TOYOTA 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 engine switch is turned on (IG).

  • Rear ultrasonic sensor circuit

  • Clearance warning ECU assembly

WIRING DIAGRAM

A01CEZ8E01

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 DTCs are output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

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


    1. Disconnect the F2 connector from the clearance warning ECU assembly.

    2. Disconnect the T1 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
      F2-7 (BOR) - T1-1 (BI) Always Below 1 Ω
      F2-6 (SOR) - T1-3 (SI) Always Below 1 Ω
      F2-22 (E2) - T1-5 (EI) Always Below 1 Ω
      F2-7 (BOR) - Body ground Always 10 kΩ or higher
      F2-6 (SOR) - Body ground Always 10 kΩ or higher
      F2-22 (E2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the T2 connector from the No. 1 ultrasonic sensor.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T1-2 (BO) - T2-1 (BI) Always Below 1 Ω
      T1-4 (SO) - T2-3 (SI) Always Below 1 Ω
      T1-6 (EO) - T2-5 (EI) Always Below 1 Ω
      T1-2 (BO) - Body ground Always 10 kΩ or higher
      T1-4 (SO) - Body ground Always 10 kΩ or higher
      T1-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the T3 connector from the No. 1 ultrasonic sensor.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T2-2 (BO) - T3-1 (BI) Always Below 1 Ω
      T2-4 (SO) - T3-3 (SI) Always Below 1 Ω
      T2-6 (EO) - T3-5 (EI) Always Below 1 Ω
      T2-2 (BO) - Body ground Always 10 kΩ or higher
      T2-4 (SO) - Body ground Always 10 kΩ or higher
      T2-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the T4 connector from the No. 1 ultrasonic sensor.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T3-2 (BO) - T4-1 (BI) Always Below 1 Ω
      T3-4 (SO) - T4-3 (SI) Always Below 1 Ω
      T3-6 (EO) - T4-5 (EI) Always Below 1 Ω
      T3-2 (BO) - Body ground Always 10 kΩ or higher
      T3-4 (SO) - Body ground Always 10 kΩ or higher
      T3-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01CDA8E01
      Text in Illustration
      *a

      Component without harness connected

      (No. 1 Ultrasonic Sensor (Rear Left 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 SENSOR) Click here

    OK

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


    1. A01CDA8E01
      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) 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

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


    1. A01CDA8E01
      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) 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

  9. REPLACE NO. 1 ULTRASONIC SENSOR (REAR LEFT 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 DTCs are output B

    B

    END (REAR LEFT SENSOR WAS DEFECTIVE)

    A

  11. REPLACE NO. 1 ULTRASONIC SENSOR (REAR LEFT 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 DTCs are output B

    B

    END (REAR LEFT CENTER SENSOR WAS DEFECTIVE)

    A

  13. REPLACE NO. 1 ULTRASONIC SENSOR (REAR RIGHT 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 DTCs are output B

    B

    END (REAR RIGHT CENTER SENSOR WAS DEFECTIVE)

    A

  15. REPLACE NO. 1 ULTRASONIC SENSOR (REAR RIGHT 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 DTCs are output B

    B

    END (REAR RIGHT SENSOR WAS DEFECTIVE)

    A

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here