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Ignition Switch Circuit: Procedure

  1. READ VALUE USING TECHSTREAM 
    1. Connect Techstream to the DLC3.
    2. Turn the ignition switch on (IG).
    3. Turn Techstream on.
    4. Select the following menu items: Body Electrical / Main Body / Data List.
    5. Read the display on Techstream.
      MAIN BODY:

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      ACC SW Ignition switch or engine switch ACC signal / ON or OFF ON: Ignition switch on (IG or ACC)
      OFF: Ignition switch off      		 -
      IG SW Ignition switch or engine switch IG signal / ON or OFF ON: Ignition switch on (IG)
      OFF: Ignition switch off      		 -

      OK

      Normal conditions listed above are displayed.

    OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  PROBLEM SYMPTOMS TABLE 

    NG: Go to next step 

  2. INSPECT ACC RELAY 
    1. Remove the ACC relay from the instrument panel J/B assembly.
      Fig 1: Identifying ACC Relay Of Instrument Panel J/B Assembly
      GTY195825Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      Below 1 Ω (When battery voltage is applied to terminals 1 and 2)

    NG → REPLACE ACC RELAY 

    OK: Go to next step 

  3. INSPECT NO. 1 IGNITION RELAY 
    1. Remove the No. 1 ignition relay from the instrument panel J/B assembly.
      Fig 2: Identifying ACC Relay Of Instrument Panel J/B Assembly
      GTY195825Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      Below 1 Ω (When battery voltage is applied to terminals 1 and 2)

    NG → REPLACE NO. 1 IGNITION RELAY 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B ASSEMBLY - BATTERY AND GROUND) 
    1. Disconnect the IA instrument panel J/B assembly connector.
      Fig 3: Identifying IA Instrument Panel J/B Assembly Connector Terminals
      GTY206501Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Condition Specified Condition
      IA-1 - Body ground Always 10 to 14 V
    3. Disconnect the IF instrument panel J/B assembly connector.
      Fig 4: Identifying IF Instrument Panel J/B Assembly Connector Terminal
      GTY206500Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      IF-10 - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. CHECK VEHICLE CONDITION 
    1. Check the vehicle condition.

      Result

      Condition Proceed to
      without Smart Key System A
      with Smart Key System B

    B → See step   8 

    A: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B ASSEMBLY - IGNITION SWITCH) 
    1. Disconnect the E23 ignition switch connector.
      Fig 5: Checking Harness And Connector (Instrument Panel J/B Assembly -- Ignition Switch)
      GTY206499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the II instrument panel J/B assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      II-3 - E23-2 (ACC) Always Below 1 Ω
      II-4 - E23-4 (AM1) Always Below 1 Ω
      II-9 - E23-1 (IG1) Always Below 1 Ω
      II-3 - Body ground Always 10 kΩ or higher
      II-4 - Body ground Always 10 kΩ or higher
      II-9 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  7. INSPECT IGNITION SWITCH 
    1. Inspect the ignition switch. Refer to ON-VEHICLE INSPECTION - Step 1

      OK

      Ignition switch is normal.

    NG → REPLACE IGNITION SWITCH 

    OK → REPLACE INSTRUMENT PANEL J/B ASSEMBLY 

  8. CHECK HARNESS AND CONNECTOR (BATTERY - MAIN BODY ECU) 
    1. Disconnect the E7 main body ECU connector.
      Fig 6: Identifying E7 Main Body ECU Connector Terminal
      GTY206504Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Condition Specified Condition
      E7-6 (AM1) - Body ground Always 10 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  9. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B ASSEMBLY - MAIN BODY ECU) 
    1. Disconnect the E7 main body ECU connector.
      Fig 7: Identifying E7 Main Body ECU Connector Terminal And II Instrument Panel J/B Assembly Connector Terminal
      GTY206485Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the II instrument panel J/B assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      II-3 - E7-22 (ACCD) Always Below 1 Ω
      II-9 - E7-3 (IG1D) Always Below 1 Ω
      II-3 - Body ground Always 10 kΩ or higher
      II-9 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  10. CHECK HARNESS AND CONNECTOR (ENGINE SWITCH - MAIN BODY ECU AND BODY GROUND) 
    1. Disconnect the E52 engine switch connector.
      Fig 8: Identifying E52 Engine Switch Connector Terminal And E7 Main Body ECU Connector Terminal
      GTY206497Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E7 main body ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      E52-7 (SS1) - E7-17 (SSW1) Always Below 1 Ω
      E52-2 (SS2) - E7-16 (SSW2) Always Below 1 Ω
      E52-5 (GND) - Body ground Always 10 kΩ or higher
      E52-4 (COM) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  11. INSPECT ENGINE SWITCH 
    1. Inspect the engine switch. Refer to INSPECTION - Step 1 .

      OK

      Engine switch is normal.

    NG → REPLACE ENGINE SWITCH 

    OK → REPLACE INSTRUMENT PANEL J/B ASSEMBLY 

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