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Home >> Lexus >> 2018 >> LS 500 Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Can Communication System - Circuit Tests (4 Of 9) >> Can Communication System >> Open in Bus 1 Main Bus Line [12/2017 - 10/2020] >> Procedure

Open in Bus 1 Main Bus Line [12/2017 - 10/2020]: Procedure

  1. CHECK FOR OPEN IN CAN BUS WIRE (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU]) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the G66 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
      G66-18 (CA4H) - G66-17 (CA4L) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 7 CAN JUNCTION CONNECTOR) 

    Result: 

    OK 

    See step  2

  2. CHECK FOR OPEN IN CAN BUS WIRE (NO. 6 CAN JUNCTION CONNECTOR) 
    1. Reconnect the G66 central gateway ECU (network gateway ECU) connector.
    2. Disconnect the G125 No. 6 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
      G125-7 (CANH) - G125-1 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 16 CAN junction connector
      G125-10 (CANH) - G125-4 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 7 CAN junction connector

      Result

      Result Proceed to
      OK A
      NG (No. 16 CAN junction connector CAN main wire) B
      NG (No. 7 CAN junction connector CAN main wire) C

    Result: 

    A 

    REPLACE NO. 6 CAN JUNCTION CONNECTOR 

    Result: 

    C 

    See step  5

    Result: 

    B 

    See step  3

  3. CHECK FOR OPEN IN CAN BUS WIRE (NO. 16 CAN JUNCTION CONNECTOR) 
    1. Reconnect the G125 No. 6 CAN junction connector.
    2. Disconnect the L123 No. 16 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
      L123-1 (CANH) - L123-11 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 6 CAN junction connector
      L123-2 (CANH) - L123-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 3 CAN junction terminal

      Result

      Result Proceed to
      OK A
      NG (No. 3 CAN junction terminal CAN main wire) B
      NG (No. 6 CAN junction connector CAN main wire) C

    Result: 

    A 

    REPLACE NO. 16 CAN JUNCTION CONNECTOR 

    Result: 

    C 

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 16 CAN JUNCTION CONNECTOR - NO. 6 CAN JUNCTION CONNECTOR) 

    Result: 

    B 

    See step  4

  4. CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 CAN JUNCTION TERMINAL - NO. 16 CAN JUNCTION CONNECTOR) 
    1. Reconnect the L123 No. 16 CAN junction connector.
    2. Disconnect the L126 No. 3 CAN junction terminal connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L126-3 (CANH) - L126-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 3 CAN JUNCTION TERMINAL 

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 CAN JUNCTION TERMINAL - NO. 16 CAN JUNCTION CONNECTOR) 

  5. CHECK FOR OPEN IN CAN BUS WIRE (NO. 7 CAN JUNCTION CONNECTOR) 
    1. Reconnect the G125 No. 6 CAN junction connector.
    2. Disconnect the G126 No. 7 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
      G126-2 (CANH) - G126-8 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 9 CAN junction terminal
      G126-12 (CANH) - G126-6 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 6 CAN junction connector

      Result

      Result Proceed to
      OK A
      NG (No. 9 CAN junction terminal CAN main wire) B
      NG (No. 6 CAN junction connector CAN main wire) C

    Result: 

    A 

    REPLACE NO. 7 CAN JUNCTION CONNECTOR 

    Result: 

    C 

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 6 CAN JUNCTION CONNECTOR) 

    Result: 

    B 

    See step  6

  6. CHECK FOR OPEN IN CAN BUS WIRE (NO. 9 CAN JUNCTION TERMINAL - NO. 7 CAN JUNCTION CONNECTOR) 
    1. Reconnect the G126 No. 7 CAN junction connector.
    2. Disconnect the G127 No. 9 CAN junction terminal connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G127-3 (CANH) - G127-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 9 CAN JUNCTION TERMINAL 

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 9 CAN JUNCTION TERMINAL - NO. 7 CAN JUNCTION CONNECTOR) 

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