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

DTC Code DTC Detection Condition Trouble Area
C1AEC 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

  • Clearance warning ECU

WIRING DIAGRAM

B001FCWE23

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      No DTC is output A
      DTC C1AEC is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

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


    1. Disconnect the G154 clearance warning ECU connector.

    2. Disconnect the B7 No. 1 ultrasonic sensor (front corner sensor LH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G154-21 (BOF) - B7-1 (BI) Always Below 1 Ω
      G154-9 (SOF) - B7-3 (SI) Always Below 1 Ω
      G154-19 (E1) - B7-5 (EI) Always Below 1 Ω
      G154-21 (BOF) - Body ground Always 10 kΩ or higher
      G154-9 (SOF) - Body ground Always 10 kΩ or higher
      G154-19 (E1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the B7 No. 1 ultrasonic sensor (front corner sensor LH) connector.

    2. Disconnect the B8 No. 1 ultrasonic sensor (front center sensor LH) connector.

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

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the B8 No. 1 ultrasonic sensor (front center sensor LH) connector.

    2. Disconnect the B9 No. 1 ultrasonic sensor (front center sensor RH) connector.

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

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the B9 No. 1 ultrasonic sensor (front center sensor RH) connector.

    2. Disconnect the B10 No. 1 ultrasonic sensor (front corner sensor RH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B9-2 (BO) - B10-1 (BI) Always Below 1 Ω
      B9-4 (SO) - B10-3 (SI) Always Below 1 Ω
      B9-6 (EO) - B10-5 (EI) Always Below 1 Ω
      B9-2 (BO) - Body ground Always 10 kΩ or higher
      B9-4 (SO) - Body ground Always 10 kΩ or higher
      B9-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

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


    NG

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

    OK

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


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

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


    NG

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

    OK

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


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

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


    NG

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

    OK

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


    1. Replace the No. 1 ultrasonic sensor (front corner sensor RH) with a normally functioning sensor Click here.


    NEXT

  10. CHECK FOR DTC (C1AEC)


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      No DTC is output A
      DTC C1AEC is output B

    A

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

    B

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


    1. Replace the No. 1 ultrasonic sensor (front 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 (C1AEC)


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      No DTC is output A
      DTC C1AEC is output B

    A

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

    B

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


    1. Replace the No. 1 ultrasonic sensor (front 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 (C1AEC)


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      No DTC is output A
      DTC C1AEC is output B

    A

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

    B

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


    1. Replace the No. 1 ultrasonic sensor (front 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 (C1AEC)


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      No DTC is output A
      DTC C1AEC is output (for LHD) B
      DTC C1AEC is output (for RHD) C

    A

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

    B

    REPLACE CLEARANCE WARNING ECU Click here

    C

    REPLACE CLEARANCE WARNING ECU Click here