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Home >> Lexus >> 2020 >> UX 200 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 50 (Can Communication System (Symptom Tests) (3 Of 3) (Hybrid)) >> CAN COMMUNICATION SYSTEM (for HV Model) >> Check Bus 5 Lines for Short Circuit [07/2022 - ] >> Procedure

Check Bus 5 Lines for Short Circuit [07/2022 - ]: Procedure

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  1. CHECK FOR SHORT IN CAN BUS LINES (NO. 6 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the No. 6 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY779888Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 6 CAN Junction Connector)      		 *b to No. 1 CAN Junction Connector
      *c to Air Conditioning Amplifier Assembly *d to Central Gateway ECU (Network Gateway ECU)
      *e to Certification ECU (Smart Key ECU Assembly) - -

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      F93-1 (CANH) - F93-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 1 CAN junction connector
      F93-2 (CANH) - F93-13 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Air conditioning amplifier assembly
      F93-3 (CANH) - F93-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Central gateway ECU (network gateway ECU)
      F93-4 (CANH) - F93-15 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Certification ECU (smart key ECU assembly)

      Result

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

    Result: 

    A 

    REPLACE NO. 6 CAN 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. 6 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) 
    1. Disconnect the F61 central gateway ECU (network gateway ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY779890Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 6 CAN Junction Connector)      		 *b to Central Gateway ECU (Network Gateway ECU)

      Standard Resistance

      Tester Connection Condition Specified Condition
      F93-3 (CANH) - F93-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to  REMOVAL [07/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) 

  3. CHECK FOR SHORT IN CAN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR) 
    1. Reconnect the F93 No. 6 CAN junction connector.
    2. Disconnect the No. 1 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY786586Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 1 CAN Junction Connector)      		 *b to No. 6 CAN Junction Connector
      *c to No. 1 Headlight ECU Sub-assembly RH
      (w/ Automatic Headlight Beam Level Control System)      		 *d to No. 1 Headlight ECU Sub-assembly LH
      (w/ Automatic Headlight Beam Level Control System)
      *e to Main Body ECU (Multiplex Network Body ECU) *f to Meter Mirror Sub-assembly
      (w/ Headup Display)
      *g to No. 9 CAN Junction Connector *h to Multiplex Tilt and Telescopic ECU
      (for Power Tilt and Power Telescopic Steering Column)
      *i to Outer Mirror Control ECU Assembly RH
      (w/ Seat Position Memory System)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      F85-1 (CANH) - F85-11 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 6 CAN junction connector
      F85-2 (CANH) - F85-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Headlight ECU sub-assembly RH*4
      F85-3 (CANH) - F85-13 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Headlight ECU sub-assembly LH*4
      F85-4 (CANH) - F85-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Main body ECU (multiplex network body ECU)
      F85-6 (CANH) - F85-16 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Meter mirror sub-assembly*1
      F85-7 (CANH) - F85-17 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 9 CAN junction connector
      F85-9 (CANH) - F85-19 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Multiplex tilt and telescopic ECU*2
      F85-10 (CANH) - F85-20 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Outer mirror control ECU assembly RH*3
      1. *1: w/ Headup Display
      2. *2: w/ Power Tilt and Power Telescopic Steering Column
      3. *3: w/ Seat Position Memory System
      4. *4: w/ Automatic Headlight Beam Level Control System

      Result

      Result Proceed to
      OK A
      NG (Line to No. 6 CAN junction connector) B
      NG (Line to No. 9 CAN junction connector) C
      NG (Line to ECU or sensor) D

    Result: 

    A 

    REPLACE NO. 1 CAN JUNCTION CONNECTOR 

    Result: 

    B 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - NO. 6 CAN JUNCTION CONNECTOR) 

    Result: 

    D 

    See step  6

    Result: 

    C 

    See step  4

  4. CHECK FOR SHORT IN CAN BUS LINES (NO. 9 CAN JUNCTION CONNECTOR) 
    1. Reconnect the F85 No. 1 CAN junction connector.
    2. Disconnect the No. 9 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY1123139Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 9 CAN Junction Connector)      		 *b to Multiplex Network Door ECU
      (w/ Power Back Door)
      *c to Combination Meter Assembly *d to No. 1 CAN Junction Connector
      *e to Position Control ECU Assembly LH
      (w/ Seat Position Memory System)      		 *f to Outer Mirror Control ECU Assembly LH
      (w/ Seat Position Memory System)

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      N112-1 (CANH) - N112-7 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Multiplex network door ECU*1
      N112-2 (CANH) - N112-8 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Combination meter assembly
      N112-4 (CANH) - N112-10 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 1 CAN junction connector
      N112-5 (CANH) - N112-11 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Position control ECU assembly LH*2
      N112-6 (CANH) - N112-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Outer mirror control ECU assembly LH*2
      1. *1: w/ Power Back Door
      2. *2: w/ Seat Position Memory System

      Result

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

    Result: 

    A 

    REPLACE NO. 9 CAN JUNCTION CONNECTOR 

    Result: 

    B 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - NO. 9 CAN JUNCTION CONNECTOR) 

    Result: 

    D 

    See step  6

    Result: 

    C 

    See step  5

  5. CHECK FOR SHORT IN CAN BUS LINES (NO. 9 CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY) 
    1. Disconnect the combination meter assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F23-29 (CANH) - F23-30 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 1 MΩ or higher
      GTY830511Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Combination Meter Assembly)

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [07/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 9 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 [07/2022 - ]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      F61-15 (CA5H) - F61-16 (CA5L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      GTY786165Courtesy 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

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECU OR SENSOR 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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