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

WIRING DIAGRAM

A003YFJE11

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 A
      No DTC is output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

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


    1. Disconnect the A49 connector from the clearance warning ECU.

    2. Disconnect the U1 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
      A49-7 (BOR) - U1-1 (BI) Always Below 1 Ω
      A49-6 (SOR) - U1-3 (SI)
      A49-22 (E1) - U1-5 (EI)
      A49-7 (BOR) - Body ground 10 kΩ or higher
      A49-6 (SOR) - Body ground
      A49-22 (E1) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the U1 and U3 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
      U1-2 (BO) - U3-1 (BI) Always Below 1 Ω
      U1-4 (SO) - U3-3 (SI)
      U1-6 (EO) - U3-5 (EI)
      U1-2 (BO) - Body ground 10 kΩ or higher
      U1-4 (SO) - Body ground
      U1-6 (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. Disconnect the U3 and U4 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
      U3-2 (BO) - U4-1 (BI) Always Below 1 Ω
      U3-4 (SO) - U4-3 (SI)
      U3-6 (EO) - U4-5 (EI)
      U3-2 (BO) - Body ground 10 kΩ or higher
      U3-4 (SO) - Body ground
      U3-6 (EO) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the U4 and U2 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
      U4-2 (BO) - U2-1 (BI) Always Below 1 Ω
      U4-4 (SO) - U2-3 (SI)
      U4-6 (EO) - U2-5 (EI)
      U4-2 (BO) - Body ground 10 kΩ or higher
      U4-4 (SO) - Body ground
      U4-6 (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. A003Z4PE01
      Text in Illustration
      *a

      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)
      3 (SI) - 4 (SO) Below 1 Ω
      5 (EI) - 6 (EO)

    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. A003Z4PE01
      Text in Illustration
      *a

      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)
      3 (SI) - 4 (SO) Below 1 Ω
      5 (EI) - 6 (EO)

    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. A003Z4PE01
      Text in Illustration
      *a

      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)
      3 (SI) - 4 (SO) Below 1 Ω
      5 (EI) - 6 (EO)

    NG

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

    OK

  9. 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.

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