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Unlock Position Sensor Signal Circuit: Procedure

  1. CHECK STEERING LOCK ECU 
    Fig 1: Identifying Steering Lock ECU Connector Terminals
    GTY239663Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      Tester Connection Condition (Steering Lock Position) Specified Condition
      4 (SLP1) - 2 (SGND) Locked 11 to 14 V
      4 (SLP1) - 2 (SGND) Unlocked Below 1.2 V

    NG → See step   3 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - MAIN BODY ECU) 
    1. Disconnect the E77 and E15 ECU connectors.
      Fig 2: Identifying Steering Lock ECU - Main Body ECU Connector Terminals
      GTY310064Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      Tester Connection Condition Specified Condition
      E15-18 (SLP) - E77-4 (SLP1) Always Below 1 Ω
      E77-4 (SLP1) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   6 

  3. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BODY GROUND) 
    Fig 3: Identifying E77 Connector Terminals
    GTY243274Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E77 ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      Tester Connection Condition Specified Condition
      E77-1 (GND) - Body ground Always Below 1 Ω
      E77-2 (SGND) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (BATTERY - STEERING LOCK ECU) 
    Fig 4: Identifying E77 ECU Connector Terminals
    GTY243275Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E77 ECU connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      Tester Connection Condition Specified Condition
      E77-7 (B) - E77-2 (SGND) Always 11 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - MAIN BODY ECU) 
    1. Disconnect the E77 and E15 ECU connectors.
      Fig 5: Identifying Steering Lock ECU - Main Body ECU Connector Terminals
      GTY310064Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      Tester Connection Condition Specified Condition
      E15-18 (SLP) - E77-4 (SLP1) Always Below 1 Ω
      E77-4 (SLP1) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   6 

  6. REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU). Refer to  REMOVAL 
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