LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2017 >> RC 350 Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Can Communication System - Circuit Tests (2 Of 5) >> Can Communication System >> Main Body ECU Communication Stop Mode [09/2014 - 11/2017] >> Procedure

Main Body ECU Communication Stop Mode [09/2014 - 11/2017]: Procedure

  1. CHECK FOR OPEN IN CAN BUS LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) BRANCH LINE) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the O2 main body ECU (multiplex network body ECU) connector.
      GTY504274Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Main Body ECU (Multiplex Network Body ECU))
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O2-14 (CANH) - O2-13 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

      Result

      Result 
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Remove the main body ECU (multiplex network body ECU).

      Refer to REMOVAL [09/2014 - ]

    2. Measure the resistance according to the value(s) in the table below.
      GTY496045Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Instrument Panel Junction Block Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      MB-11 (GND1) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
    3. Reconnect the cable to the negative (-) battery terminal.
    4. Measure the voltage according to the value(s) in the table below.
      GTY517179Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Instrument Panel Junction Block Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      MB-30 (ACC) - Body ground Engine switch on (ACC) 11 to 14 V
      MB-31 (BECU) - Body ground Always 11 to 14 V
      MB-32 (IG) - Body ground Engine switch on (IG) 11 to 14 V

      Result

      Result  Proceed to
      OK A
      NG (BECU) B
      NG (IG) C
      NG (ACC) D
      NG (GND1) E

    Result: 

    A 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [09/2014 - ] 

    Result: 

    C 

    GO TO LIGHTING (INT) SYSTEM (IG SIGNAL CIRCUIT). Refer to  IG Signal Circuit [09/2014 - ] 

    Result: 

    D 

    GO TO LIGHTING (INT) SYSTEM (ACC SIGNAL CIRCUIT). Refer to  ACC Signal Circuit [09/2014 - ] 

    Result: 

    E 

    See step  4

    Result: 

    B 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (BECU SIGNAL CIRCUIT) 
    1. Disconnect the 4F instrument panel junction block assembly connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY509441Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Instrument Panel Junction Block Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      4F-1 - Body ground Always 11 to 14 V

      Result

      Result 
      OK
      NG

    Result: 

    OK 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [09/2014 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

  4. CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the 4B instrument panel junction block assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY501306Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Instrument Panel Junction Block Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      4B-7 - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω

      Result

      Result 
      OK
      NG

    Result: 

    OK 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [09/2014 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

scientia non olet · About LEMON Manuals