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TOYOTA PARKING ASSIST-SENSOR SYSTEM, Diagnostic DTC:C1AEC

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DTC Code DTC Name
C1AEC Front Sensor Communication Malfunction
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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 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).

  • No. 1 ultrasonic sensor (front side)

  • Harness or connector

  • Parking assist ECU*1

  • Clearance warning ECU assembly*2

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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

    CHECK FOR DTC


    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      Table 1. Result
      Result Proceed to
      DTC C1AEC is output (w/ Side Monitor System) A
      DTC C1AEC is output (w/o Side Monitor System) B
      DTC C1AEC is not output C

  2. Click here

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


    1. Disconnect the B8 No. 1 ultrasonic sensor (FL sensor) connector.

    2. Disconnect the F76 parking assist ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B8-1 (BI) - F76-5 (CSB1) Always Below 1 Ω
      B8-3 (SI) - F76-23 (LIN1) Always Below 1 Ω
      B8-5 (EI) - F76-6 (CSG1) Always Below 1 Ω
      B8-1 (BI) - Body ground Always 10 kΩ or higher
      B8-3 (SI) - Body ground Always 10 kΩ or higher
      B8-5 (EI) - Body ground Always 10 kΩ or higher

  3. Click here

    CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [FL SENSOR] - NO. 1 ULTRASONIC SENSOR [FR SENSOR])


    1. Disconnect the B8 No. 1 ultrasonic sensor (FL sensor) connector.

    2. Disconnect the B7 No. 1 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
      B8-2 (BO) - B7-1 (BI) Always Below 1 Ω
      B8-4 (SO) - B7-3 (SI) Always Below 1 Ω
      B8-6 (EO) - B7-5 (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

  4. Click here

    CHECK PARKING ASSIST ECU


    1. A015E7BE15

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F76-5 (CSB1) - 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
      F76-6 (CSG1) - Body ground Always Below 1 Ω
      Table 2. Text in Illustration
      *a

      Component with harness connected

      (Parking Assist ECU)

  5. Click here

    CHECK FOR DTC


    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      OK
      DTC C1AEC is not output.

  6. Click here

    REPLACE NO. 1 ULTRASONIC SENSOR (FL SENSOR)


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


  7. Click here

    CHECK FOR DTC


    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      OK
      DTC C1AEC is not output.

  8. Click here

    REPLACE NO. 1 ULTRASONIC SENSOR (FR SENSOR)


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


  9. Click here

    CHECK FOR DTC


    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      OK
      DTC C1AEC is not output.

  10. Click here

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


    1. Disconnect the B8 No. 1 ultrasonic sensor [FL 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
      B8-1 (BI) - F12-21 (CSB1) Always Below 1 Ω
      B8-3 (SI) - F12-9 (LIN1) Always Below 1 Ω
      B8-5 (EI) - F12-19 (CSG1) Always Below 1 Ω
      B8-1 (BI) - Body ground Always 10 kΩ or higher
      B8-3 (SI) - Body ground Always 10 kΩ or higher
      B8-5 (EI) - Body ground Always 10 kΩ or higher

  11. Click here

    CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [FL SENSOR] - NO. 1 ULTRASONIC SENSOR [FR SENSOR])


    1. Disconnect the B8 No. 1 ultrasonic sensor (FL sensor) connector.

    2. Disconnect the B7 No. 1 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
      B8-2 (BO) - B7-1 (BI) Always Below 1 Ω
      B8-4 (SO) - B7-3 (SI) Always Below 1 Ω
      B8-6 (EO) - B7-5 (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

  12. Click here

    CHECK CLEARANCE WARNING ECU ASSEMBLY


    1. A015DQUE14

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F12-21 (CSB1) - 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
      F12-19 (CSG1) - Body ground Always Below 1 Ω
      Table 3. Text in Illustration
      *a

      Component with harness connected

      (Clearance Warning ECU Assembly)

  13. Click here

    CHECK FOR DTC


    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      OK
      DTC C1AEC is not output.

  14. Click here

    REPLACE NO. 1 ULTRASONIC SENSOR (FL SENSOR)


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


  15. Click here

    CHECK FOR DTC


    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      OK
      DTC C1AEC is not output.

  16. Click here

    REPLACE NO. 1 ULTRASONIC SENSOR (FR SENSOR)


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


  17. Click here

    CHECK FOR DTC


    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      OK
      DTC C1AEC is not output.

  18. Click here

    REPLACE CLEARANCE WARNING ECU ASSEMBLYClick here

  19. Click here

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

  20. Click here

    USE SIMULATION METHOD TO CHECKClick here

  21. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  22. Click here

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

  23. Click here

    REPLACE PARKING ASSIST ECUClick here