Result Proceed to
      OK A
      NG (Line to No. 10 CAN junction connector) B
      NG (Line to No. 2 CAN junction terminal) C

    A

    REPLACE NO. 11 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 10 CAN JUNCTION CONNECTOR - NO. 11 CAN JUNCTION CONNECTOR)

    C

    GO TO STEP 11 Click here

  10. CHECK FOR OPEN IN CAN BUS LINES (NO. 13 CAN JUNCTION CONNECTOR)


    1. B003UMPC03
      *a

      Front view of wire harness connector

      (to No. 13 CAN Junction Connector)
      *b to No. 10 CAN Junction Connector
      *c to No. 2 CAN Junction Terminal

      Disconnect the Q68 No. 13 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      Q68-3 (CANH) - Q68-9 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 10 CAN junction connector
      Q68-4 (CANH) - Q68-10 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction terminal
      Result
      Result Proceed to
      OK A
      NG (Line to No. 10 CAN junction connector) B
      NG (Line to No. 2 CAN junction terminal) C

    A

    REPLACE NO. 13 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 10 CAN JUNCTION CONNECTOR - NO. 13 CAN JUNCTION CONNECTOR)

    C

  11. CHECK FOR OPEN IN CAN BUS LINES (NO. 2 CAN JUNCTION TERMINAL)


    1. Reconnect all wire harness connectors.

    2. Disconnect the K107 No. 2 CAN junction terminal connector.

    3. B003TLKC83
      *a

      Front view of wire harness connector

      (to No. 2 CAN Junction Terminal)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K107-3 (CANH) - K107-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (w/ No. 11 CAN Junction Connector) B
      NG (w/ No. 13 CAN Junction Connector) C

    A

    REPLACE NO. 2 CAN JUNCTION TERMINAL

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 2 CAN JUNCTION TERMINAL - NO. 11 CAN JUNCTION CONNECTOR)

    C

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 2 CAN JUNCTION TERMINAL - NO. 13 CAN JUNCTION CONNECTOR)