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Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT FUSE (AM2) 
    1. Remove the AM2 fuse from the cowl side J/B RH.
    2. Measure the resistance of the fuse.

      Standard resistance: 

      Below 1 Ω 

    NG: REPLACE FUSE 

    OK: Go to Next Step 

  2. CHECK CONNECTORS 
    1. Check that the connectors are securely connected and the terminals are not deformed or loose.

      OK: 

      The connectors are securely connected and the terminals are not deformed or loose. 

    NG: REPAIR OR REPLACE CONNECTORS 

    OK: Go to Next Step 

  3. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND) 
    1. Disconnect the J55 ECU connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-33 (AM1) - Body ground Always 10 to 14 V
      J55-12 (AM2) - Body ground Always 10 to 14 V
    3. Measure the resistance according to the value (s) in the table below.
      Fig 1: Identifying J55 Power Source Control ECU Connector
      G05829079Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-6 (GND2) - Body ground Always Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  4. CHECK COWL SIDE JUNCTION BLOCK RH (ACC RELAY, PWR OUTLET RELAY) 
    1. Disconnect the RD and RA J/B connectors.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      RD-2 - RA-5 or RD-7 Always 68 to 250 Ω at 20°C (68°F)
      3. Fig 2: Identifying Cowl Side J/B RH Connectors
      G05829061Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  8

    OK: Go to Next Step 

  5. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND) 
    1. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-11 (ACCD) - RD-2 Always Below 1 Ω
      J55-11 (ACCD) - Body ground Always 10 kΩ or higher
      RA-5 - Body ground Always Below 1 Ω
      RD-7 - Body ground Always Below 1 Ω
    2. Connect each J/B connector with the power source control ECU connector disconnected.
    3. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-11 (ACCD) - Body ground Engine switch on (IG) Below 1 V
      4. Fig 3: Identifying J/B Connector With Power Source Control ECU Connector
      G05829089Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  9

    OK: Go to Next Step 

  6. INSPECT POWER SOURCE CONTROL ECU 
    1. Reconnect the J55 ECU connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-11 (ACCD) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 8 to 14 V
      3. Fig 4: Identifying J55 Power Source Control ECU Connector
      G05829090Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER SOURCE CONTROL ECU 

    OK: Go to Next Step 

  7. RECHECK FOR DTC 
    1. Delete the DTCs (See DIAGNOSIS SYSTEM  ).
    2. Check for DTCs again.

      OK: 

      DTC B2274 is not output. 

    NG: REPLACE POWER SOURCE CONTROL ECU 

    OK: CHECK INTERMITTENT PROBLEMS 

  8. REPLACE FAULTY J/B AND CHECK POWER SOURCE CONTROL ECU 
    1. Replace a faulty J/B and then connect the power source control ECU connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-11 (ACCD) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 8 to 14 V
      3. Fig 5: Identifying Terminal ACCD Of J55 Power Source Control ECU Connector
      G05829090Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER SOURCE CONTROL ECU 

    OK: END 

  9. REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR AND CHECK POWER SOURCE CONTROL ECU 
    1. Repair or replace a faulty wire harness or connector and then connect the power source control ECU connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-11 (ACCD) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 8 to 14 V
      3. Fig 6: Identifying Terminal ACCD Of J55 Power Source Control ECU Connector
      G05829090Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER SOURCE CONTROL ECU 

    OK: END 

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