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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. CHECK FOR DTCS 
    1. Delete the DTCs (See DIAGNOSIS SYSTEM  ).

      HINT:

      After all the DTCs are cleared, check if the trouble occurs again 5 seconds after the engine switch is turned on (IG).

    2. Check for DTCs again.

      OK: 

      No DTC is output. 

    NG: GO TO DTC CHART 

    OK: Go to next step. 

  5. READ VALUE OF TECHSTREAM 
    1. Connect Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Check the DATA LIST for proper functioning of the start switches 1 and 2.

      Body: 

      TESTER DISPLAY REFERENCE

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Start Switch 1 Start Switch 1/ ON or OFF ON: Engine switch on (IG)
      OFF: Engine switch OFF      		 -
      Start Switch 2 Start Switch 2/ ON or OFF ON: Engine switch on (IG)
      OFF: Engine switch OFF      		 -

      OK: 

      ON (engine switch on (IG)) and OFF (engine switch off) appear on the screen. 

    NG:  Go to step  10

    OK: Go to next step. 

  6. 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: REPLACE RELAY (IG2) 

    OK: Go to next step. 

  7. INSPECT JUNCTION BLOCK (RH-IG RELAY, LH-IG RELAY, ACC RELAY, PWR POINT 
    1. RH-IG relay:
      Fig 3: Identifying Cowl Side J/B RH Connectors
      G05829171Courtesy 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 - Body ground Always 10 kΩ or higher
        RD-2 - RA-5 or RD-7 Always 68 to 250 Ω at 20°C (68°F)
        RD-2 - Body ground Always 10 kΩ or higher
        RD-6 - RD-12 Always Below 1 Ω
        RM-1 - RD-14 When battery voltage is applied to terminals RD-6 and RA-5 or RD-7 Below 1 Ω
        RM-1 - RD-27 When battery voltage is applied to terminals RD-2 and RA-5 or RD-7 Below 1 Ω
        RM-1-RJ-16 When battery voltage is applied to terminals RD-2 and 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: REPLACE JUNCTION BLOCK 

    OK: Go to next step. 

  8. 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
        J55-11 (ACCD) - RD-2 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
        J55-11 (ACCD) or RD-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
        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
        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).
      1. Measure the voltage according to the value (s) in the table below.

        Standard voltage 

        STANDARD VOLTAGE SPECIFICATION

        Tester Connection Condition Specified Condition
        LM-1 - Body ground Always 10 to 14 V
      Fig 8: Identifying Cowl Side J/B LH Connectors
      G05829176Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step. 

  9. 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
      J55-34 (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
      J55-11 (ACCD) - Body ground Engine switch off Below 1 V
      Engine switch on (ACC) 8 to 14 V
      3. Fig 9: Identifying J55 Power Source Control ECU Connector
      G05829177Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER SOURCE CONTROL ECU 

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

  10. INSPECT ENGINE SWITCH 
    1. Remove the engine switch.
      Fig 10: Identifying Engine Switch Connector
      G05829178Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance of the switch.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Switch Condition Specified Condition
      7 (SS1) - 5 (GND) Pushed Below 1 Ω
      2 (SS2) - 5 (GND) Pushed Below 1 Ω
      7 (SS1) - 5 (GND) Not pushed 10 kΩ or higher
      2 (SS2) - 5 (GND) Not pushed 10 kΩ or higher

    NG: REPLACE ENGINE SWITCH 

    OK: Go to next step. 

  11. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU AND BODY GROUND ENGINE SWITCH) 
    1. Disconnect the J55 ECU connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J31-7 (SS1) - J55-14 (SSW1) Always Below 1 Ω
      J31-2 (SS2) - J55-37 (SSW2) Always Below 1 Ω
      J31-5 (GND) - Body ground Always Below 1 Ω
      J31-7 (SS1) or J55-14 (SSW1) - Body ground Always 10 kΩ or higher
      J31-2 (SS2) or J55-37 (SSW2) - Body ground Always 10 kΩ or higher
      3. Fig 11: Identifying J31 Engine Switch And J55 Power Source Control ECU Connectors
      G05829179Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE POWER SOURCE CONTROL ECU 

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