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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 (4 Of 4) >> CAN COMMUNICATION SYSTEM (for Gasoline Model) >> Check Bus 5 Lines for Short Circuit [08/2021 - ] >> Procedure

Check Bus 5 Lines for Short Circuit [08/2021 - ]: Procedure

  1. CHECK FOR SHORT IN CAN BUS LINES (NO. 1 JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the N97 No. 1 junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY820061Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 1 Junction Connector)      		 *b to Central Gateway ECU (Network Gateway ECU)
      *c to Headlight ECU Sub-assembly RH *d to Outer Mirror Control ECU Assembly RH
      (w/ Seat Position Memory System)
      *e to No. 8 CAN Junction Connector - -

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      N97-8 (CANH) - N97-19 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Central gateway ECU (network gateway ECU)
      N97-9 (CANH) - N97-20 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Headlight ECU sub-assembly RH
      N97-10 (CANH) - N97-21 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Outer mirror control ECU assembly RH*
      N97-11 (CANH) - N97-22 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 8 CAN junction connector
      1. *: w/ Seat Position Memory System

      Result

      Result Proceed to
      OK A
      NG (Line to central gateway ECU (network gateway ECU)) B
      NG (Line to No. 8 CAN junction connector) C
      NG (Line to ECU or sensor) D

    Result: 

    A 

    REPLACE NO. 1 JUNCTION CONNECTOR 

    Result: 

    C 

    See step  3

    Result: 

    D 

    See step  6

    Result: 

    B 

    See step  2

  2. CHECK FOR SHORT IN CAN BUS LINES (NO. 1 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.
      GTY820030Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 1 Junction Connector)      		 *b to Central Gateway ECU (Network Gateway ECU)

      Standard Resistance

      Tester Connection Condition Specified Condition
      N97-8 (CANH) - N97-19 (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 [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

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

  3. CHECK FOR SHORT IN CAN BUS LINES (NO. 8 CAN JUNCTION CONNECTOR) 
    1. Reconnect the N97 No. 1 junction connector.
    2. Disconnect the N101 No. 8 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY803256Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 8 CAN Junction Connector)      		 *b to Outer Mirror Control ECU Assembly LH
      (w/ Seat Position Memory System)
      *c to Luggage Closer Motor Assembly
      (w/ Power Trunk Lid System)      		 *d to No. 5 CAN Junction Connector
      *e to No. 1 Junction Connector *f to Position Control ECU Assembly LH
      (w/ Seat Position Memory System)

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      N101-1 (CANH) - N101-7 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Outer mirror control ECU assembly LH*1
      N101-2 (CANH) - N101-8 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Luggage closer motor assembly*2
      N101-3 (CANH) - N101-9 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 5 CAN junction connector
      N101-4 (CANH) - N101-10 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 junction connector
      N101-5 (CANH) - N101-11 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Position control ECU assembly LH*1
      • *1: w/ Seat Position Memory System
      • *2: w/ Power Trunk Lid System

      Result

      Result Proceed to
      OK A
      NG (Line to No. 1 junction connector) B
      NG (Line to No. 5 CAN junction connector) C
      NG (Line to ECU or sensor) D

    Result: 

    A 

    REPLACE NO. 8 CAN JUNCTION CONNECTOR 

    Result: 

    B 

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

    Result: 

    D 

    See step  6

    Result: 

    C 

    See step  4

  4. CHECK FOR SHORT IN CAN BUS LINES (NO. 5 CAN JUNCTION CONNECTOR) 
    1. Reconnect the N101 No. 8 CAN junction connector.
    2. Disconnect the G97 No. 5 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY820062Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 5 CAN Junction Connector)      		 *b to Air Conditioning Amplifier Assembly
      *c to Certification ECU (Smart Key ECU Assembly) *d to Headlight ECU Sub-assembly LH
      *e to Main Body ECU (Multiplex Network Body ECU) *f to No. 8 CAN Junction Connector
      *g to Combination Meter Assembly *h to Meter Mirror Sub-assembly
      (w/ Headup Display System)
      *i to Multiplex Tilt and Telescopic ECU
      (w/ Power Tilt and Power Telescopic System)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      G97-3 (CANH) - G97-14 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Air conditioning amplifier assembly
      G97-4 (CANH) - G97-15 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Certification ECU (smart key ECU assembly)
      G97-5 (CANH) - G97-16 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Headlight ECU sub-assembly LH
      G97-6 (CANH) - G97-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Main body ECU (multiplex network body ECU)
      G97-7 (CANH) - G97-18 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 8 CAN junction connector
      G97-8 (CANH) - G97-19 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Combination meter assembly
      G97-9 (CANH) - G97-20 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Meter mirror sub-assembly*1
      G97-10 (CANH) - G97-21 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Multiplex tilt and telescopic ECU*2
      • *1: w/ Headup Display System
      • *2: w/ Power Tilt and Power Telescopic System

      Result

      Result Proceed to
      OK A
      NG (Line to No. 8 CAN junction connector) B
      NG (Line to combination meter assembly) C
      NG (Line to ECU or sensor) D

    Result: 

    A 

    REPLACE NO. 5 CAN JUNCTION CONNECTOR 

    Result: 

    B 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - NO. 8 CAN JUNCTION CONNECTOR) 

    Result: 

    D 

    See step  6

    Result: 

    C 

    See step  5

  5. CHECK FOR SHORT IN CAN BUS LINES (NO. 5 CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY) 
    1. Disconnect the G17 combination meter assembly connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY820029Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 5 CAN Junction Connector)      		 *b to Combination Meter Assembly

      Standard Resistance

      Tester Connection Condition Specified Condition
      G97-8 (CANH) - G97-19 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [08/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY) 

  6. 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 [08/2021 - 09/2022] , or refer to TERMINALS OF ECU [09/2022 - ]

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G66-15 (CA5H) - G66-16 (CA5L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      GTY779260Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Central Gateway ECU (Network Gateway ECU))

      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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