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LEXUS PARKING ASSIST-SENSOR SYSTEM (w/ Side Monitor System), Diagnostic DTC:C1AED

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DTC Code DTC Name
C1AED Rear Sensor Communication Malfunction
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DESCRIPTION

This DTC is stored when there is an open or short circuit in the communication line between the rear sensors and the ECU, or when there is a malfunction in a rear sensor.

DTC No. DTC Detection Condition Trouble Area
C1AED An open or short circuit in the communication line between the rear sensors and ECU or a malfunction in a rear sensor during initialization mode after the power switch is turned on (IG).

  • Rear ultrasonic sensor circuit

  • Parking assist ECU
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

  • If DTCs are output after repairs, turn the power switch on (IG) and turn the LEXUS parking assist-sensor system on. Then clear the DTCs (Click here).

  • Depending on the parts that are replaced or operations that are performed during vehicle inspection or maintenance, calibration of other systems may be needed (Click here).

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PROCEDURE


  1. Click here

    CHECK DTC OUTPUT (C1AED)


    1. Check for DTCs (Click here).

    2. Clear the DTCs (Click here).

    3. Recheck for DTCs (Click here).

      Result
      Result Proceed to
      DTC C1AED is output A
      No DTCs are output B

  2. Click here

    CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - REAR RIGHT SENSOR)


    1. Disconnect the F111 parking assist ECU connector.

    2. Disconnect the X5 No. 1 ultrasonic sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F111-20 (CSB2) - X5-1 (BI) Always Below 1 Ω
      F111-3 (LIN2) - X5-3 (SI) Always Below 1 Ω
      F111-4 (CSG2) - X5-5 (EI) Always Below 1 Ω
      F111-20 (CSB2) - Body ground Always 10 kΩ or higher
      F111-3 (LIN2) - Body ground Always 10 kΩ or higher
      F111-4 (CSG2) - Body ground Always 10 kΩ or higher

  3. Click here

    CHECK HARNESS AND CONNECTOR (REAR RIGHT SENSOR - REAR RIGHT CENTER SENSOR)


    1. Disconnect the X6 No. 1 ultrasonic sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X5-2 (BO) - X6-1 (BI) Always Below 1 Ω
      X5-4 (SO) - X6-3 (SI) Always Below 1 Ω
      X5-6 (EO) - X6-5 (EI) Always Below 1 Ω
      X5-2 (BO) - Body ground Always 10 kΩ or higher
      X5-4 (SO) - Body ground Always 10 kΩ or higher
      X5-6 (EO) - Body ground Always 10 kΩ or higher

  4. Click here

    CHECK HARNESS AND CONNECTOR (REAR RIGHT CENTER SENSOR - REAR LEFT CENTER SENSOR)


    1. Disconnect the X7 No. 1 ultrasonic sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X6-2 (BO) - X7-1 (BI) Always Below 1 Ω
      X6-4 (SO) - X7-3 (SI) Always Below 1 Ω
      X6-6 (EO) - X7-5 (EI) Always Below 1 Ω
      X6-2 (BO) - Body ground Always 10 kΩ or higher
      X6-4 (SO) - Body ground Always 10 kΩ or higher
      X6-6 (EO) - Body ground Always 10 kΩ or higher

  5. Click here

    CHECK HARNESS AND CONNECTOR (REAR LEFT CENTER SENSOR - REAR LEFT SENSOR)


    1. Disconnect the X8 No. 1 ultrasonic sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X7-2 (BO) - X8-1 (BI) Always Below 1 Ω
      X7-4 (SO) - X8-3 (SI) Always Below 1 Ω
      X7-6 (EO) - X8-5 (EI) Always Below 1 Ω
      X7-2 (BO) - Body ground Always 10 kΩ or higher
      X7-4 (SO) - Body ground Always 10 kΩ or higher
      X7-6 (EO) - Body ground Always 10 kΩ or higher

  6. Click here

    INSPECT NO. 1 ULTRASONIC SENSOR (REAR RIGHT SENSOR)


    1. A01NNE1E01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (BI) - 5 (EI) Always 10 kΩ or higher
      1 (BI) - 2 (BO) Always 10 kΩ or higher
      3 (SI) - 4 (SO) Always Below 1 Ω
      5 (EI) - 6 (EO) Always Below 1 Ω
      Table 1. Text in Illustration
      *a

      Component without harness connected

      (No. 1 Ultrasonic Sensor (Rear Right Sensor))

  7. Click here

    INSPECT NO. 1 ULTRASONIC SENSOR (REAR RIGHT CENTER SENSOR)


    1. A01NNE1E01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (BI) - 5 (EI) Always 10 kΩ or higher
      1 (BI) - 2 (BO) Always 10 kΩ or higher
      3 (SI) - 4 (SO) Always Below 1 Ω
      5 (EI) - 6 (EO) Always Below 1 Ω
      Table 2. Text in Illustration
      *a

      Component without harness connected

      (No. 1 Ultrasonic Sensor (Rear Right Center Sensor))

  8. Click here

    INSPECT NO. 1 ULTRASONIC SENSOR (REAR LEFT CENTER SENSOR)


    1. A01NNE1E01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (BI) - 5 (EI) Always 10 kΩ or higher
      1 (BI) - 2 (BO) Always 10 kΩ or higher
      3 (SI) - 4 (SO) Always Below 1 Ω
      5 (EI) - 6 (EO) Always Below 1 Ω
      Table 3. Text in Illustration
      *a

      Component without harness connected

      (No. 1 Ultrasonic Sensor (Rear Left Center Sensor))

  9. Click here

    REPLACE NO. 1 ULTRASONIC SENSOR (REAR LEFT SENSOR)


    1. Replace the No. 1 ultrasonic sensor (rear left sensor) with a known good one (Click here).

      Tip:

      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.


  10. Click here

    CHECK DTC OUTPUT (C1AED)


    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      Result
      Result Proceed to
      DTC C1AED is output A
      No DTCs are output B

  11. Click here

    REPLACE NO. 1 ULTRASONIC SENSOR (REAR LEFT CENTER SENSOR)


    1. Replace the No. 1 ultrasonic sensor (rear left center sensor) with a known good one (Click here).

      Tip:

      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.


  12. Click here

    CHECK DTC OUTPUT (C1AED)


    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      Result
      Result Proceed to
      DTC C1AED is output A
      No DTCs are output B

  13. Click here

    REPLACE NO. 1 ULTRASONIC SENSOR (REAR RIGHT CENTER SENSOR)


    1. Replace the No. 1 ultrasonic sensor (rear right center sensor) with a known good one (Click here).

      Tip:

      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.


  14. Click here

    CHECK DTC OUTPUT (C1AED)


    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      Result
      Result Proceed to
      DTC C1AED is output A
      No DTCs are output B

  15. Click here

    REPLACE NO. 1 ULTRASONIC SENSOR (REAR RIGHT SENSOR)


    1. Replace the No. 1 ultrasonic sensor (rear right sensor) with a known good one (Click here).

      Tip:

      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.


  16. Click here

    CHECK DTC OUTPUT (C1AED)


    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      Result
      Result Proceed to
      DTC C1AED is output A
      No DTCs are output B

  17. Click here

    USE SIMULATION METHOD TO CHECKClick here

  18. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  19. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  20. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  21. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  22. Click here

    REPLACE NO. 1 ULTRASONIC SENSOR (REAR RIGHT SENSOR)Click here

  23. Click here

    REPLACE NO. 1 ULTRASONIC SENSOR (REAR RIGHT CENTER SENSOR)Click here

  24. Click here

    REPLACE NO. 1 ULTRASONIC SENSOR (REAR LEFT CENTER SENSOR)Click here

  25. Click here

    END

  26. Click here

    END

  27. Click here

    END

  28. Click here

    END

  29. Click here

    REPLACE PARKING ASSIST ECUClick here