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Home >> Lexus >> 2017 >> ES 350 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Can Communication System (W/ Central Gateway Ecu) (Diagnostic Codes & Symptom Tests) >> Can Communication System (W/ Central Gateway Ecu) >> Main Body ECU Communication Stop Mode (07/2015 -) >> Procedure

Main Body ECU Communication Stop Mode (07/2015 -): 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 H10 main body ECU (multiplex network body ECU) connector.
      GTY620389Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H10-14 (CANH) - H10-13 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Main Body ECU (Multiplex Network Body ECU)

    Result:  NG

    NG 

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

    Result:  OK

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Disconnect the 3B instrument panel junction block assembly connector.
      GTY676078Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the 3D instrument panel junction block assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3B-7 (GND1) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
    4. Reconnect the cable to the negative (-) battery terminal.
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      3D-31 (BECU) - Body ground Engine switch off 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Instrument Panel Junction Block Assembly)

    Result:  NG

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

    Result:  OK

    OK 

    See step  3

  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 NO. 2 RELAY AND ACC NO. 1 RELAY) 
    1. Remove the instrument panel junction block assembly (Refer to REMOVAL (07/2015 -) ).
    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
    3. Measure the resistance according to the value(s) in the table below.
      GTY645338Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Instrument Panel Junction Block Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      3E-1 - MB-32 (IG) Always 10 kΩ or higher
      3E-1 - MB-32 (IG) Battery positive (+) → 3A-27
      Battery negative (-) → 3B-7      		 Below 1 Ω
      3E-1 - MB-29 (ACC) Always 10 kΩ or higher
      3E-1 - MB-29 (ACC) Battery positive (+) → 3B-23
      Battery negative (-) → 3B-7      		 Below 1 Ω

    Result:  OK

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

    (Refer to REMOVAL (07/2015 -) )

    Result:  NG

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

    (Refer to REMOVAL (07/2015 -) )

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