LEXUS PARKING ASSIST-SENSOR SYSTEM(w/o Intelligent Clearance Sonar System), Diagnostic DTC:C1AEC

DTC Code DTC Name
C1AEC Front Sensor Communication Malfunction

DESCRIPTION

This DTC is stored when there is an open or short circuit in the communication line between the front sensors and the ECU, or when there is a malfunction in a front sensor.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1AEC Front Sensor Communication Malfunction An open or short circuit in the communication line between the front sensors and ECU or a malfunction in a front sensor during initialization mode after the engine switch is turned on (IG).

  • Front ultrasonic sensor circuit

  • Harness or connector

  • Clearance warning ECU assembly

WIRING DIAGRAM

B0059PVE13

PROCEDURE


  1. INITIALIZE FRONT CORNER ULTRASONIC SENSOR AND FRONT CENTER ULTRASONIC SENSOR


    1. Initialize the front corner ultrasonic sensor (FL and FR sensor) and front center ultrasonic sensor (FLC and FRC sensor).

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK DTC OUTPUT (C1AEC)


    1. Check for DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes

    2. Clear the DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Clear DTCs

    3. Recheck for DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes
      Result
      Result Proceed to
      No DTCs are output A
      DTC C1AEC is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  3. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - FRONT CORNER ULTRASONIC SENSOR [FR SENSOR])


    1. Disconnect the I20 clearance warning ECU assembly connector.

    2. Disconnect the B6 front corner ultrasonic sensor (FR sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I20-4 (BOF) - B6-4 (BI) Always Below 1 Ω
      I20-8 (SOF) - B6-5 (SI) Always Below 1 Ω
      I20-6 (E5) - B6-6 (EI) Always Below 1 Ω
      I20-4 (BOF) or B6-4 (BI) - Body ground Always 10 kΩ or higher
      I20-8 (SOF) or B6-5 (SI) - Body ground Always 10 kΩ or higher
      I20-6 (E5) or B6-6 (EI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (FRONT CORNER ULTRASONIC SENSOR [FR SENSOR] - FRONT CENTER ULTRASONIC SENSOR [FRC SENSOR])


    1. Disconnect the B6 front corner ultrasonic sensor (FR sensor) connector.

    2. Disconnect the B7 front center ultrasonic sensor (FRC sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B6-1 (BO) - B7-4 (BI) Always Below 1 Ω
      B6-2 (SO) - B7-5 (SI) Always Below 1 Ω
      B6-3 (EO) - B7-6 (EI) Always Below 1 Ω
      B6-1 (BO) or B7-4 (BI) - Body ground Always 10 kΩ or higher
      B6-2 (SO) or B7-5 (SI) - Body ground Always 10 kΩ or higher
      B6-3 (EO) or B7-6 (EI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (FRONT CENTER ULTRASONIC SENSOR [FRC SENSOR] - FRONT CENTER ULTRASONIC SENSOR [FLC SENSOR])


    1. Disconnect the B7 front center ultrasonic sensor (FRC sensor) connector.

    2. Disconnect the B8 front center ultrasonic sensor (FLC sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B7-1 (BO) - B8-4 (BI) Always Below 1 Ω
      B7-2 (SO) - B8-5 (SI) Always Below 1 Ω
      B7-3 (EO) - B8-6 (EI) Always Below 1 Ω
      B7-1 (BO) or B8-4 (BI) - Body ground Always 10 kΩ or higher
      B7-2 (SO) or B8-5 (SI) - Body ground Always 10 kΩ or higher
      B7-3 (EO) or B8-6 (EI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (FRONT CENTER ULTRASONIC SENSOR [FLC SENSOR] - FRONT CORNER ULTRASONIC SENSOR [FL SENSOR])


    1. Disconnect the B8 front center ultrasonic sensor (FLC sensor) connector.

    2. Disconnect the B9 front corner ultrasonic sensor (FL sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B8-1 (BO) - B9-4 (BI) Always Below 1 Ω
      B8-2 (SO) - B9-5 (SI) Always Below 1 Ω
      B8-3 (EO) - B9-6 (EI) Always Below 1 Ω
      B8-1 (BO) or B9-4 (BI) - Body ground Always 10 kΩ or higher
      B8-2 (SO) or B9-5 (SI) - Body ground Always 10 kΩ or higher
      B8-3 (EO) or B9-6 (EI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT FRONT CORNER ULTRASONIC SENSOR (FL SENSOR)


    1. Remove the front corner ultrasonic sensor (FL sensor).

      Click here

    2. Inspect the front corner ultrasonic sensor (FL sensor).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT CORNER ULTRASONIC SENSOR (FL SENSOR) Click here

    OK

  8. INSPECT FRONT CENTER ULTRASONIC SENSOR (FLC SENSOR)


    1. Remove the front center ultrasonic sensor (FLC sensor).

      Click here

    2. Inspect the front center ultrasonic sensor (FLC sensor).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT CENTER ULTRASONIC SENSOR (FLC SENSOR) Click here

    OK

  9. INSPECT FRONT CENTER ULTRASONIC SENSOR (FRC SENSOR)


    1. Remove the front center ultrasonic sensor (FRC sensor).

      Click here

    2. Inspect the front center ultrasonic sensor (FRC sensor).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT CENTER ULTRASONIC SENSOR (FRC SENSOR) Click here

    OK

  10. INSPECT FRONT CORNER ULTRASONIC SENSOR (FR SENSOR)


    1. Remove the front corner ultrasonic sensor (FR sensor).

      Click here

    2. Inspect the front corner ultrasonic sensor (FR sensor).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT CORNER ULTRASONIC SENSOR (FR SENSOR) Click here

    OK

  11. REPLACE FRONT CORNER ULTRASONIC SENSOR (FL SENSOR)


    1. Replace the front corner ultrasonic sensor (FL 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.

      Result
      Proceed to
      NEXT

    NEXT

  12. CHECK DTC OUTPUT (C1AEC)


    1. Clear the DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes
      Result
      Result Proceed to
      No DTCs are output A
      DTC C1AEC is output B

    A

    END (FRONT CORNER ULTRASONIC SENSOR [FL SENSOR] WAS DEFECTIVE)

    B

  13. REPLACE FRONT CENTER ULTRASONIC SENSOR (FLC SENSOR)


    1. Replace the front center ultrasonic sensor (FLC 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.

      Result
      Proceed to
      NEXT

    NEXT

  14. CHECK DTC OUTPUT (C1AEC)


    1. Clear the DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes
      Result
      Result Proceed to
      No DTCs are output A
      DTC C1AEC is output B

    A

    END (FRONT CENTER ULTRASONIC SENSOR [FLC SENSOR] WAS DEFECTIVE)

    B

  15. REPLACE FRONT CENTER ULTRASONIC SENSOR (FRC SENSOR)


    1. Replace the front center ultrasonic sensor (FRC 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.

      Result
      Proceed to
      NEXT

    NEXT

  16. CHECK DTC OUTPUT (C1AEC)


    1. Clear the DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes
      Result
      Result Proceed to
      No DTCs are output A
      DTC C1AEC is output B

    A

    END (FRONT CENTER ULTRASONIC SENSOR [FRC SENSOR] WAS DEFECTIVE)

    B

  17. REPLACE FRONT CORNER ULTRASONIC SENSOR (FR SENSOR)


    1. Replace the front corner ultrasonic sensor (FR 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.

      Result
      Proceed to
      NEXT

    NEXT

  18. CHECK DTC OUTPUT (C1AEC)


    1. Clear the DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes
      Result
      Result Proceed to
      No DTCs are output A
      DTC C1AEC is output B

    A

    END (FRONT CORNER ULTRASONIC SENSOR [FR SENSOR] WAS DEFECTIVE)

    B

    REPLACE CLEARANCE WARNING ECU ASSEMBLY for LHD: Click here
    REPLACE CLEARANCE WARNING ECU ASSEMBLY for RHD: Click here