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Home >> Lexus >> 2017 >> RX 450h Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Can Communication System (Diagnostics - Circuit Tests) (1 Of 2) >> Can Communication System >> Open in Bus 2 Main Bus Line [10/2015 - 12/2017] >> Procedure

Open in Bus 2 Main Bus Line [10/2015 - 12/2017]: Procedure

  1. CHECK FOR OPEN IN CAN BUS LINES (NETWORK GATEWAY ECU) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the J75 network gateway ECU connector.
      GTY616354Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Network Gateway ECU)
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      J75-18 (CA4H) - J75-17 (CA4L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE NETWORK GATEWAY ECU. Refer to  REMOVAL [10/2015 - 08/2016]  , or refer to  REMOVAL [08/2016 - 08/2019] 

    Result: 

    NG 

    See step  2

  2. CHECK FOR OPEN IN CAN BUS LINES (ECM ASSEMBLY) 
    1. Reconnect the J75 network gateway ECU connector.
    2. Disconnect the A37 ECM assembly connector.
      GTY631798Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to ECM Assembly)
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A37-13 (CANH) - A37-26 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE ECM ASSEMBLY. Refer to  REMOVAL [10/2015 - 08/2016]  , or refer to  REMOVAL [08/2016 - 03/2018] 

    Result: 

    NG 

    See step  3

  3. CHECK FOR OPEN IN CAN BUS LINES (NO. 4 CAN JUNCTION CONNECTOR) 
    1. Reconnect the A37 ECM assembly connector.
    2. Disconnect the J96 No. 4 CAN junction connector.
      GTY635332Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 4 CAN Junction Connector)
      *b to ECM Assembly
      *c to Network Gateway ECU
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      J96-10 (CANH) - J96-21 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω ECM assembly
      J96-11 (CANH) - J96-22 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Network gateway ECU

      Result

      Result Proceed to
      OK A
      NG (ECM assembly main lines) B
      NG (Network gateway ECU main lines) C

    Result: 

    A 

    REPLACE NO. 4 CAN JUNCTION CONNECTOR 

    Result: 

    B 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (ECM ASSEMBLY - NO. 4 CAN JUNCTION CONNECTOR) 

    Result: 

    C 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NETWORK GATEWAY ECU - NO. 4 CAN JUNCTION CONNECTOR) 

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