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Home >> Lexus >> 2021 >> ES 350 Luxury >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Can Communication System (Except Hybrid) - Circuit Tests (3 Of 4) >> CAN COMMUNICATION SYSTEM (for Gasoline Model) >> Check Bus 4 Lines for Short Circuit [08/2020 - 08/2021] >> Procedure

Check Bus 4 Lines for Short Circuit [08/2020 - 08/2021]: Procedure

  1. CHECK FOR SHORT IN CAN BUS LINES (NO. 7 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the N99 No. 7 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY783214Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 7 CAN Junction Connector)      		 *b to Tire Pressure Warning ECU and Receiver
      *c to Occupant Detection ECU *d to Central Gateway ECU (Network Gateway ECU)
      *e to No. 4 CAN Junction Connector *f to Absorber Control ECU
      (w/ AVS System)

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      N99-1 (CANH) - N99-7 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Tire pressure warning ECU and receiver
      N99-2 (CANH) - N99-8 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Occupant detection ECU
      N99-3 (CANH) - N99-9 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Central gateway ECU (network gateway ECU)
      N99-4 (CANH) - N99-10 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 4 CAN junction connector
      N99-5 (CANH) - N99-11 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Absorber control ECU*
      1. *: w/ AVS System

      Result

      Result Proceed to
      OK A
      NG (Line to central gateway ECU (network gateway ECU)) B
      NG (Line to No. 4 CAN junction connector) C
      NG (Line to ECU or sensor) D

    Result: 

    A 

    REPLACE NO. 7 CAN JUNCTION CONNECTOR 

    Result: 

    C 

    See step  3

    Result: 

    D 

    See step  7

    Result: 

    B 

    See step  2

  2. CHECK FOR SHORT IN CAN BUS LINES (NO. 7 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) 
    1. Disconnect the G66 central gateway ECU (network gateway ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY803257Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 7 CAN Junction Connector)      		 *b to Central Gateway ECU (Network Gateway ECU)

      Standard Resistance

      Tester Connection Condition Specified Condition
      N99-3 (CANH) - N99-9 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to  REMOVAL [06/2018 - 08/2021] 

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) 

  3. CHECK FOR SHORT IN CAN BUS LINES (NO. 4 CAN JUNCTION CONNECTOR - NO. 7 CAN JUNCTION CONNECTOR) 
    1. Reconnect the N99 No. 7 CAN junction connector.
    2. Disconnect the G99 No. 4 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY820078Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 4 CAN Junction Connector)      		 *b to No. 7 CAN Junction Connector

      Standard Resistance

      Tester Connection Condition Specified Condition
      G99-6 (CANH) - G99-17 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Result
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 7 CAN JUNCTION CONNECTOR) 

    Result: 

    OK 

    See step  4

  4. CHECK FOR SHORT IN CAN BUS LINES (NO. 4 CAN JUNCTION CONNECTOR) 
    1. Reconnect the G99 No. 4 CAN junction connector.
    2. Disconnect the G98 No. 4 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY820066Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 4 CAN Junction Connector)      		 *b to No. 2 CAN Junction Connector
      *c to Steering Sensor - -

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      G98-6 (CANH) - G98-17 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction connector
      G98-7 (CANH) - G98-18 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Steering sensor

      Result

      Result Proceed to
      OK A
      NG (Line to No. 2 CAN junction connector) B
      NG (Line to ECU or sensor) C

    Result: 

    A 

    REPLACE NO. 4 CAN JUNCTION CONNECTOR 

    Result: 

    C 

    See step  7

    Result: 

    B 

    See step  5

  5. CHECK FOR SHORT IN CAN BUS LINES (NO. 2 CAN JUNCTION CONNECTOR) 
    1. Reconnect the G98 No. 4 CAN junction connector.
    2. Disconnect the A69 No. 2 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY955503Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 2 CAN Junction Connector)      		 *b to Brake Actuator Assembly
      *c to Airbag ECU Assembly *d to Rack and Pinion Power Steering Gear Assembly
      *e to No. 4 CAN Junction Connector *f to 4WD ECU Assembly
      (for AWD)

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      A69-1 (CANH) - A69-11 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Brake actuator assembly
      A69-2 (CANH) - A69-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Airbag ECU assembly
      A69-4 (CANH) - A69-14 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Rack and pinion power steering gear assembly
      A69-5 (CANH) - A69-15 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 4 CAN junction connector
      A69-7 (CANH) - A69-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher 4WD ECU Assembly*
      1. *: for AWD

      Result

      Result Proceed to
      OK A
      NG (Line to airbag ECU assembly) B
      NG (Line to No. 4 CAN junction connector) C
      NG (Line to ECU or sensor) D

    Result: 

    A 

    REPLACE NO. 2 CAN JUNCTION CONNECTOR 

    Result: 

    C 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - NO. 4 CAN JUNCTION CONNECTOR) 

    Result: 

    D 

    See step  7

    Result: 

    B 

    See step  6

  6. CHECK FOR SHORT IN CAN BUS LINES (NO. 2 CAN JUNCTION CONNECTOR - AIRBAG ECU ASSEMBLY) 
    1. Disconnect the G64 airbag ECU assembly connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY781687Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 2 CAN Junction Connector)      		 *b to Airbag ECU Assembly

      Standard Resistance

      Tester Connection Condition Specified Condition
      A69-2 (CANH) - A69-12 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [08/2020 - 08/2021] 

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - AIRBAG ECU ASSEMBLY) 

  7. CHECK FOR SHORT IN CAN BUS LINES (ECU OR SENSOR) 
    1. Reconnect all wire harness connectors.
    2. Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the short circuited branch line is connected.

      Refer to TERMINALS OF ECU [08/2020 - 08/2021]

    3. Measure the resistance according to the value(s) in the table below.
      GTY828189Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Central Gateway ECU (Network Gateway ECU))

      Standard Resistance

      Tester Connection Condition Specified Condition
      G66-22 (CA2H) - G66-7 (CA2L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

      HINT: 

      • If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
      • If the resistance does not become normal when the connector is disconnected from the ECU or sensor, check for a short in the wire harness and repair or replace the wire harness or connector if necessary.

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE ECU OR SENSOR 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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