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Home >> Lexus >> 2018 >> RX 450h Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Collision/Avoidance >> Intuitive Parking Assist System (W/ Intelligent Clearance Sonar System) (Diagnostic Codes & Circuit Tests) >> INTUITIVE PARKING ASSIST SYSTEM (w/ Intelligent Clearance Sonar System) >> DTC C1AEC: Front Sensor Communication Malfunction [08/2019 - ] >> Procedure

DTC C1AEC: Front Sensor Communication Malfunction [08/2019 - ]: Procedure

  1. INITIALIZE FRONT CENTER ULTRASONIC SENSOR AND FRONT CORNER ULTRASONIC SENSOR 
    1. Initialize the front center ultrasonic sensor and front corner ultrasonic sensor.

      Refer to CALIBRATION [08/2019 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK DTC OUTPUT (C1AEC) 
    1. Check for DTCs.

      Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes 

    2. Clear the DTCs.

      Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Clear DTCs 

    3. Recheck for DTCs.

      Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes 

      Result

      Result Proceed to
      DTC C1AEC is output A
      No DTCs are output B

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2019 - 07/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2020 - ] 

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - FRONT CORNER ULTRASONIC SENSOR LH) 
    1. Disconnect the J38 clearance warning ECU assembly connector.
    2. Disconnect the B7 front corner ultrasonic sensor LH connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      J38-4 (BOF) - B7-4 (BI) Always Below 1 Ω
      J38-8 (SOF) - B7-5 (SI) Always Below 1 Ω
      J38-6 (E5) - B7-6 (EI) Always Below 1 Ω
      J38-4 (BOF) or B7-4 (BI) - Body ground Always 10 kΩ or higher
      J38-8 (SOF) or B7-5 (SI) - Body ground Always 10 kΩ or higher
      J38-6 (E5) or B7-6 (EI) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (FRONT CORNER ULTRASONIC SENSOR LH - FRONT CENTER ULTRASONIC SENSOR LH) 
    1. Disconnect the B8 front center ultrasonic sensor LH connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B7-1 (BO) - B8-4 (BI) Always Below 1 Ω
      B7-2 (SO) - B8-5 (SI) Always Below 1 Ω
      B7-3 (EO) - B8-6 (EI) Always Below 1 Ω
      B7-1 (BO) or B8-4 (BI) - Body ground Always 10 kΩ or higher
      B7-2 (SO) or B8-5 (SI) - Body ground Always 10 kΩ or higher
      B7-3 (EO) or B8-6 (EI) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (FRONT CENTER ULTRASONIC SENSOR LH - FRONT CENTER ULTRASONIC SENSOR RH) 
    1. Disconnect the B9 front center ultrasonic sensor RH connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B8-1 (BO) - B9-4 (BI) Always Below 1 Ω
      B8-2 (SO) - B9-5 (SI) Always Below 1 Ω
      B8-3 (EO) - B9-6 (EI) Always Below 1 Ω
      B8-1 (BO) or B9-4 (BI) - Body ground Always 10 kΩ or higher
      B8-2 (SO) or B9-5 (SI) - Body ground Always 10 kΩ or higher
      B8-3 (EO) or B9-6 (EI) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (FRONT CENTER ULTRASONIC SENSOR RH - FRONT CORNER ULTRASONIC SENSOR RH) 
    1. Disconnect the B10 front corner ultrasonic sensor RH connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B9-1 (BO) - B10-4 (BI) Always Below 1 Ω
      B9-2 (SO) - B10-5 (SI) Always Below 1 Ω
      B9-3 (EO) - B10-6 (EI) Always Below 1 Ω
      B9-1 (BO) or B10-4 (BI) - Body ground Always 10 kΩ or higher
      B9-2 (SO) or B10-5 (SI) - Body ground Always 10 kΩ or higher
      B9-3 (EO) or B10-6 (EI) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. INSPECT FRONT CORNER ULTRASONIC SENSOR LH 
    1. Measure the resistance according to the value (s) in the table below.
      GTY565900Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Front Corner Ultrasonic Sensor LH)

      Standard Resistance

      Tester Connection Condition Specified Condition
      4 (BI) - 6 (EI) Always 10 kΩ or higher
      4 (BI) - 1 (BO) Always Below 1 Ω
      5 (SI) - 2 (SO) Always Below 30 Ω
      6 (EI) - 3 (EO) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FRONT CORNER ULTRASONIC SENSOR LH. Refer to  REMOVAL [08/2019 - ] 

    Result: 

    OK 

    See step  8

  8. INSPECT FRONT CENTER ULTRASONIC SENSOR LH 
    1. Measure the resistance according to the value (s) in the table below.
      GTY565900Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Front Center Ultrasonic Sensor LH)

      Standard Resistance

      Tester Connection Condition Specified Condition
      4 (BI) - 6 (EI) Always 10 kΩ or higher
      4 (BI) - 1 (BO) Always Below 1 Ω
      5 (SI) - 2 (SO) Always Below 30 Ω
      6 (EI) - 3 (EO) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FRONT CENTER ULTRASONIC SENSOR LH. Refer to  REMOVAL [08/2019 - ] 

    Result: 

    OK 

    See step  9

  9. INSPECT FRONT CENTER ULTRASONIC SENSOR RH 
    1. Measure the resistance according to the value (s) in the table below.
      GTY565900Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Front Center Ultrasonic Sensor RH)

      Standard Resistance

      Tester Connection Condition Specified Condition
      4 (BI) - 6 (EI) Always 10 kΩ or higher
      4 (BI) - 1 (BO) Always Below 1 Ω
      5 (SI) - 2 (SO) Always Below 30 Ω
      6 (EI) - 3 (EO) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FRONT CENTER ULTRASONIC SENSOR RH. Refer to  REMOVAL [08/2019 - ] 

    Result: 

    OK 

    See step  10

  10. INSPECT FRONT CORNER ULTRASONIC SENSOR RH 
    1. Measure the resistance according to the value (s) in the table below.
      GTY963834Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Front Corner Ultrasonic Sensor RH)

      Standard Resistance

      Tester Connection Condition Specified Condition
      4 (BI) - 6 (EI) Always 10 kΩ or higher
      4 (BI) - 1 Always Below 1 Ω
      5 (SI) - 2 Always Below 30 Ω
      6 (EI) - 3 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FRONT CORNER ULTRASONIC SENSOR RH. Refer to  REMOVAL [08/2019 - ] 

    Result: 

    OK 

    See step  11

  11. REPLACE FRONT CORNER ULTRASONIC SENSOR LH 

    See step  2

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  12

  12. CHECK DTC OUTPUT (C1AEC) 
    1. Clear the DTCs.

      Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Clear DTCs 

    2. Check for DTCs.

      Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes 

      Result

      Result Proceed to
      DTC C1AEC is output A
      No DTCs are output B

    Result: 

    B 

    END (FRONT LEFT SENSOR WAS DEFECTIVE) 

    Result: 

    A 

    See step  13

  13. REPLACE FRONT CENTER ULTRASONIC SENSOR LH 

    See step  2

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  14

  14. CHECK DTC OUTPUT (C1AEC) 
    1. Clear the DTCs.

      Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Clear DTCs 

    2. Check for DTCs.

      Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes 

      Result

      Result Proceed to
      DTC C1AEC is output A
      No DTCs are output B

    Result: 

    B 

    END (FRONT LEFT CENTER SENSOR WAS DEFECTIVE) 

    Result: 

    A 

    See step  15

  15. REPLACE FRONT CENTER ULTRASONIC SENSOR RH 

    See step  2

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  16

  16. CHECK DTC OUTPUT (C1AEC) 
    1. Clear the DTCs.

      Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Clear DTCs 

    2. Check for DTCs.

      Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes 

      Result

      Result Proceed to
      DTC C1AEC is output A
      No DTCs are output B

    Result: 

    B 

    END (FRONT RIGHT CENTER SENSOR WAS DEFECTIVE) 

    Result: 

    A 

    See step  17

  17. REPLACE FRONT CORNER ULTRASONIC SENSOR RH 

    See step  2

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  18

  18. CHECK DTC OUTPUT (C1AEC) 
    1. Clear the DTCs.

      Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Clear DTCs 

    2. Check for DTCs.

      Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes 

      Result

      Result Proceed to
      DTC C1AEC is output A
      No DTCs are output B

    Result: 

    A 

    REPLACE CLEARANCE WARNING ECU ASSEMBLY. Refer to  REMOVAL [08/2019 - ] 

    Result: 

    B 

    END (FRONT RIGHT SENSOR WAS DEFECTIVE) 

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