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Home >> Toyota >> 2020 >> Corolla L >> Repair and Diagnosis >> External Pages >> Different car >> Section 248 (Intuitive Parking Assist System - Diagnostic Codes, Circuit Tests & Symptom Tests) >> Intuitive Parking Assist System >> DTC C1AE2-87: Ultrasonic Sensor (Front Left Center) Missing Message [09/2024 - ] >> Procedure

DTC C1AE2-87: Ultrasonic Sensor (Front Left Center) Missing Message [09/2024 - ]: Procedure

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  1. CHECK DTC 
    1. If DTC C1AE1-96 is output, perform troubleshooting for DTC C1AE1-96 first.

      Body Electrical > Clearance Warning > Trouble Codes 

      Result

      Result Proceed to
      C1AE1-96 is not output A
      C1AE1-96 is output B

    Result: 

    B 

    GO TO C1AE1-96 

    Refer to DTC C1AE1-96: Ultrasonic Sensor (Front Left Corner) Component Internal Failure [08/2023 - ] 

    Result: 

    A 

    See step  2

  2. VEHICLE CONDITION AND WORK DETAILS CHECK 
    1. Check the vehicle condition and work details.

      Result

      Result Proceed to
      The clearance warning ECU assembly or ultrasonic sensor has not been replaced A
      The clearance warning ECU assembly or ultrasonic sensor has been replaced B

    Result: 

    B 

    GO TO CALIBRATION 

    Refer to CALIBRATION [09/2024 - ]

    Result: 

    A 

    See step  3

  3. CHECK CONNECTOR CONNECTION CONDITION (ULTRASONIC SENSOR) 
    1. Check that the connector is properly connected to the front corner ultrasonic sensor and front center ultrasonic sensor.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. CHECK FOR DTC 
    1. According to the display on the GTS, check for DTCs.

      Body Electrical > Clearance Warning > Trouble Codes 

    2. According to the display on the GTS, clear the DTCs.

      Body Electrical > Clearance Warning > Clear DTCs 

    3. Recheck for DTCs.

      Body Electrical > Clearance Warning > Trouble Codes 

      Result

      Result Proceed to
      C1AE2-87 is not output A
      C1AE2-87 is output B

    Result: 

    A 

    END (CONNECTOR CONNECTION MALFUNCTION) 

    Result: 

    B 

    See step  5

  5. CHECK CONNECTOR CONNECTION CONDITION (CLEARANCE WARNING ECU ASSEMBLY) 
    1. Check that the connector is properly connected to the clearance warning ECU assembly.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  6

  6. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Clearance Warning > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  7

  7. CHECK DTC OUTPUT 
    1. Check for DTCs.

      Body Electrical > Clearance Warning > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      C1AE1-87, C1AE2-87, C1AE3-87 and C1AE4-87 are output B
      C1AE2-87, C1AE3-87 and C1AE4-87 are output C
      C1AE3-87 and C1AE4-87 are output D
      C1AE4-87 is output E
      C1AE2-87 is output F

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ]

    Result: 

    B 

    GO TO CORRESPONDING FLOWCHART (INTUITIVE PARKING ASSIST SYSTEM (C1AE1-87)) 

    Refer to DTC C1AE1-87: Ultrasonic Sensor (Front Left Corner) Missing Message [09/2024 - ] 

    Result: 

    D 

    GO TO CORRESPONDING FLOWCHART (INTUITIVE PARKING ASSIST SYSTEM (C1AE3-87)) 

    Refer to DTC C1AE3-87: Ultrasonic Sensor (Front Right Center) Missing Message [09/2024 - ] 

    Result: 

    E 

    GO TO CORRESPONDING FLOWCHART (INTUITIVE PARKING ASSIST SYSTEM (C1AE4-87)) 

    Refer to DTC C1AE4-87: Ultrasonic Sensor (Front Right Corner) Missing Message [09/2024 - ] 

    Result: 

    F 

    See step  9

    Result: 

    C 

    See step  8

  8. CHECK WIRE HARNESS AND CONNECTOR (FRONT CENTER ULTRASONIC SENSOR LH - FRONT CORNER ULTRASONIC SENSOR LH) 

    Pre-procedure1

    1. Disconnect the B5 front corner ultrasonic sensor LH connector.
    2. Disconnect the B6 front center ultrasonic sensor LH connector.

      Procedure1

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B5-1 (BO) - B6-4 (BI) Always Below 1 Ω
      B5-2 (SO) - B6-5 (SI) Always Below 1 Ω
      B5-3 (EO) - B6-6 (EI) Always Below 1 Ω
      B5-1 (BO) or B6-4 (BI) - Body ground Always 10 kΩ or higher
      B5-2 (SO) or B6-5 (SI) - Body ground Always 10 kΩ or higher
      B5-3 (EO) or B6-6 (EI) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. REPLACE FRONT CENTER ULTRASONIC SENSOR LH 
    1. Replace the front center ultrasonic sensor LH with a new or normally functioning one.

      HINT: 

      • Refer to REMOVAL [09/2024 - ]
      • To check if the ultrasonic sensor is functioning correctly, replace it with another ultrasonic sensor.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  10

  10. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Clearance Warning > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  11

  11. CHECK FOR DTC 
    1. Check for DTCs.

      Body Electrical > Clearance Warning > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      C1AE2-87 is output B

    Result: 

    A 

    END (FRONT CENTER ULTRASONIC SENSOR LH WAS DEFECTIVE) 

    Result: 

    B 

    REPLACE CLEARANCE WARNING ECU ASSEMBLY 

    Refer to REMOVAL [09/2024 - ]

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