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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Intuitive Parking Assist System (W/O Parking Support Brake System) - Diagnostic Codes & Circuit Tests >> INTUITIVE PARKING ASSIST SYSTEM (w/o Parking Support Brake System) >> DTC C1AE7-87: Ultrasonic Sensor (Rear Left Center) Missing Message [12/2019 - 11/2023] >> Procedure

DTC C1AE7-87: Ultrasonic Sensor (Rear Left Center) Missing Message [12/2019 - 11/2023]: Procedure

  1. 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 [12/2019 - 11/2023] 

    Result: 

    A 

    See step  2

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

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  3

  3. 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
      C1AE7-87 is not output A
      C1AE7-87 is output B

    Result: 

    A 

    END (CONNECTOR CONNECTION MALFUNCTION) 

    Result: 

    B 

    See step  4

  4. 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  5

  5. 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 

      DTC OUTPUT COMBINATION:

      Symptoms DTC Detection
      C1AE9-87 C1AE8-87 C1AE7-87 C1AE6-87
      Symptom 1 Not output Not output Not output Not output
      Symptom 2 Output Output Output Output
      Symptom 3 Not output Output Output Output
      Symptom 4 Not output Not output Output Output
      Symptom 5 Not output Not output Not output Output
      Symptom 6 Not output Not output Output Not output

      Result

      Result Proceed to
      Listed under symptom 1 in combination table A
      Listed under symptom 2 in combination table B
      Listed under symptom 3 in combination table C
      Listed under symptom 4 in combination table D
      Listed under symptom 5 in combination table E
      Listed under symptom 6 in combination table F

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

    Result: 

    B 

    GO TO CORRESPONDING FLOWCHART (INTUITIVE PARKING ASSIST SYSTEM (C1AE9-87)). Refer to  DTC C1AE9-87: Ultrasonic Sensor (Rear Right Corner) Missing Message [12/2019 - 11/2023]  

    Result: 

    C 

    GO TO CORRESPONDING FLOWCHART (INTUITIVE PARKING ASSIST SYSTEM (C1AE8-87)). Refer to  DTC C1AE8-87: Ultrasonic Sensor (Rear Right Center) Missing Message [12/2019 - 11/2023]  

    Result: 

    E 

    GO TO CORRESPONDING FLOWCHART (INTUITIVE PARKING ASSIST SYSTEM [C1AE6-87]). Refer to  DTC C1AE6-87: Ultrasonic Sensor (Rear Left Corner) Missing Message [12/2019 - 11/2023]  

    Result: 

    F 

    See step  7

    Result: 

    D 

    See step  6

  6. CHECK WIRE HARNESS AND CONNECTOR (REAR CENTER ULTRASONIC SENSOR RH - REAR CENTER ULTRASONIC SENSOR LH) 
    1. Disconnect the V3 rear center ultrasonic sensor RH connector.
    2. Disconnect the V2 rear center ultrasonic sensor LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      V3-1 (BO) - V2-4 (BI) Always Below 1 Ω
      V3-2 (SO) - V2-5 (SI) Always Below 1 Ω
      V3-3 (EO) - V2-6 (EI) Always Below 1 Ω
      V3-1 (BO) or V2-4 (BI) - Body ground Always 10 kΩ or higher
      V3-2 (SO) or V2-5 (SI) - Body ground Always 10 kΩ or higher
      V3-3 (EO) or V2-6 (EI) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. REPLACE REAR CENTER ULTRASONIC SENSOR LH 
    1. Replace the rear center ultrasonic sensor LH with a known good one.

      Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

      HINT: 

      All of the sensors are interchangeable. To confirm whether a sensor is functioning normally, switch it with a known good sensor from the other end of the vehicle.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  8

  8. 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
      No DTC is output A
      "C1AE7-87" is output B

    Result: 

    A 

    END (REAR CENTER ULTRASONIC SENSOR LH WAS DEFECTIVE) 

    Result: 

    B 

    REPLACE CLEARANCE WARNING ECU ASSEMBLY. Refer to  REMOVAL [12/2019 - 11/2023] 

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