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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 3 Line for Short to +B [08/2020 - 09/2022] >> Procedure

Check Bus 3 Line for Short to +B [08/2020 - 09/2022]: Procedure

  1. CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 4 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the G98 No. 4 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY955521Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3 - -
      *a Front view of wire harness connector
      (to No. 4 CAN Junction Connector)      		 *b to DCM (Telematics Transceiver)
      (w/ Telematics Transceiver)
      *c to Central Gateway ECU (Network Gateway ECU) - -

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      G98-8 (CANH) - G57-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher DCM (telematics transceiver)*
      G98-19 (CANL) - G57-16 (BAT)
      G98-9 (CANH) - G57-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Central gateway ECU (network gateway ECU)
      G98-20 (CANL) - G57-16 (BAT)
      G98-11 (CANH) - G57-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Central gateway ECU (network gateway ECU)
      G98-22 (CANL) - G57-16 (BAT)
      1. *: w/ Telematics Transceiver

      Result

      Result Proceed to
      OK A
      NG (Line to central gateway ECU (network gateway ECU)) B
      NG (Line to ECU or sensor) C

    Result: 

    B 

    See step  3

    Result: 

    C 

    See step  4

    Result: 

    A 

    See step  2

  2. CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 4 CAN JUNCTION CONNECTOR) 
    1. Disconnect the G99 No. 4 CAN junction connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY821401Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3 - -
      *a Front view of wire harness connector
      (to No. 4 CAN Junction Connector)      		 *b to Radio Receiver Assembly
      *c to Stereo Component Equalizer Assembly
      (w/ Active Noise Control System)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      G99-1 (CANH) - G57-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Radio receiver assembly
      G99-12 (CANL) - G57-16 (BAT)
      G99-2 (CANH) - G57-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Stereo component equalizer assembly*
      G99-13 (CANL) - G57-16 (BAT)
      1. *: w/ Active Noise Control System

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 4 CAN JUNCTION CONNECTOR 

    Result: 

    NG 

    See step  4

  3. CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 4 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.
      GTY821400Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3 - -
      *a Front view of wire harness connector
      (to No. 4 CAN Junction Connector)      		 *b to Central Gateway ECU (Network Gateway ECU)

      Standard Resistance

      Tester Connection Condition Specified Condition
      G98-9 (CANH) - G57-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      G98-20 (CANL) - G57-16 (BAT)
      G98-11 (CANH) - G57-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      G98-22 (CANL) - G57-16 (BAT)

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022] 

    Result: 

    NG 

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

  4. CHECK FOR SHORT TO +B IN CAN BUS LINE (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 bus line shorted to +B is connected.

      Refer to TERMINALS OF ECU [08/2020 - 08/2021] , or refer to TERMINALS OF ECU [08/2021 - 09/2022]

    3. Measure the resistance according to the value(s) in the table below.
      GTY786246Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3 - -
      *a Component with harness connected
      (Central Gateway ECU (Network Gateway ECU))      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      G66-6 (CA3H) - G57-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      G66-21 (CA3L) - G57-16 (BAT)

      HINT: 

      • If the resistance changes to 6 kΩ or higher 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 to +B 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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