LEXUS PARKING ASSIST-SENSOR SYSTEM, Diagnostic DTC:C1AED

DTC Code DTC Name
C1AED Rear Sensor Communication Malfunction

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

  • Clearance warning ECU*1

  • Parking assist ECU*2

WIRING DIAGRAM

A01NH62E03

INSPECTION PROCEDURE

PROCEDURE


  1. 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

      (w/o Parking Assist Monitor System)

      		 A

      DTC C1AED is output

      (w/ Parking Assist Monitor System)

      		 B
      No DTC is output C

    B

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

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

  2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - REAR RIGHT SENSOR)


    1. A01NF46E14
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Clearance Warning ECU)
      *2

      Front view of wire harness connector

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

      Disconnect the F52 connector from the clearance warning ECU.

    2. Disconnect the X1 connector from the No. 1 ultrasonic sensor.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F52-7 (BOR) - X1-1 (BI) Always Below 1 Ω
      F52-24 (SOR) - X1-3 (SI)
      F52-18 (E2) - X1-5 (EI)
      F52-7 (BOR) - Body ground 10 kΩ or higher
      F52-24 (SOR) - Body ground
      F52-18 (E2) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01NGOLE18
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 1 Ultrasonic Sensor (Rear Right Sensor))
      *2

      Front view of wire harness connector

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

      Disconnect the X1 and X2 connectors from the No. 1 ultrasonic sensors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X1-2 (BO) - X2-1 (BI) Always Below 1 Ω
      X1-4 (SO) - X2-3 (SI)
      X1-6 (EO) - X2-5 (EI)
      X1-2 (BO) - Body ground 10 kΩ or higher
      X1-4 (SO) - Body ground
      X1-6 (EO) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01NGOLE19
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 1 Ultrasonic Sensor (Rear Right Center Sensor))
      *2

      Front view of wire harness connector

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

      Disconnect the X2 and X3 connectors from the No. 1 ultrasonic sensors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X2-2 (BO) - X3-1 (BI) Always Below 1 Ω
      X2-4 (SO) - X3-3 (SI)
      X2-6 (EO) - X3-5 (EI)
      X2-2 (BO) - Body ground 10 kΩ or higher
      X2-4 (SO) - Body ground
      X2-6 (EO) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01NGOLE20
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 1 Ultrasonic Sensor (Rear Left Center Sensor))
      *2

      Front view of wire harness connector

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

      Disconnect the X3 and X4 connectors from the No. 1 ultrasonic sensors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X3-2 (BO) - X4-1 (BI) Always Below 1 Ω
      X3-4 (SO) - X4-3 (SI)
      X3-6 (EO) - X4-5 (EI)
      X3-2 (BO) - Body ground 10 kΩ or higher
      X3-4 (SO) - Body ground
      X3-6 (EO) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK NO. 1 ULTRASONIC SENSOR (REAR RIGHT SENSOR)


    1. Remove the No. 1 ultrasonic sensor (rear right sensor) Click here.

    2. A01NEYFE15
      Text in Illustration
      *1

      Component without harness connected

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

      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

    NG

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

    OK

  7. CHECK NO. 1 ULTRASONIC SENSOR (REAR RIGHT CENTER SENSOR)


    1. Remove the No. 1 ultrasonic sensor (rear right center sensor) Click here.

    2. A01NEYFE17
      Text in Illustration
      *1

      Component without harness connected

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

      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

    NG

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

    OK

  8. CHECK NO. 1 ULTRASONIC SENSOR (REAR LEFT CENTER SENSOR)


    1. Remove the No. 1 ultrasonic sensor (rear left center sensor) Click here.

    2. A01NEYFE16
      Text in Illustration
      *1

      Component without harness connected

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

      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

    NG

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

    OK

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


    1. A01NHV1E07
      Text in Illustration
      *1

      No. 1 Ultrasonic Sensor

      (Rear Right Sensor)

      Replace the No. 1 ultrasonic sensor (rear right sensor) with a normally functioning sensor Click here.

      Tech Tips

      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.


    NEXT

  10. 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 DTC is output B

    B

    END (REAR RIGHT SENSOR WAS DEFECTIVE)

    A

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


    1. A01NHV1E07
      Text in Illustration
      *1

      No. 1 Ultrasonic Sensor

      (Rear Right Center Sensor)

      Replace the No. 1 ultrasonic sensor (rear right center sensor) with a normally functioning sensor Click here.

      Tech Tips

      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.


    NEXT

  12. 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 DTC is output B

    B

    END (REAR RIGHT CENTER SENSOR WAS DEFECTIVE)

    A

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


    1. A01NHV1E07
      Text in Illustration
      *1

      No. 1 Ultrasonic Sensor

      (Rear Left Center Sensor)

      Replace the No. 1 ultrasonic sensor (rear left center sensor) with a normally functioning sensor Click here.

      Tech Tips

      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.


    NEXT

  14. 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 DTC is output B

    B

    END (REAR LEFT CENTER SENSOR WAS DEFECTIVE)

    A

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


    1. A01NHV1E07
      Text in Illustration
      *1

      No. 1 Ultrasonic Sensor

      (Rear Left Sensor)

      Replace the No. 1 ultrasonic sensor (rear left sensor) with a normally functioning sensor Click here.

      Tech Tips

      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.


    NEXT

  16. 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 DTC is output B

    B

    END (REAR LEFT SENSOR WAS DEFECTIVE)

    A

    REPLACE CLEARANCE WARNING ECU Click here

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


    1. A01NDLYE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Parking Assist ECU)
      *2

      Front view of wire harness connector

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

      Disconnect the F55 connector from the parking assist ECU.

    2. Disconnect the X1 connector from the No. 1 ultrasonic sensor.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F55-7 (CSB2) - X1-1 (BI) Always Below 1 Ω
      F55-9 (LIN2) - X1-3 (SI)
      F55-8 (CSG2) - X1-5 (EI)
      F55-7 (CSB2) - Body ground 10 kΩ or higher
      F55-9 (LIN2) - Body ground
      F55-8 (CSG2) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01NGOLE21
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 1 Ultrasonic Sensor (Rear Right Sensor))
      *2

      Front view of wire harness connector

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

      Disconnect the X1 and X2 connectors from the No. 1 ultrasonic sensors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X1-2 (BO) - X2-1 (BI) Always Below 1 Ω
      X1-4 (SO) - X2-3 (SI)
      X1-6 (EO) - X2-5 (EI)
      X1-2 (BO) - Body ground 10 kΩ or higher
      X1-4 (SO) - Body ground
      X1-6 (EO) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01NGOLE22
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 1 Ultrasonic Sensor (Rear Right Center Sensor))
      *2

      Front view of wire harness connector

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

      Disconnect the X2 and X3 connectors from the No. 1 ultrasonic sensors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X2-2 (BO) - X3-1 (BI) Always Below 1 Ω
      X2-4 (SO) - X3-3 (SI)
      X2-6 (EO) - X3-5 (EI)
      X2-2 (BO) - Body ground 10 kΩ or higher
      X2-4 (SO) - Body ground
      X2-6 (EO) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01NGOLE23
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 1 Ultrasonic Sensor (Rear Left Center Sensor))
      *2

      Front view of wire harness connector

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

      Disconnect the X3 and X4 connectors from the No. 1 ultrasonic sensors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X3-2 (BO) - X4-1 (BI) Always Below 1 Ω
      X3-4 (SO) - X4-3 (SI)
      X3-6 (EO) - X4-5 (EI)
      X3-2 (BO) - Body ground 10 kΩ or higher
      X3-4 (SO) - Body ground
      X3-6 (EO) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  21. CHECK NO. 1 ULTRASONIC SENSOR (REAR RIGHT SENSOR)


    1. Remove the No. 1 ultrasonic sensor (rear right sensor) Click here.

    2. A01NEYFE18
      Text in Illustration
      *1

      Component without harness connected

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

      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

    NG

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

    OK

  22. CHECK NO. 1 ULTRASONIC SENSOR (REAR RIGHT CENTER SENSOR)


    1. Remove the No. 1 ultrasonic sensor (rear right center sensor) Click here.

    2. A01NEYFE20
      Text in Illustration
      *1

      Component without harness connected

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

      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

    NG

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

    OK

  23. CHECK NO. 1 ULTRASONIC SENSOR (REAR LEFT CENTER SENSOR)


    1. Remove the No. 1 ultrasonic sensor (rear left center sensor) Click here.

    2. A01NEYFE19
      Text in Illustration
      *1

      Component without harness connected

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

      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

    NG

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

    OK

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


    1. A01NHV1E07
      Text in Illustration
      *1

      No. 1 Ultrasonic Sensor

      (Rear Right Sensor)

      Replace the No. 1 ultrasonic sensor (rear right sensor) with a normally functioning sensor Click here.

      Tech Tips

      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.


    NEXT

  25. 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 DTC is output B

    B

    END (REAR RIGHT SENSOR WAS DEFECTIVE)

    A

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


    1. A01NHV1E07
      Text in Illustration
      *1

      No. 1 Ultrasonic Sensor

      (Rear Right Center Sensor)

      Replace the No. 1 ultrasonic sensor (rear right center sensor) with a normally functioning sensor Click here.

      Tech Tips

      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.


    NEXT

  27. 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 DTC is output B

    B

    END (REAR RIGHT CENTER SENSOR WAS DEFECTIVE)

    A

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


    1. A01NHV1E07
      Text in Illustration
      *1

      No. 1 Ultrasonic Sensor

      (Rear Left Center Sensor)

      Replace the No. 1 ultrasonic sensor (rear left center sensor) with a normally functioning sensor Click here.

      Tech Tips

      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.


    NEXT

  29. 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 DTC is output B

    B

    END (REAR LEFT CENTER SENSOR WAS DEFECTIVE)

    A

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


    1. A01NHV1E07
      Text in Illustration
      *1

      No. 1 Ultrasonic Sensor

      (Rear Left Sensor)

      Replace the No. 1 ultrasonic sensor (rear left sensor) with a normally functioning sensor Click here.

      Tech Tips

      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.


    NEXT

  31. 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 DTC is output B

    B

    END (REAR LEFT SENSOR WAS DEFECTIVE)

    A

    REPLACE PARKING ASSIST ECU Click here