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Home >> Lexus >> 2017 >> ES 350 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Can Communication System (W/ Central Gateway Ecu) (Diagnostics & Symptom Tests) >> CAN COMMUNICATION SYSTEM(w/ Central Gateway ECU) >> Open in Bus 1 Main Bus Line (07/2015 -) >> Procedure

Open in Bus 1 Main Bus Line (07/2015 -): Procedure

  1. CHECK FOR OPEN IN CAN BUS LINES (CENTRAL GATEWAY ECU) 
    1. Disconnect the H60 central gateway ECU connector.
      GTY660708Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H60-15 (CA5H) -H60-16 (CA5L) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Central Gateway ECU)

    Result:  OK

    OK 

    REPLACE CENTRAL GATEWAY ECU 

    (Refer to REMOVAL (07/2015 -) )

    Result:  NG

    NG 

    See step  2

  2. CHECK FOR OPEN IN CAN BUS LINES (NO. 2 CAN JUNCTION TERMINAL) 
    1. Reconnect the H60 central gateway ECU connector.
    2. Disconnect the P37 No. 2 CAN junction terminal connector.
      GTY613898Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      P37-3 (CANH) - P37-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to No. 2 CAN junction terminal)

    Result:  OK

    OK 

    REPLACE NO. 2 CAN JUNCTION TERMINAL 

    Result:  NG

    NG 

    See step  3

  3. CHECK FOR OPEN IN CAN BUS LINES (NO. 4 CAN J/C) 
    1. Reconnect the P37 No. 2 CAN junction terminal connector.
    2. Disconnect the H146 and H147 No. 4 CAN junction connectors.

      HINT: 

      • Connectors that connect to the CAN junction connector can be distinguished by the color of their CAN bus lines.
      • Reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.
      GTY672876Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to No. 4 CAN Junction Connector)      		 *b to Central gateway ECU
      *c to No. 5 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
      H146-1 (CANH) - H146-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Central gateway ECU
      H147-1 (CANH) - H147-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 5 CAN junction connector

      Wiring Color

      Code Color (CANH Side) Color (CANL Side) Connected to
      H146 L LG Central gateway ECU
      H147 G LG No. 5 CAN junction connector

      Result

      Result Proceed to
      OK A
      NG (Central gateway ECU main line) B
      NG (No. 5 CAN junction connector main line) C

    Result:  A

    A 

    REPLACE NO. 4 CAN JUNCTION CONNECTOR 

    Result:  B

    B 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CENTRAL GATEWAY ECU - NO. 4 CAN J/C) 

    Result:  C

    C 

    See step  4

  4. CHECK FOR OPEN IN CAN BUS LINES (NO. 5 CAN J/C) 
    1. Reconnect the H146 and H147 CAN junction connectors.
    2. Disconnect the U24 and U27 No. 5 CAN junction connectors.

      HINT: 

      • Connectors that connect to the CAN junction connector can be distinguished by the color of their CAN bus lines.
      • Reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.
      GTY667789Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to No. 5 CAN Junction Connector)      		 *b to No. 2 CAN junction terminal
      *c to No. 4 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
      U24-1 (CANH) - U24-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 4 CAN junction connector
      U27-1 (CANH) - U27-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction terminal

      Wiring Color

      Code Color (CANH Side) Color (CANL Side) Connected to
      U24 G LG No. 4 CAN junction connector
      U27 Y LG No. 2 CAN junction terminal

      Result

      Result Proceed to
      OK A
      NG (No. 4 CAN junction connector main line) B
      NG (No. 2 CAN junction terminal main line) C

    Result:  A

    A 

    REPLACE NO. 5 CAN JUNCTION CONNECTOR 

    Result:  B

    B 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 4 CAN J/C - NO. 5 CAN J/C) 

    Result:  C

    C 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 2 CAN JUNCTION TERMINAL - NO. 5 CAN J/C) 

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