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Inspection Procedure

WARNING: This page is about a different car, the 2009 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK BODY ECU 
    1. Disconnect the A24 sensor connector.
      2. Fig 1: Checking Body ECU
      G04475805Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION - SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      1 (CLTB) - 3 (CLTE) Power switch ON (IG) 10 to 14 V

    NG : Go to step   4 

    OK : GO TO NEXT STEP 

  2. CHECK WIRE HARNESS (ECU - SENSOR) 
    1. Disconnect the A24 sensor connector.
    2. Disconnect the B6 ECU connector.
      3. Fig 2: Checking Wire Harness (ECU - Sensor)
      G04475806Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION - SPECIFIED CONDITION

      Tester Connection Specified Condition
      A24-4 (CLTS) - B6-15 (CLTS) Below 1Ω

    NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK : GO TO NEXT STEP 

  3. REPLACE AUTOMATIC LIGHT CONTROL SENSOR 

    OK : Returns to normal operation. 

    NG : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

    OK : END 

  4. CHECK WIRE HARNESS (SENSOR - BODY GROUND) 
    1. Disconnect the A24 ECU connector.
      2. Fig 3: Checking Wire Harness (Sensor - Body Ground)
      G04475807Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION - SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      A24-1 (CLTB) - Body ground Power switch ON (IG) 10 to 14 V

    NG : Go to step   6 

    OK : GO TO NEXT STEP 

  5. CHECK WIRE HARNESS (ECU - SENSOR) 
    1. Disconnect the A24 sensor connector.
    2. Disconnect the B6 ECU connector.
      3. Fig 4: Checking Wire Harness (ECU - Sensor)
      G04475808Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION - SPECIFIED CONDITION

      Tester Connection Specified Condition
      A24-3 (CLTE) - B6-14 (CLTE) Below 1Ω

    NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

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

  6. CHECK WIRE HARNESS (ECU - SENSOR) 
    1. Disconnect the A24 sensor connector.
    2. Disconnect the B6 ECU connector.
      3. Fig 5: Checking Wire Harness (ECU - Sensor)
      G04475809Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION - SPECIFIED CONDITION

      Tester Connection Specified Condition
      A24-1 (CLTB) - B6-16 (CLTB) Below 1Ω

    NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

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

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