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Touch Sensor Circuit: Procedure

  1. READ VALUE USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Following the display on the tester, select "Data List".
      SMART KEY (CERTIFICATION ECU):

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      D Touch Sensor Status of touch sensor front LH/ ON or OFF ON: Touch sensor is touched
      OFF: Touch sensor is not touched      		 -
      P Touch Sensor Status of touch sensor front RH/ ON or OFF ON: Touch sensor is touched
      OFF: Touch sensor is not touched      		 -

      OK

      "ON" (screen is touched) or "OFF" (screen is not touched) appears on the tester screen.

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

    NG: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ELECTRICAL KEY OSCILLATOR) 
    1. Disconnect the P33 ECU connector.
      Fig 1: Identifying Certification ECU And Electrical Key Oscillator Connector Terminals
      GTY119516Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the oscillator connectors.

      Standard resistance

      Tester Connection (Symbols) Condition Specified Condition
      P33-5 (SEL1) - o2-4 (SEL) Always Below 1 Ω
      P33-22 (SEN1) - o2-6 (SENS) Always Below 1 Ω
      P33-6 (SEL2) - n2-4 (SEL) Always Below 1 Ω
      P33-23 (SEN2) - n2-6 (SENS) Always Below 1 Ω
      P33-5 (SEL1) - Body ground Always 10 kΩor higher
      P33-22 (SEN1) - Body ground Always 10 kΩor higher
      P33-6 (SEL2) - Body ground Always 10 kΩor higher
      P33-23 (SEN2) - Body ground Always 10 kΩor higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. CHECK AND REPLACE ELECTRICAL KEY OSCILLATOR (CHECK OPERATION OF OSCILLATOR) 
    1. Replace the door oscillator.
    2. Check that the entry UNLOCK function operates normally.

      OK

      Entry UNLOCK function operates normally.

    NG → END (ELECTRICAL KEY OSCILLATOR IS DEFECTIVE) 

    OK: Go to next step 

  4. INSPECT CERTIFICATION ECU 
    1. Reconnect the ECU and the oscillator connectors.
      Fig 2: Identifying Certification ECU
      GTY124336Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the Techstream to the DLC3.
    3. Turn the engine switch on (IG).
    4. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Symbols (Tester Connection) Condition Specified Condition
      SEL1 (P33-5) - Body ground Move the key more than 5 m (16.4 ft) away from the front door LH 10 to 14 V
      SEL1 (P33-5) - Body ground Bring it to the outside handle Below 1V
      SEL2 (P33-6) - Body ground Move the key more than 5 m (16.4 ft) away from the front door RH 10 to 14 V
      SEL2 (P33-6) - Body ground Bring it to the outside handle Below 1V
      SEN1 (P33-22) - Body ground Front door LH outside handle is not held 10 to 14 V
      SEN1 (P33-22) - Body ground Front door LH outside handle is held Below 1V
      SEN2 (P33-23) - Body ground Front door RH outside handle is not held 10 to 14 V
      SEN2 (P33-23) - Body ground Front door RH outside handle is held Below 1V

    NG → REPLACE CERTIFICATION ECU 

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

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