LEXUS PARKING ASSIST-SENSOR 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 Code DTC Detection Condition Trouble Area
C1AEC Malfunctions of all front sensors are detected during initialization mode after power switch is turned on (IG)

  • Front sensor circuit

  • Clearance warning ECU

  • Harness or connector

WIRING DIAGRAM

A01GWDKE10

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

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

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  2. CHECK CLEARANCE WARNING ECU


    1. A01H0C6E18

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L159-19 (E1) - Body ground Always Below 1 Ω

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      L159-21 (BOF) - Body ground Power switch on (IG) 7.2 to 8.8 V

    NG

    REPLACE CLEARANCE WARNING ECU Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - FRONT LEFT SIDE SENSOR)


    1. A01GXOHE20

      Disconnect the L159 ECU connector.

    2. Disconnect the D1 sensor connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L159-21 (BOF) - D1-1 (BI) Always Below 1 Ω
      L159-9 (SOF) - D1-3 (SI) Always Below 1 Ω
      L159-19 (E1) - D1-5 (EI) Always Below 1 Ω
      L159-21 (BOF) - Body ground Always 10 kΩ or higher
      L159-9 (SOF) - Body ground Always 10 kΩ or higher
      L159-19 (E1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (FRONT LEFT SIDE SENSOR - FRONT LEFT CORNER SENSOR)


    1. A01GX4QE57

      Disconnect the D1 and D2 sensor connectors.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      D1-2 (BO) - D2-1 (BI) Always Below 1 Ω
      D1-4 (SO) - D2-3 (SI) Always Below 1 Ω
      D1-6 (EO) - D2-5 (EI) Always Below 1 Ω
      D1-2 (BO) - Body ground Always 10 kΩ or higher
      D1-4 (SO) - Body ground Always 10 kΩ or higher
      D1-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01GX4QE20

      Disconnect the D2 and D3 sensor connectors.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      D2-2 (BO) - D3-1 (BI) Always Below 1 Ω
      D2-4 (SO) - D3-3 (SI) Always Below 1 Ω
      D2-6 (EO) - D3-5 (EI) Always Below 1 Ω
      D2-2 (BO) - Body ground Always 10 kΩ or higher
      D2-4 (SO) - Body ground Always 10 kΩ or higher
      D2-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (FRONT LEFT CENTER SENSOR - FRONT RIGHT CENTER SENSOR)


    1. A01GX4QE21

      Disconnect the D3 and D4 sensor connectors.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      D3-2 (BO) - D4-1 (BI) Always Below 1 Ω
      D3-4 (SO) - D4-3 (SI) Always Below 1 Ω
      D3-6 (EO) - D4-5 (EI) Always Below 1 Ω
      D3-2 (BO) - Body ground Always 10 kΩ or higher
      D3-4 (SO) - Body ground Always 10 kΩ or higher
      D3-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (FRONT RIGHT CENTER SENSOR - FRONT RIGHT CORNER SENSOR)


    1. A01GX4QE15

      Disconnect the D4 and D6 sensor connectors.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      D4-2 (BO) - D6-1 (BI) Always Below 1 Ω
      D4-4 (SO) - D6-3 (SI) Always Below 1 Ω
      D4-6 (EO) - D6-5 (EI) Always Below 1 Ω
      D4-2 (BO) - Body ground Always 10 kΩ or higher
      D4-4 (SO) - Body ground Always 10 kΩ or higher
      D4-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (FRONT RIGHT CORNER SENSOR - FRONT RIGHT SIDE SENSOR)


    1. A01GX4QE58

      Disconnect the D6 and D5 sensor connectors.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      D6-2 (BO) - D5-1 (BI) Always Below 1 Ω
      D6-4 (SO) - D5-3 (SI) Always Below 1 Ω
      D6-6 (EO) - D5-5 (EI) Always Below 1 Ω
      D6-2 (BO) - Body ground Always 10 kΩ or higher
      D6-4 (SO) - Body ground Always 10 kΩ or higher
      D6-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to

      DTC C1AEC is output

      And, multi-information display indicates open circuit (Front Left, Front Center and Front Right)

      		 A

      DTC C1AEC is output

      And, multi-information display indicates open circuit (Front Center and Front Right)

      		 B

      DTC C1AEC is output

      And, multi-information display indicates open circuit (Front Right)

      		 C
      No DTC is output D

    B

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

    C

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

    D

    USE SIMULATION METHOD TO CHECK Click here

    A

  10. REPLACE NO. 1 ULTRASONIC SENSOR (FRONT LEFT SIDE SENSOR)


    1. Replace the ultrasonic sensor Click here with a normally functioning sensor.


    NEXT

  11. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to

      DTC C1AEC is output

      And, multi-information display indicates open circuit (Front Left, Front Center and Front Right)

      		 A

      DTC C1AEC is output

      And, multi-information display indicates open circuit (Front Center and Front Right)

      		 B

      DTC C1AEC is output

      And, multi-information display indicates open circuit (Front Right)

      		 C
      No DTC is output D

    B

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

    C

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

    D

    END (NO. 1 ULTRASONIC SENSOR [FRONT LEFT SIDE SENSOR] IS DEFECTIVE)

    A

  12. REPLACE NO. 1 ULTRASONIC SENSOR (FRONT RIGHT SIDE SENSOR)


    1. Replace the ultrasonic sensor Click here with a normally functioning sensor.


    NEXT

  13. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to

      DTC C1AEC is output

      And, multi-information display indicates open circuit (Front Left, Front Center and Front Right)

      		 A

      DTC C1AEC is output

      And, multi-information display indicates open circuit (Front Center and Front Right)

      		 B

      DTC C1AEC is output

      And, multi-information display indicates open circuit (Front Right)

      		 C
      No DTC is output D

    B

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

    C

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

    D

    END (NO. 1 ULTRASONIC SENSOR [FRONT RIGHT SIDE SENSOR] IS DEFECTIVE)

    A

  14. REPLACE NO. 1 ULTRASONIC SENSOR (FRONT LEFT CORNER SENSOR)


    1. Replace the ultrasonic sensor Click here with a normally functioning sensor.


    NEXT

  15. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to

      DTC C1AEC is output

      And, multi-information display indicates open circuit (Front Left, Front Center and Front Right)

      		 A

      DTC C1AEC is output

      And, multi-information display indicates open circuit (Front Center and Front Right)

      		 B

      DTC C1AEC is output

      And, multi-information display indicates open circuit (Front Right)

      		 C
      No DTC is output D

    B

    REPLACE CLEARANCE WARNING ECU Click here

    C

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

    D

    END (NO. 1 ULTRASONIC SENSOR [FRONT LEFT CORNER SENSOR] IS DEFECTIVE)

    A

  16. REPLACE NO. 1 ULTRASONIC SENSOR (FRONT LEFT CENTER SENSOR)


    1. Replace the ultrasonic sensor Click here with a normally functioning sensor.


    NEXT

  17. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to

      DTC C1AEC is output

      And, multi-information display indicates open circuit (Front Center and Front Right)

      		 A

      DTC C1AEC is output

      And, multi-information display indicates open circuit (Front Right)

      		 B
      No DTC is output C

    B

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

    C

    END (NO. 1 ULTRASONIC SENSOR [FRONT LEFT CENTER SENSOR] IS DEFECTIVE

    A

  18. REPLACE NO. 1 ULTRASONIC SENSOR (FRONT RIGHT CENTER SENSOR)


    1. Replace the ultrasonic sensor Click here with a normally functioning sensor.


    NEXT

  19. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to

      DTC C1AEC is output

      And, multi-information display indicates open circuit (Front Center and Front Right)

      		 A

      DTC C1AEC is output

      And, multi-information display indicates open circuit (Front Right)

      		 B
      No DTC is output C

    B

    REPLACE CLEARANCE WARNING ECU Click here

    C

    END (NO. 1 ULTRASONIC SENSOR [FRONT RIGHT CENTER SENSOR] IS DEFECTIVE)

    A

  20. REPLACE NO. 1 ULTRASONIC SENSOR (FRONT RIGHT CORNER SENSOR)


    1. Replace the ultrasonic sensor Click here with a normally functioning sensor.


    NEXT

  21. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to

      DTC C1AEC is output

      And, multi-information display indicates open circuit (Front Right)

      		 A
      No DTC is output B

    B

    END (NO. 1 ULTRASONIC SENSOR [FRONT RIGHT CORNER SENSOR] IS DEFECTIVE)

    A

    REPLACE CLEARANCE WARNING ECU Click here