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Home >> Lexus >> 2009 >> LS 460L RWD >> Repair and Diagnosis >> Accessories & Equipment >> Warning Systems >> Park Assist/Monitoring >> Intuitive Parking Assist System >> DTC C1AED Rear Sensor Communication Malfunction >> Inspection Procedure

Inspection Procedure

  1. CHECK DTC OUTPUT 
    1. Clear the DTCs (see DTC CHECK/CLEAR ).
    2. Check for DTCs (see DTC CHECK/CLEAR ).

      Result 

      DTC OUTPUT RESULT

      Result Proceed to
      DTC C1AED is output (w/o advanced parking guidance system) A
      DTC C1AED is output (w/ advanced parking guidance system) B
      No DTC is output C

    B:  Go to step  16

    C: END 

    A: Go to Next Step 

  2. CHECK CLEARANCE WARNING ECU 
    1. Reconnect the L19 ECU connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITIONS

      Tester Connection Condition Specified Condition
      L19-18 (E2) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFIED CONDITIONS

      Tester Connection Condition Specified Condition
      L19-7 (BOR) -Body ground Engine switch on (IG) 7.2 to 8.8 V
    Fig 1: Identifying L19 Clearance Warning ECU Connector Terminals
    G05253421Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE CLEARANCE WARNING ECU  (See REMOVAL )

    OK: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - REAR RIGHT CORNER SENSOR) 
    1. Disconnect the L19 ECU connector.
    2. Disconnect the Z4 sensor connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITIONS

      Tester Connection Condition Specified Condition
      L19-7 (BOR) - Z4-1 (BI) Always Below 1 Ω
      L19-24 (SOR) - Z4-3 (SI) Always Below 1 Ω
      L19-18 (E2) - Z4-5 (EI) Always Below 1 Ω
      L19-7 (BOR) -Body ground Always 10 kΩ or higher
      L19-24 (SOR) - Body ground Always 10 kΩ or higher
      L19-18 (E2) - Body ground Always 10 kΩ or higher
      Fig 2: Identifying L19 Clearance Warning ECU And Z4 Rear Right Corner Sensor Connector Terminals
      G04951868Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to Next Step 

  4. CHECK HARNESS AND CONNECTOR (REAR RIGHT CORNER SENSOR - REAR RIGHT CENTER SENSOR) 
    1. Disconnect the Z4 and Z3 sensor connectors.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITIONS

      Tester Connection Condition Specified Condition
      Z4-2 (BO) - Z3-1 (BI) Always Below 1 Ω
      Z4-4 (SO) - Z3-3 (SI) Always Below 1 Ω
      Z4-6 (EO) - Z3-5 (EI) Always Below 1 Ω
      Z4-2 (BO) - Body ground Always 10 kΩ or higher
      Z4-4 (SO) - Body ground Always 10 kΩ or higher
      Z4-6 (EO) - Body ground Always 10 kΩ or higher
      Fig 3: Identifying Z4 Rear Right Corner And Z3 Rear Right Center Sensor Connector Terminals
      G04951869Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to Next Step 

  5. CHECK HARNESS AND CONNECTOR (REAR RIGHT CENTER SENSOR - REAR LEFT CENTER SENSOR) 
    1. Disconnect the Z3 and Z2 sensor connectors.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITIONS

      Tester Connection Condition Specified Condition
      Z3-2 (BO) - Z2-1 (BI) Always Below 1 Ω
      Z3-4 (SO) - Z2-3 (SI) Always Below 1 Ω
      Z3-6 (EO) - Z2-5 (EI) Always Below 1 Ω
      Z3-2 (BO) - Body ground Always 10 kΩ or higher
      Z3-4 (SO) - Body ground Always 10 kΩ or higher
      Z3-6 (EO) - Body ground Always 10 kΩ or higher
      Fig 4: Identifying Z3 Rear Right Center And Z2 Rear Left Center Sensor Connector Terminals
      G04951870Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to Next Step 

  6. CHECK HARNESS AND CONNECTOR (REAR LEFT CENTER SENSOR - REAR LEFT CORNER SENSOR) 
    1. Disconnect the Z2 and Z1 sensor connectors.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITIONS

      Tester Connection Condition Specified Condition
      Z2-2 (BO) - Z1-1 (BI) Always Below 1 Ω
      Z2-4 (SO) - Z1-3 (SI) Always Below 1 Ω
      Z2-6 (EO) - Z1-5 (EI) Always Below 1 Ω
      Z2-2 (BO) - Body ground Always 10 kΩ or higher
      Z2-4 (SO) - Body ground Always 10 kΩ or higher
      Z2-6 (EO) - Body ground Always 10 kΩ or higher
      Fig 5: Identifying Z2 Rear Left Center And Z1 Rear Left Corner Sensor Connector Terminals
      G06192406Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to Next Step 

  7. CHECK DTC OUTPUT 
    1. Clear the DTCs (see DTC CHECK/CLEAR ).
    2. Check for DTCs (see DTC CHECK/CLEAR ).

      Result 

      DTC OUTPUT RESULT

      Result Proceed to
      DTC C1AED is output And, multi-information display indicates open circuit (Rear Left, Rear Center and Rear Right) A
      DTC C1AED is output And, multi-information display indicates open circuit (Rear Left and Rear Center) B
      No DTCs are output C

    B:  Go to step  12

    C: END 

    A: Go to Next Step 

  8. REPLACE NO. 1 ULTRASONIC SENSOR (REAR RIGHT CORNER SENSOR) 
    1. Replace the ultrasonic sensor (see REMOVAL ) with a normally functioning sensor.
    Fig 6: Identifying No. 1 Ultrasonic Sensor (Rear Right Corner Sensor)
    G04951833Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. CHECK DTC OUTPUT 
    1. Clear the DTCs (see DTC CHECK/CLEAR ).
    2. Check for DTCs (see DTC CHECK/CLEAR ).

      Result 

      DTC OUTPUT RESULT

      Result Proceed to
      DTC C1AED is output A
      DTC C1AED is output And, multi-information display indicates open circuit (Rear Left, Rear Center and Rear Right) B
      No DTC is output And, multi-information display indicates open circuit (Rear Left and Rear Center) C

    B:  Go to step  12

    C: END 

    A: Go to Next Step 

  10. REPLACE NO. 1 ULTRASONIC SENSOR (REAR LEFT CORNER SENSOR) 
    1. Replace the ultrasonic sensor (see REMOVAL ) with a normally functioning sensor.
    Fig 7: Identifying No. 1 Ultrasonic Sensor (Rear Left Corner Sensor)
    G04951833Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. CHECK DTC OUTPUT 
    1. Clear the DTCs (see DTC CHECK/CLEAR ).
    2. Check for DTCs (see DTC CHECK/CLEAR ).

      Result 

      DTC OUTPUT RESULT

      Result Proceed to
      DTC C1AED is output And, multi-information display indicates open circuit (Rear Left, Rear Center and Rear Right) (w/o Advanced parking guidance system) A
      DTC C1AED is output And, multi-information display indicates open circuit (Rear Left, Rear Center and Rear Right) (w/ Advanced parking guidance system) B
      DTC C1AED is output And, multi-information display indicates open circuit (Rear Left and Rear Center) C
      No DTC is output D

    B: REPLACE CLEARANCE WARNING ECU  (See REMOVAL )

    C: REPLACE PARKING ASSIST ECU  (See REMOVAL )

    D: END 

    A: Go to Next Step 

  12. REPLACE NO. 1 ULTRASONIC SENSOR (REAR RIGHT CENTER SENSOR) 
    1. Replace the ultrasonic sensor (see REMOVAL ) with a normally functioning sensor.
    Fig 8: Identifying No. 1 Ultrasonic Sensor (Rear Right Center Sensor)
    G04951833Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. CHECK DTC OUTPUT 
    1. Clear the DTCs (see DTC CHECK/CLEAR ).
    2. Check for DTCs (see DTC CHECK/CLEAR ).

      Result 

      DTC OUTPUT RESULT

      Result Proceed to
      DTC C1AED is output And, multi-information display indicates open circuit (Rear Left and Rear Center) A
      No DTC is output B

    B: END 

    A: Go to Next Step 

  14. REPLACE NO. 1 ULTRASONIC SENSOR (REAR LEFT CENTER SENSOR) 
    1. Replace the ultrasonic sensor (see REMOVAL ) with a normally functioning sensor.
    Fig 9: Identifying No. 1 Ultrasonic Sensor (Rear Left Center Sensor)
    G04951833Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  15. CHECK DTC OUTPUT 
    1. Clear the DTCs (see DTC CHECK/CLEAR ).
    2. Check for DTCs (see DTC CHECK/CLEAR ).

      Result 

      DTC OUTPUT RESULT

      Result Proceed to
      DTC C1AED is output And, multi-information display indicates open circuit (Rear Left, Rear Center and Rear Right) (w/o Advanced parking guidance system) A
      DTC C1AED is output And, multi-information display indicates open circuit (Rear Left, Rear Center and Rear Right) (w/ Advanced parking guidance system) B
      No DTC is output C

    B: REPLACE PARKING ASSIST ECU  (See REMOVAL )

    C: END 

    A: REPLACE CLEARANCE WARNING ECU  (See REMOVAL )

  16. CHECK PARKING ASSIST ECU 
    1. Reconnect the L91 ECU connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITIONS

      Tester Connection Condition Specified Condition
      L91-29 (CSG2) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFIED CONDITIONS

      Tester Connection Condition Specified Condition
      L91-28 (CSB2) - Body ground Engine switch on (IG) 7.2 to 8.8 V
    Fig 10: Identifying L91 Parking Assist ECU Connector Terminals
    G04951876Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE PARKING ASSIST ECU  (See REMOVAL )

    OK: Go to Next Step 

  17. CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - REAR RIGHT CORNER SENSOR) 
    1. Disconnect the L91 ECU connector.
    2. Disconnect the Z4 sensor connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITIONS

      Tester Connection Condition Specified Condition
      L91-28 (CSB2) - Z4-1 (BI) Always Below 1 Ω
      L91-30 (LIN2) - Z4-3 (SI) Always Below 1 Ω
      L91-29 (CSG2) - Z4-5 (EI) Always Below 1 Ω
      L91-28 (CSB2) - Body ground Always 10 kΩ or higher
      L91-30 (LIN2) - Body ground Always 10 kΩ or higher
      L91-29 (CSG2) - Body ground Always 10 kΩ or higher
      Fig 11: Identifying L91 Parking Assist ECU And Z4 Rear Right Corner Sensor Connector Terminals
      G04951877Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK:  Go to step  4

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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