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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) (2 Of 2) >> Can Communication System >> Open in Bus 4 Main Bus Line [10/2015 - 08/2019] >> Procedure

Open in Bus 4 Main Bus Line [10/2015 - 08/2019]: 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.
      GTY673336Courtesy 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
      J75-22 (CA2H) - J75-7 (CA2L) 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 (AIRBAG SENSOR ASSEMBLY) 
    1. Reconnect the J75 network gateway ECU connector.
    2. Disconnect the J20 airbag sensor assembly connector.
      GTY662400Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Airbag Sensor Assembly)
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      J20-13 (CANH) - J20-22 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [10/2015 - 08/2016]  , or refer to  REMOVAL [08/2016 - 03/2018]  , or refer to  REMOVAL [03/2018 - 08/2019] 

    Result: 

    NG 

    See step  3

  3. CHECK FOR OPEN IN CAN BUS LINES (NO. 9 CAN JUNCTION CONNECTOR) 
    1. Reconnect the J20 airbag sensor assembly connector.
    2. Disconnect the R40 or R56 No. 9 CAN junction connector.
      GTY954803Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A w/o Rear No. 2 Seat
      *B w/ Rear No. 2 Seat
      *a Front view of wire harness connector
      (to No. 9 CAN Junction Connector)
      *b to No. 12 CAN Junction Connector
      *c to No. 8 CAN Junction Connector
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/O REAR NO. 2 SEAT

      Tester Connection Condition Specified Condition Connected to
      R40-9 (CANH) - R40-20 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 12 CAN junction connector
      R40-11 (CANH) - R40-22 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 8 CAN junction connector
      W/ REAR NO. 2 SEAT

      Tester Connection Condition Specified Condition Connected to
      R56-9 (CANH) - R56-20 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 12 CAN junction connector
      R56-11 (CANH) - R56-22 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 8 CAN junction connector

      Result

      Result Proceed to
      OK A
      NG (No. 8 CAN junction connector main lines) B
      NG (No. 12 CAN junction connector main lines) C

    Result: 

    A 

    REPLACE NO. 9 CAN JUNCTION CONNECTOR 

    Result: 

    C 

    See step  6

    Result: 

    B 

    See step  4

  4. CHECK FOR OPEN IN CAN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR) 
    1. Reconnect the R40 or R56 No. 9 CAN junction connector.
    2. Disconnect the A86 No. 1 CAN junction connector.
      GTY662738Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 1 CAN Junction Connector)
      *b to No. 8 CAN Junction Connector
      *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
      A86-8 (CANH) - A86-19 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 8 CAN junction connector
      A86-9 (CANH) - A86-20 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Network gateway ECU

      Result

      Result Proceed to
      OK A
      NG (Network gateway ECU main lines) B
      NG (No. 8 CAN junction connector main lines) C

    Result: 

    A 

    REPLACE NO. 1 CAN JUNCTION CONNECTOR 

    Result: 

    B 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NETWORK GATEWAY ECU - NO. 1 CAN JUNCTION CONNECTOR) 

    Result: 

    C 

    See step  5

  5. CHECK FOR OPEN IN CAN BUS LINES (NO. 8 CAN JUNCTION CONNECTOR) 
    1. Reconnect the A86 No. 1 CAN junction connector.
    2. Disconnect the R37 or R55 No. 8 CAN junction connector.
      GTY954802Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A w/o Rear No. 2 Seat
      *B w/ Rear No. 2 Seat
      *a Front view of wire harness connector
      (to No. 8 CAN Junction Connector)
      *b to No. 9 CAN Junction Connector
      *c to No. 1 CAN Junction Connector
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/O REAR NO. 2 SEAT

      Tester Connection Condition Specified Condition Connected to
      R37-1 (CANH) - R37-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 9 CAN junction connector
      R37-2 (CANH) - R37-13 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 1 CAN junction connector
      W/ REAR NO. 2 SEAT

      Tester Connection Condition Specified Condition Connected to
      R55-1 (CANH) - R55-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 9 CAN junction connector
      R55-2 (CANH) - R55-13 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 1 CAN junction connector

      Result

      Result Proceed to
      OK A
      NG (No. 1 CAN junction connector main lines) B
      NG (No. 9 CAN junction connector main lines) C

    Result: 

    A 

    REPLACE NO. 8 CAN JUNCTION CONNECTOR 

    Result: 

    B 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - NO. 8 CAN JUNCTION CONNECTOR) 

    Result: 

    C 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 8 CAN JUNCTION CONNECTOR - NO. 9 CAN JUNCTION CONNECTOR) 

  6. CHECK FOR OPEN IN CAN BUS LINES (NO. 12 CAN JUNCTION CONNECTOR) 
    1. Reconnect the R40 or R56 No. 9 CAN junction connector.
    2. Disconnect the S63 or S92 No. 12 CAN junction connector.
      GTY954788Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A w/o Rear No. 2 Seat
      *B w/ Rear No. 2 Seat
      *a Front view of wire harness connector
      (to No. 12 CAN Junction Connector)
      *b to No. 7 CAN Junction Connector
      *c to No. 9 CAN Junction Connector
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/O REAR NO. 2 SEAT

      Tester Connection Condition Specified Condition Connected to
      S63-1 (CANH) - S63-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 7 CAN junction connector
      S63-7 (CANH) - S63-18 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 9 CAN junction connector
      W/ REAR NO. 2 SEAT

      Tester Connection Condition Specified Condition Connected to
      S92-1 (CANH) - S92-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 7 CAN junction connector
      S92-7 (CANH) - S92-18 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 9 CAN junction connector

      Result

      Result Proceed to
      OK A
      NG (No. 7 CAN junction connector main lines) B
      NG (No. 9 CAN junction connector main lines) C

    Result: 

    A 

    REPLACE NO. 12 CAN JUNCTION CONNECTOR 

    Result: 

    C 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 9 CAN JUNCTION CONNECTOR - NO. 12 CAN JUNCTION CONNECTOR) 

    Result: 

    B 

    See step  7

  7. CHECK FOR OPEN IN CAN BUS LINES (NO. 7 CAN JUNCTION CONNECTOR) 
    1. Reconnect the S63 or S92 No. 12 CAN junction connector.
    2. Disconnect the J99 No. 7 CAN junction connector.
      GTY635864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 7 CAN Junction Connector)
      *b to Airbag Sensor Assembly
      *c to No. 12 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
      J99-1 (CANH) - J99-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Airbag sensor assembly
      J99-6 (CANH) - J99-17 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 12 CAN junction connector

      Result

      Result Proceed to
      OK A
      NG (Airbag sensor assembly main lines) B
      NG (No. 12 CAN junction connector main lines) C

    Result: 

    A 

    REPLACE NO. 7 CAN JUNCTION CONNECTOR 

    Result: 

    B 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (AIRBAG SENSOR ASSEMBLY - NO. 7 CAN JUNCTION CONNECTOR) 

    Result: 

    C 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 12 CAN JUNCTION CONNECTOR) 

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