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 engine switch is turned on (IG).

  • No. 1 ultrasonic sensor (rear side)

  • Harness or connector

  • Parking assist ECU*1

  • Clearance warning ECU assembly*2

WIRING DIAGRAM

A01EQPPE05
A01EQPPE06

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC C1AED is output (w/ Side Monitor System) A
      DTC C1AED is output (w/o Side Monitor System) B
      DTC C1AED is not output C

    B

    CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [RR SENSOR] - CLEARANCE WARNING ECU) Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

  2. CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [RR SENSOR] - PARKING ASSIST ECU)


    1. Disconnect the O7 No. 1 ultrasonic sensor (RR sensor) connector.

    2. Disconnect the F75 parking assist ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O7-1 (BI) - F75-20 (CSB2) Always Below 1 Ω
      O7-3 (SI) - F75-3 (LIN2) Always Below 1 Ω
      O7-5 (EI) - F75-4 (CSG2) Always Below 1 Ω
      O7-1 (BI) - Body ground Always 10 kΩ or higher
      O7-3 (SI) - Body ground Always 10 kΩ or higher
      O7-5 (EI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the O7 No. 1 ultrasonic sensor (RR sensor) connector.

    2. Disconnect the O8 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
      O7-2 (BO) - O8-1 (BI) Always Below 1 Ω
      O7-4 (SO) - O8-3 (SI) Always Below 1 Ω
      O7-6 (EO) - O8-5 (EI) Always Below 1 Ω
      O7-2 (BO) - Body ground Always 10 kΩ or higher
      O7-4 (SO) - Body ground Always 10 kΩ or higher
      O7-6 (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 [RRC SENSOR] - NO. 1 ULTRASONIC SENSOR [RLC SENSOR])


    1. Disconnect the O8 No. 1 ultrasonic sensor (RRC sensor) connector.

    2. Disconnect the O9 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
      O8-2 (BO) - O9-1 (BI) Always Below 1 Ω
      O8-4 (SO) - O9-3 (SI) Always Below 1 Ω
      O8-6 (EO) - O9-5 (EI) Always Below 1 Ω
      O8-2 (BO) - Body ground Always 10 kΩ or higher
      O8-4 (SO) - Body ground Always 10 kΩ or higher
      O8-6 (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 [RLC SENSOR] - NO. 1 ULTRASONIC SENSOR [RL SENSOR])


    1. Disconnect the O9 No. 1 ultrasonic sensor (RLC sensor) connector.

    2. Disconnect the O10 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
      O9-2 (BO) - O10-1 (BI) Always Below 1 Ω
      O9-4 (SO) - O10-3 (SI) Always Below 1 Ω
      O9-6 (EO) - O10-5 (EI) Always Below 1 Ω
      O9-2 (BO) - Body ground Always 10 kΩ or higher
      O9-4 (SO) - Body ground Always 10 kΩ or higher
      O9-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK PARKING ASSIST ECU


    1. A01ESAJE14
      Text in Illustration
      *a

      Component with harness connected

      (Parking Assist ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F75-20 (CSB2) - Body ground Engine switch on (IG) 7.2 to 8.8 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F75-4 (CSG2) - Body ground Always Below 1 Ω

    NG

    REPLACE PARKING ASSIST ECU Click here

    OK

  7. CHECK FOR DTC


    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
      DTC C1AED is not output C

    B

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

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

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


    1. Replace the No. 1 ultrasonic sensor (RR sensor) with a normally functioning one Click here.


    NEXT

  9. CHECK FOR DTC


    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
      DTC C1AED is not output C

    B

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

    C

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

    A

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


    1. Replace the No. 1 ultrasonic sensor (RL sensor) with a normally functioning one Click here.


    NEXT

  11. CHECK FOR DTC


    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
      DTC C1AED is output and multi-information display indicates open circuit (rear left, rear center and rear right) B
      DTC C1AED is not output C

    B

    REPLACE PARKING ASSIST ECU Click here

    C

    END (NO. 1 ULTRASONIC SENSOR [RL SENSOR] IS DEFECTIVE)

    A

  12. REPLACE NO. 1 ULTRASONIC SENSOR RH (RRC SENSOR)


    1. Replace the No. 1 ultrasonic sensor (RRC sensor) with a normally functioning one Click here.


    NEXT

  13. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC C1AED is not output.

    NG

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

    OK

    END (NO. 1 ULTRASONIC SENSOR [RRC SENSOR] IS DEFECTIVE)

  14. REPLACE NO. 1 ULTRASONIC SENSOR (RLC SENSOR)


    1. Replace the No. 1 ultrasonic sensor (RLC sensor) with a normally functioning one Click here.


    NEXT

  15. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC C1AED is not output.

    NG

    REPLACE PARKING ASSIST ECU Click here

    OK

    END (NO. 1 ULTRASONIC SENSOR [RLC SENSOR] IS DEFECTIVE)

  16. CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [RR SENSOR] - CLEARANCE WARNING ECU)


    1. Disconnect the O7 No. 1 ultrasonic sensor (RR sensor) connector.

    2. Disconnect the F12 clearance warning ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O7-1 (BI) - F12-7 (CSB2) Always Below 1 Ω
      O7-3 (SI) - F12-24 (LIN2) Always Below 1 Ω
      O7-5 (EI) - F12-18 (CSG2) Always Below 1 Ω
      O7-1 (BI) - Body ground Always 10 kΩ or higher
      O7-3 (SI) - Body ground Always 10 kΩ or higher
      O7-5 (EI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the O7 No. 1 ultrasonic sensor (RR sensor) connector.

    2. Disconnect the O8 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
      O7-2 (BO) - O8-1 (BI) Always Below 1 Ω
      O7-4 (SO) - O8-3 (SI) Always Below 1 Ω
      O7-6 (EO) - O8-5 (EI) Always Below 1 Ω
      O7-2 (BO) - Body ground Always 10 kΩ or higher
      O7-4 (SO) - Body ground Always 10 kΩ or higher
      O7-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the O8 No. 1 ultrasonic sensor (RRC sensor) connector.

    2. Disconnect the O9 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
      O8-2 (BO) - O9-1 (BI) Always Below 1 Ω
      O8-4 (SO) - O9-3 (SI) Always Below 1 Ω
      O8-6 (EO) - O9-5 (EI) Always Below 1 Ω
      O8-2 (BO) - Body ground Always 10 kΩ or higher
      O8-4 (SO) - Body ground Always 10 kΩ or higher
      O8-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the O9 No. 1 ultrasonic sensor (RLC sensor) connector.

    2. Disconnect the O10 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
      O9-2 (BO) - O10-1 (BI) Always Below 1 Ω
      O9-4 (SO) - O10-3 (SI) Always Below 1 Ω
      O9-6 (EO) - O10-5 (EI) Always Below 1 Ω
      O9-2 (BO) - Body ground Always 10 kΩ or higher
      O9-4 (SO) - Body ground Always 10 kΩ or higher
      O9-6 (EO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  20. CHECK CLEARANCE WARNING ECU ASSEMBLY


    1. A01EN1HE13
      Text in Illustration
      *a

      Component with harness connected

      (Clearance Warning ECU Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F12-7 (CSB2) - Body ground Engine switch on (IG) 7.2 to 8.8 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F12-18 (CSG2) - Body ground Always Below 1 Ω

    NG

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    OK

  21. CHECK FOR DTC


    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
      DTC C1AED is not output C

    B

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

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

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


    1. Replace the No. 1 ultrasonic sensor (RR sensor) with a normally functioning one Click here.


    NEXT

  23. CHECK FOR DTC


    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
      DTC C1AED is not output C

    B

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

    C

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

    A

  24. REPLACE NO. 1 ULTRASONIC SENSOR (RL SENSOR)


    1. Replace the No. 1 ultrasonic sensor (RL sensor) with a normally functioning one Click here.


    NEXT

  25. CHECK FOR DTC


    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
      DTC C1AED is output and multi-information display indicates open circuit (rear left, rear center and rear right) B
      DTC C1AED is not output C

    B

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    C

    END (NO. 1 ULTRASONIC SENSOR [RL SENSOR] IS DEFECTIVE)

    A

  26. REPLACE NO. 1 ULTRASONIC SENSOR (RRC SENSOR)


    1. Replace the No. 1 ultrasonic sensor (RRC sensor) with a normally functioning on Click here.


    NEXT

  27. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC C1AED is not output.

    NG

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

    OK

    END (NO. 1 ULTRASONIC SENSOR [RRC SENSOR] IS DEFECTIVE)

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


    1. Replace the No. 1 ultrasonic sensor (RLC sensor) with a normally functioning one Click here.


    NEXT

  29. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC C1AED is not output.

    NG

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    OK

    END (NO. 1 ULTRASONIC SENSOR [RLC SENSOR] IS DEFECTIVE)