TOYOTA PARKING ASSIST-SENSOR SYSTEM(w/ Multi-display), 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 ECU, or when there is a malfunction in a rear sensor.

DTC Code 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 ignition switch is turned ON.

  • Rear ultrasonic sensor circuit

  • Clearance warning ECU

WIRING DIAGRAM

B001FCWE26

PROCEDURE


  1. CHECK FOR DTC (C1AED)


    1. Clear the DTCs Click here.

    2. Recheck for DTCs Click here.

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

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

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


    1. Disconnect the I9*1 or G228*2 clearance warning ECU connector.


      • *1: for 4 Sensor Type

      • *2: for 8 Sensor Type

    2. Disconnect the V7 No. 1 ultrasonic sensor (rear corner sensor LH) connector.

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

      Standard Resistance
      for 4 Sensor Type
      Tester Connection Condition Specified Condition
      I9-22 (BOR) - V7-1 (BI) Always Below 1 Ω
      I9-24 (SOR) - V7-3 (SI) Always Below 1 Ω
      I9-23 (E1) - V7-5 (EI) Always Below 1 Ω
      I9-22 (BOR) - Body ground Always 10 kΩ or higher
      I9-24 (SOR) - Body ground Always 10 kΩ or higher
      I9-23 (E1) - Body ground Always 10 kΩ or higher
      for 8 Sensor Type
      Tester Connection Condition Specified Condition
      G228-22 (BOR) - V7-1 (BI) Always Below 1 Ω
      G228-24 (SOR) - V7-3 (SI) Always Below 1 Ω
      G228-23 (E1) - V7-5 (EI) Always Below 1 Ω
      G228-22 (BOR) - Body ground Always 10 kΩ or higher
      G228-24 (SOR) - Body ground Always 10 kΩ or higher
      G228-23 (E1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the V7 No. 1 ultrasonic sensor (rear corner sensor LH) connector.

    2. Disconnect the V6 No. 1 ultrasonic sensor (rear center sensor LH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V7-2 (BO) - V6-1 (BI) Always Below 1 Ω
      V7-4 (SO) - V6-3 (SI) Always Below 1 Ω
      V7-6 (EO) - V6-5 (EI) Always Below 1 Ω
      V7-2 (BO) - Body ground Always 10 kΩ or higher
      V7-4 (SO) - Body ground Always 10 kΩ or higher
      V7-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (REAR CENTER SENSOR LH - REAR CENTER SENSOR RH)


    1. Disconnect the V6 No. 1 ultrasonic sensor (rear center sensor LH) connector.

    2. Disconnect the U6 No. 1 ultrasonic sensor (rear center sensor RH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V6-2 (BO) - U6-1 (BI) Always Below 1 Ω
      V6-4 (SO) - U6-3 (SI) Always Below 1 Ω
      V6-6 (EO) - U6-5 (EI) Always Below 1 Ω
      V6-2 (BO) - Body ground Always 10 kΩ or higher
      V6-4 (SO) - Body ground Always 10 kΩ or higher
      V6-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the U6 No. 1 ultrasonic sensor (rear center sensor RH) connector.

    2. Disconnect the U7 No. 1 ultrasonic sensor (rear corner sensor RH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U6-2 (BO) - U7-1 (BI) Always Below 1 Ω
      U6-4 (SO) - U7-3 (SI) Always Below 1 Ω
      U6-6 (EO) - U7-5 (EI) Always Below 1 Ω
      U6-2 (BO) - Body ground Always 10 kΩ or higher
      U6-4 (SO) - Body ground Always 10 kΩ or higher
      U6-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT NO. 1 ULTRASONIC SENSOR (REAR CORNER SENSOR LH)


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

    2. Inspect the No. 1 ultrasonic sensor (rear corner sensor LH) Click here.


    NG

    REPLACE NO. 1 ULTRASONIC SENSOR (REAR CORNER SENSOR LH) Click here

    OK

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


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

    2. Inspect the No. 1 ultrasonic sensor (rear center sensor LH) Click here.


    NG

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

    OK

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


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

    2. Inspect the No. 1 ultrasonic sensor (rear center sensor RH) Click here.


    NG

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

    OK

  9. REPLACE NO. 1 ULTRASONIC SENSOR (REAR CORNER SENSOR RH)


    1. Replace the No. 1 ultrasonic sensor (rear corner sensor RH) 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 FOR DTC (C1AED)


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

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

    A

    END (NO. 1 ULTRASONIC SENSOR [REAR CORNER SENSOR RH] WAS DEFECTIVE)

    B

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


    1. Replace the No. 1 ultrasonic sensor (rear center sensor LH) 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 FOR DTC (C1AED)


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

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

    A

    END (NO. 1 ULTRASONIC SENSOR [REAR CENTER SENSOR LH] WAS DEFECTIVE)

    B

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


    1. Replace the No. 1 ultrasonic sensor (rear center sensor RH) 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 FOR DTC (C1AED)


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

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

    A

    END (NO. 1 ULTRASONIC SENSOR [REAR CENTER SENSOR RH] WAS DEFECTIVE)

    B

  15. REPLACE NO. 1 ULTRASONIC SENSOR (REAR CORNER SENSOR LH)


    1. Replace the No. 1 ultrasonic sensor (rear corner sensor LH) 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 FOR DTC (C1AED)


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

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

    A

    END (NO. 1 ULTRASONIC SENSOR [REAR CORNER SENSOR LH] WAS DEFECTIVE)

    B

    REPLACE CLEARANCE WARNING ECU Click here

    C

    REPLACE CLEARANCE WARNING ECU Click here