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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 ECU Connector
      G05829059Courtesy 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. INSPECT RELAY (IG2) 
    1. Remove the IG2 relay from the engine room R/B No. 2.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω (When battery voltage is applied to terminals 1 and 2)
      3. Fig 2: Inspecting Relay (IG2)
      G05829060Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  10

    OK: Go to Next Step 

  5. INSPECT JUNCTION BLOCK 
    1. RH-IG relay:
      1. Disconnect the cowl side J/B RH connectors.
      2. Measure the resistance according to the value (s) in the table below.

        Standard resistance 

        STANDARD RESISTANCE SPECIFICATION

        Tester Connection Condition Specified Condition
        RD-6 - RA-5 or RD-7 Always 136 to 250 Ω at 20°C (68°F)
        RD-6 - Body ground Always 10 kΩ or higher
        Fig 3: Identifying Cowl Side J/B RH Connectors
        G05829061Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. LH-IG relay:
      1. Disconnect the cowl side J/B LH connectors.
      2. Measure the resistance according to the value (s) in the table below.

        Standard resistance 

        STANDARD RESISTANCE SPECIFICATION

        Tester Connection Condition Specified Condition
        LD-13 - LD-8 or LD-9 Always 68 to 250 Ω at 20°C (68°F)
        LD-13 - Body ground Always 10 kΩ or higher
      3. Fig 4: Identifying Cowl Side J/B LH Connectors
      G05829062Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  10

    OK: Go to Next Step 

  6. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - 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
      J55-34 (IG1D) - Body ground Always 10 kΩ or higher
      J55-35 (IG2D) - Body ground Always 10 kΩ or higher
      2. Fig 5: Identifying J55 Power Source Control ECU Connector
      G05829063Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  11

    OK: Go to Next Step 

  7. CHECK WIRE HARNESS (COWL SIDE J/B LH - BODY GROUND) 
    1. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      LD-13 - Body ground Always 10 kΩ or higher
      2. Fig 6: Identifying LD Cowl Side J/B LH Connector
      G05829064Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  11

    OK: Go to Next Step 

  8. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND) 
    1. Reconnect the J55 ECU and J/B connectors.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-34 (IG1D) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 8 to 14 V
      J55-35 (IG2D) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 8 to 14 V
      3. Fig 7: Identifying J55 Power Source Control ECU Connector
      G05829065Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER SOURCE CONTROL ECU 

    OK: Go to Next Step 

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

      OK: 

      DTC B2271 is not output. 

    NG: REPLACE POWER SOURCE CONTROL ECU 

    OK: CHECK INTERMITTENT PROBLEMS 

  10. REPLACE FAULTY RELAY OR J/B AND CHECK POWER SOURCE CONTROL ECU 
    1. Replace a faulty relay or 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
      J55-34 (IG1D) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 8 to 14 V
      J55-3S (IG2D) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 8 to 14 V
      3. Fig 8: Identifying J55 Power Source Control ECU Connector
      G05829065Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER SOURCE CONTROL ECU 

    OK: END 

  11. 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
      J55-34 (IG1D) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 8 to 14 V
      J55-35 (IG2D) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 8 to 14 V
      3. Fig 9: Identifying J55 Power Source Control ECU Connector
      G05829065Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER SOURCE CONTROL ECU 

    OK: END 

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