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 Malfunctions of all rear sensors are detected during initialization mode after power switch is turned on (IG)

  • Rear sensor circuit

  • Clearance warning ECU

  • Harness or connector

WIRING DIAGRAM

A01H1CYE04

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Check 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 CLEARANCE WARNING ECU


    1. A01H0C6E19

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L159-18 (E2) - 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
      L159-7 (BOR) - 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 - REAR RIGHT CORNER SENSOR)


    1. A01GXOHE21

      Disconnect the L159 ECU connector.

    2. Disconnect the Z4 sensor connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L159-7 (BOR) - Z4-1 (BI) Always Below 1 Ω
      L159-24 (SOR) - Z4-3 (SI) Always Below 1 Ω
      L159-18 (E2) - Z4-5 (EI) Always Below 1 Ω
      L159-7 (BOR) - Body ground Always 10 kΩ or higher
      L159-24 (SOR) - Body ground Always 10 kΩ or higher
      L159-18 (E2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (REAR RIGHT CORNER SENSOR - REAR RIGHT CENTER SENSOR)


    1. A01GX4QE27

      Disconnect the Z4 and Z3 sensor connectors.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      Z4-2 (BO) - Z3-1 (BI) Always Below 1 Ω
      Z4-4 (SO) - Z3-3 (SI) Always Below 1 Ω
      Z4-6 (EO) - Z3-5 (EI) Always Below 1 Ω
      Z4-2 (BO) - Body ground Always 10 kΩ or higher
      Z4-4 (SO) - Body ground Always 10 kΩ or higher
      Z4-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (REAR RIGHT CENTER SENSOR - REAR LEFT CENTER SENSOR)


    1. A01GX4QE28

      Disconnect the Z3 and Z2 sensor connectors.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      Z3-2 (BO) - Z2-1 (BI) Always Below 1 Ω
      Z3-4 (SO) - Z2-3 (SI) Always Below 1 Ω
      Z3-6 (EO) - Z2-5 (EI) Always Below 1 Ω
      Z3-2 (BO) - Body ground Always 10 kΩ or higher
      Z3-4 (SO) - Body ground Always 10 kΩ or higher
      Z3-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (REAR LEFT CENTER SENSOR - REAR LEFT CORNER SENSOR)


    1. A01GX4QE29

      Disconnect the Z2 and Z1 sensor connectors.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      Z2-2 (BO) - Z1-1 (BI) Always Below 1 Ω
      Z2-4 (SO) - Z1-3 (SI) Always Below 1 Ω
      Z2-6 (EO) - Z1-5 (EI) Always Below 1 Ω
      Z2-2 (BO) - Body ground Always 10 kΩ or higher
      Z2-4 (SO) - Body ground Always 10 kΩ or higher
      Z2-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Check 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 Left and Rear Center)

      		 B
      No DTCs are output C

    B

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

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

  8. REPLACE NO. 1 ULTRASONIC SENSOR (REAR RIGHT CORNER SENSOR)


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


    NEXT

  9. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC C1AED is output A

      DTC C1AED is output

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

      		 B

      No DTC is output

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

      		 C

    B

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

    C

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

    A

  10. REPLACE NO. 1 ULTRASONIC SENSOR (REAR LEFT CORNER 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 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 Left and Rear Center)

      		 B
      No DTC is output C

    B

    REPLACE CLEARANCE WARNING ECU Click here

    C

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

    A

  12. REPLACE NO. 1 ULTRASONIC SENSOR (REAR RIGHT CENTER 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 C1AED is output

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

      		 A
      No DTC is output B

    B

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

    A

  14. REPLACE NO. 1 ULTRASONIC SENSOR (REAR LEFT CENTER 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 C1AED is output

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

      		 A
      No DTC is output B

    B

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

    A

    REPLACE CLEARANCE WARNING ECU Click here