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 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 power switch is turned on (IG).

  • No. 1 ultrasonic sensor (rear side)

  • Clearance warning ECU assembly

  • Harness or connector

WIRING DIAGRAM

A01FTONE04

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC (C1AED)


    1. Clear the DTCs Click here.

    2. 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 ASSEMBLY - NO. 1 ULTRASONIC SENSOR [RL SENSOR])


    1. Disconnect the N10 clearance warning ECU assembly connector.

    2. Disconnect the b1 No. 1 ultrasonic sensor (RL sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N10-22 (BOR) - b1-1 (BI) Always Below 1 Ω
      N10-24 (SOR) - b1-3 (SI) Always Below 1 Ω
      N10-23 (E1) - b1-5 (EI) Always Below 1 Ω
      N10-22 (BOR) - Body ground Always 10 kΩ or higher
      N10-24 (SOR) - Body ground Always 10 kΩ or higher
      N10-23 (E1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [RL SENSOR] - NO. 1 ULTRASONIC SENSOR [RLC SENSOR])


    1. Disconnect the b1 No. 1 ultrasonic sensor (RL sensor) connector.

    2. Disconnect the b2 No. 1 ultrasonic sensor (RLC sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      b1-2 (BO) - b2-1 (BI) Always Below 1 Ω
      b1-4 (SO) - b2-3 (SI) Always Below 1 Ω
      b1-6 (EO) - b2-5 (EI) Always Below 1 Ω
      b1-2 (BO) - Body ground Always 10 kΩ or higher
      b1-4 (SO) - Body ground Always 10 kΩ or higher
      b1-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (NO.1 ULTRASONIC SENSOR [RLC SENSOR] - NO. 1 ULTRASONIC SENSOR [RRC SENSOR])


    1. Disconnect the b2 No. 1 ultrasonic sensor (RLC sensor) connector.

    2. Disconnect the b3 No. 1 ultrasonic sensor (RRC sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      b2-2 (BO) - b3-1 (BI) Always Below 1 Ω
      b2-4 (SO) - b3-3 (SI) Always Below 1 Ω
      b2-6 (EO) - b3-5 (EI) Always Below 1 Ω
      b2-2 (BO) - Body ground Always 10 kΩ or higher
      b2-4 (SO) - Body ground Always 10 kΩ or higher
      b2-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [RRC SENSOR] - NO. 1 ULTRASONIC SENSOR [RR SENSOR])


    1. Disconnect the b3 No. 1 ultrasonic sensor (RRC sensor) connector.

    2. Disconnect the b4 No. 1 ultrasonic sensor (RR sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      b3-2 (BO) - b4-1 (BI) Always Below 1 Ω
      b3-4 (SO) - b4-3 (SI) Always Below 1 Ω
      b3-6 (EO) - b4-5 (EI) Always Below 1 Ω
      b3-2 (BO) - Body ground Always 10 kΩ or higher
      b3-4 (SO) - Body ground Always 10 kΩ or higher
      b3-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK CLEARANCE WARNING ECU ASSEMBLY


    1. A01FQXGE02
      Text in Illustration
      *a

      Component with harness connected

      (Clearance Warning ECU Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N10-23 (E1) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      N10-22 (BOR) - Body ground Always 11 to 14 V

    NG

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    OK

  7. CHECK FOR DTC (C1AED)


    1. Clear the DTCs Click here.

    2. Recheck for DTCs Click here.

      Result
      Result Proceed to
      DTC C1AED is output and multi-information display indicates open circuit (Rear Left, Rear Center and Rear Right) A
      DTC C1AED is output and multi-information display indicates open circuit (Rear Center and Rear Right) B
      No DTC is output C

    B

    INSPECT NO. 1 ULTRASONIC SENSOR (RLC SENSOR) Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

  8. CHECK NO. 1 ULTRASONIC SENSOR (RL SENSOR)


    1. Remove the No. 1 ultrasonic sensor (RL sensor) Click here.

    2. Inspect No. 1 ultrasonic sensor (RL sensor) Click here.


    NG

    REPLACE NO. 1 ULTRASONIC SENSOR (RL SENSOR) Click here

    OK

  9. CHECK FOR DTC (C1AED)


    1. Clear the DTCs Click here.

    2. Recheck for DTCs Click here.

      Result
      Result Proceed to
      DTC C1AED is output and multi-information display indicates open circuit (Rear Left, Rear Center and Rear Right) A
      DTC C1AED is output and multi-information display indicates open circuit (Rear Center and Rear Right) B
      No DTC is output C

    B

    INSPECT NO. 1 ULTRASONIC SENSOR (RLC SENSOR) Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

  10. REPLACE NO. 1 ULTRASONIC SENSOR (RR SENSOR)


    1. Replace the No. 1 ultrasonic sensor (RR 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

  11. CHECK FOR DTC (C1AED)


    1. Clear the DTCs Click here.

    2. Recheck for DTCs Click here.

      Result
      Result Proceed to
      DTC C1AED is output and multi-information display indicates open circuit (Rear Left, Rear Center and Rear Right) A
      DTC C1AED is output and multi-information display indicates open circuit (Rear Center and Rear Right) B
      No DTC is output C

    B

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    C

    END (NO. 1 ULTRASONIC SENSOR [RR SENSOR] WAS DEFECTIVE)

    A

  12. INSPECT NO. 1 ULTRASONIC SENSOR (RLC SENSOR)


    1. Remove the No. 1 ultrasonic sensor (RLC sensor) Click here.

    2. Inspect the No. 1 ultrasonic sensor (RLC sensor) Click here.


    NG

    REPLACE NO. 1 ULTRASONIC SENSOR (RLC SENSOR) Click here

    OK

  13. 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

    B

    INSPECT NO. 1 ULTRASONIC SENSOR (RRC SENSOR) Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  14. INSPECT NO. 1 ULTRASONIC SENSOR (RRC SENSOR)


    1. Remove the No. 1 ultrasonic sensor (RRC sensor) Click here.

    2. Inspect the No. 1 ultrasonic sensor (RRC sensor) Click here.


    NG

    REPLACE NO. 1 ULTRASONIC SENSOR (RRC SENSOR) Click here

    OK

  15. 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

    B

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here