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Home >> Lexus >> 2007 >> LS 460L >> 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. Delete the DTCs (see DTC CHECK / CLEAR  ).
    2. Recheck for DTCs (see DTC CHECK / CLEAR  ).

      Result 

      RESULT CHART

      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 
      Fig 1: Identifying Terminals Of L19 ECU Connector
      G04951867Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Reconnect the L19 ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      CLEARANCE WARNING ECU RESISTANCE

      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 

      CLEARANCE WARNING ECU VOLTAGE

      Tester Connection Switch Condition Specified Condition
      L19-7 (BOR) - Body ground Engine switch on (IG) 7.2 to 8.8 V

    NG: REPLACE CLEARANCE WARNING ECU (See  REMOVAL   ) 

    OK: GO TO NEXT STEP 

  3. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - REAR RIGHT CORNER SENSOR) 
      Fig 2: Identifying Terminals Of Z4 Sensor Connector
      G04951868Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 

      CLEARANCE WARNING ECU - REAR RIGHT CORNER SENSOR

      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

    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) 
      Fig 3: Identifying Terminals Of Z4 And Z3 Sensor Connectors
      G04951869Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the Z4 and Z3 sensor connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      REAR RIGHT CORNER SENSOR - REAR RIGHT CENTER SENSOR

      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 (El) 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

    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) 
      Fig 4: Identifying Terminals Of Z3 And Z2 Sensor Connectors
      G04951870Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the Z3 and Z2 sensor connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      REAR RIGHT CENTER SENSOR - REAR LEFT CENTER SENSOR

      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 (El) 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

    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) 
      Fig 5: Identifying Terminals Of Z2 And Z1 Sensor Connectors
      G04951871Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the Z2 and Z1 sensor connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      REAR LEFT CENTER SENSOR - REAR LEFT CORNER SENSOR

      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

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  7. CHECK DTC OUTPUT 
    1. Delete the DTCs (see DTC CHECK / CLEAR  ).
    2. Recheck for DTCs (see DTC CHECK / CLEAR  ).

      Result 

      RESULT CHART

      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
      G04951833Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. CHECK DTC OUTPUT 
    1. Delete the DTCs (see DTC CHECK / CLEAR  ).
    2. Recheck for DTCs (see DTC CHECK / CLEAR  ).

      Result 

      RESULT CHART

      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
      G04951833Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. CHECK DTC OUTPUT 
    1. Delete the DTCs (see DTC CHECK / CLEAR  ).
    2. Recheck for DTCs (see DTC CHECK / CLEAR  ).

      Result 

      RESULT CHART

      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
      G04951833Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. CHECK DTC OUTPUT 
    1. Delete the DTCs (see DTC CHECK / CLEAR  ).
    2. Recheck for DTCs (see DTC CHECK / CLEAR  ).

      Result 

      RESULT CHART

      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
      G04951833Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  15. CHECK DTC OUTPUT 
    1. Delete the DTCs (see DTC CHECK / CLEAR  ).
    2. Recheck for DTCs (see DTC CHECK / CLEAR  ).

      Result 

      RESULT CHART

      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 
      Fig 10: Identifying Terminals Of L91 ECU Connector
      G04951876Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Reconnect the L91 ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      PARKING ASSIST ECU RESISTANCE

      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 

      PARKING ASSIST ECU VOLTAGE

      Tester Connection Switch Condition Specified Condition
      L91-28(CSB2)-Body ground Engine switch on (IG) 7.2 to 8.8 V

    NG: REPLACE PARKING ASSIST ECU (See  REMOVAL   ) 

    OK: GO TO NEXT STEP 

  17. CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - REAR RIGHT CORNER SENSOR) 
      Fig 11: Identifying Terminals Of L91 ECU Connector
      G04951877Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 

      PARKING ASSIST ECU - REAR RIGHT CORNER SENSOR

      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 (El) 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

    OK: Go to step   4 

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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