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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 214 (Parking Support Alert System (Hybrid) - Diagnostic Codes & Circuit Tests) >> PARKING SUPPORT ALERT SYSTEM (for HV Model) >> DTC C1AEC: Front Sensor Communication Malfunction [06/2018 - 09/2022] >> Procedure

DTC C1AEC: Front Sensor Communication Malfunction [06/2018 - 09/2022]: Procedure

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  1. INITIALIZE FRONT CENTER ULTRASONIC SENSOR AND FRONT CORNER ULTRASONIC SENSOR 
    1. Initialize the front center ultrasonic sensor and front corner ultrasonic sensor.
      1. w/o Parking Support Brake System: Refer to CALIBRATION [06/2018 - 08/2021] , or refer to CALIBRATION [08/2021 - 09/2022]
      2. w/ Parking Support Brake System: Refer to CALIBRATION [06/2018 - 08/2021] , or refer to CALIBRATION [08/2021 - 09/2022]

      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 [06/2018 - ] 

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - FRONT CORNER ULTRASONIC SENSOR RH) 
    1. Disconnect the N41 clearance warning ECU assembly connector.
    2. Disconnect the B1 front corner ultrasonic sensor RH.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      N41-4 (BOF) - B1-4 (BI) Always Below 1 Ω
      N41-8 (SOF) - B1-5 (SI) Always Below 1 Ω
      N41-6 (E5) - B1-6 (EI) Always Below 1 Ω
      N41-4 (BOF) or B1-4 (BI) - Body ground Always 10 kΩ or higher
      N41-8 (SOF) or B1-5 (SI) - Body ground Always 10 kΩ or higher
      N41-6 (E5) or B1-6 (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 RH - FRONT CENTER ULTRASONIC SENSOR RH) 
    1. Disconnect the B2 front center ultrasonic sensor RH.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B1-1 (BO) - B2-4 (BI) Always Below 1 Ω
      B1-2 (SO) - B2-5 (SI) Always Below 1 Ω
      B1-3 (EO) - B2-6 (EI) Always Below 1 Ω
      B1-1 (BO) or B2-4 (BI) - Body ground Always 10 kΩ or higher
      B1-2 (SO) or B2-5 (SI) - Body ground Always 10 kΩ or higher
      B1-3 (EO) or B2-6 (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 RH - FRONT CENTER ULTRASONIC SENSOR LH) 
    1. Disconnect the B3 front center ultrasonic sensor LH.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B2-1 (BO) - B3-4 (BI) Always Below 1 Ω
      B2-2 (SO) - B3-5 (SI) Always Below 1 Ω
      B2-3 (EO) - B3-6 (EI) Always Below 1 Ω
      B2-1 (BO) or B3-4 (BI) - Body ground Always 10 kΩ or higher
      B2-2 (SO) or B3-5 (SI) - Body ground Always 10 kΩ or higher
      B2-3 (EO) or B3-6 (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 LH - FRONT CORNER ULTRASONIC SENSOR LH) 
    1. Disconnect the B4 front corner ultrasonic sensor LH.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B3-1 (BO) - B4-4 (BI) Always Below 1 Ω
      B3-2 (SO) - B4-5 (SI) Always Below 1 Ω
      B3-3 (EO) - B4-6 (EI) Always Below 1 Ω
      B3-1 (BO) or B4-4 (BI) - Body ground Always 10 kΩ or higher
      B3-2 (SO) or B4-5 (SI) - Body ground Always 10 kΩ or higher
      B3-3 (EO) or B4-6 (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 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 Corner 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 CORNER ULTRASONIC SENSOR RH. Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022] 

    Result: 

    OK 

    See step  8

  8. 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 [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022] 

    Result: 

    OK 

    See step  9

  9. 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 [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022] 

    Result: 

    OK 

    See step  10

  10. INSPECT FRONT CORNER ULTRASONIC SENSOR LH 
    1. Measure the resistance according to the value(s) in the table below.
      GTY760556Courtesy 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 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 LH. Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022] 

    Result: 

    OK 

    See step  11

  11. REPLACE FRONT CORNER ULTRASONIC SENSOR RH 

    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 CORNER ULTRASONIC SENSOR RH WAS DEFECTIVE) 

    Result: 

    A 

    See step  13

  13. REPLACE FRONT CENTER ULTRASONIC SENSOR RH 

    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 CENTER ULTRASONIC SENSOR RH WAS DEFECTIVE) 

    Result: 

    A 

    See step  15

  15. REPLACE FRONT CENTER ULTRASONIC SENSOR LH 

    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 CENTER ULTRASONIC SENSOR LH WAS DEFECTIVE) 

    Result: 

    A 

    See step  17

  17. REPLACE FRONT CORNER ULTRASONIC SENSOR LH 

    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 [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022] 

    Result: 

    B 

    END (FRONT CORNER ULTRASONIC SENSOR LH WAS DEFECTIVE) 

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