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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.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-6 (GND2) - Body ground Always Below 1 Ω
      Fig 1: Identifying J55 Power Source Control ECU Connector
      G05829079Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step. 

  4. INSPECT RELAY (IG2 RELAY) 
    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 Relay)
      G04975652Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  8

    OK: Go to next step. 

  5. INSPECT JUNCTION BLOCK (RH-IG RELAY, LH-IG RELAY) 
    1. RH-IG relay:
      Fig 3: Identifying Cowl Side J/B RH Connectors
      G05829184Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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 - RD-12 Always Below 1 Ω
        RD-6 - Body ground Always 10 kΩ or higher
        RM-1 - RD-14 When battery voltage is applied to terminals RD-6 and RD-12 or RA-5 or RD-7) Below 1 Ω
    2. LH-IG relay:
      Fig 4: Identifying Cowl Side J/B LH Connectors
      G05829172Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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
        LM-1 - LK-6 When battery voltage is applied to terminals LD-13 and LD-8 or LD-9) Below 1 Ω
        LM-1 - LD-29 When battery voltage is applied to terminals LD-13 and LD-8 or LD-9) Below 1 Ω

    NG:  Go to step  8

    OK: Go to next step. 

  6. CHECK WIRE HARNESS 
    1. Inspect the resistance and voltage (Power source control ECU or battery - IG2 relay).
      Fig 5: Identifying J55 Power Source Control ECU And IG2 Relay
      G05829081Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the value (s) in the table below.

        Standard resistance 

        STANDARD RESISTANCE SPECIFICATION

        Tester Connection (Symbols) Condition Specified Condition
        J55-35 (IG2D) - IG2 relay terminal 2 Always Below 1 Ω
        IG2 relay terminal 1 - Body ground Always Below 1 Ω
        J55-35 (IG2D) or IG2 relay terminal 2 - Body ground Always 10 kΩ or higher
      2. Measure the voltage according to the value (s) in the table below.

        Standard voltage 

        STANDARD VOLTAGE SPECIFICATION

        Tester Connection Condition Specified Condition
        IG2 relay terminal 5 - Body ground Always 10 to 14 V
    2. Inspect the resistance and voltage (Power source control ECU or battery - Cowl side J/B RH).
      Fig 6: Identifying J55 Power Source Control ECU And Cowl Side J/B RH Connectors
      G05829174Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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) - RD-6 Always Below 1 Ω
        RD-7 - Body ground Always Below 1 Ω
        RA-5 - Body ground Always Below 1 Ω
        J55-34 (IG1D) or RD-6 - Body ground Always 10 kΩ or higher
      2. Measure the voltage according to the value (s) in the table below.

        Standard voltage 

        STANDARD VOLTAGE SPECIFICATION

        Tester Connection (Symbols) Condition Specified Condition
        RM-1 - Body ground Always 10 to 14 V
    3. Inspect the resistance (Cowl side J/B RH - Cowl side J/B LH).
      1. Measure the resistance according to the value (s) in the table below.

        Standard resistance 

        STANDARD RESISTANCE SPECIFICATION

        Tester Connection (Symbols) Condition Specified Condition
        RD-12 - LD-13 Always Below 1 Ω
        RD-12 - Body ground Always 10 kΩ or higher
        LD-8 - Body ground Always Below 1 Ω
        LD-9 - Body ground Always Below 1 Ω
        Fig 7: Identifying Cowl Side J/B RH And LH Connectors
        G05829073Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Inspect the voltage (Battery - Cowl side J/B LH).

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

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      LM-1 - Body ground Always 10 to 14V
      5. Fig 8: Identifying LM Cowl Side J/B LH Connectors
      G05829189Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  9

    OK: Go to next step. 

  7. INSPECT POWER SOURCE CONTROL ECU 
    1. Reconnect the 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 9: Identifying J55 Power Source Control ECU Connector
      G05829065Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER SOURCE CONTROL ECU 

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (COWL SIDE J/B - EACH SYSTEM) 

  8. 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
      J55-35 (IG2D) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 8 to 14 V
      3. Fig 10: Identifying J55 Power Source Control ECU Connector
      G05829065Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER SOURCE CONTROL ECU 

    OK: END 

  9. REPLACE FAULTY 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
      3. Fig 11: 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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