TOYOTA PARKING ASSIST-SENSOR SYSTEM(except Hatchback), Diagnostic DTC:C1AE7

DTC Code DTC Name
C1AE7 Rear Left Center Sensor Malfunction

DESCRIPTION

The No. 4 ultrasonic sensor (rear center LH) is installed on the rear bumper. The ECU detects obstacles based on signals received from the No. 4 ultrasonic sensor (rear center LH). If the No. 4 ultrasonic sensor (rear center LH) has an open circuit or other malfunction, it will not function normally. (for Wagon)

The No. 3 ultrasonic sensor (rear center LH) is installed on the rear bumper. The ECU detects obstacles based on signals received from the No. 3 ultrasonic sensor (rear center LH). If the No. 3 ultrasonic sensor (rear center LH) has an open circuit or other malfunction, it will not function normally. (for Sedan)

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1AE7

Rear Left Center Sensor Malfunction

  • A malfunction of the No. 4 ultrasonic sensor (rear center LH). (for Wagon)

  • A malfunction of the No. 3 ultrasonic sensor (rear center LH). (for Sedan)

  • A short or open in the harness or connector

  • No. 4 ultrasonic sensor (rear center LH) (for Wagon)

  • No. 3 ultrasonic sensor (rear center LH) (for Sedan)

  • Harness or connector

  • Clearance warning ECU assembly

WIRING DIAGRAM

E267085E41
E267085E42

CAUTION / NOTICE / HINT

Note:

  • If DTCs are output after repairs, turn the ignition switch to ON and turn the back sonar or clearance sonar switch assembly on. Then clear the DTCs.

    Click here

  • Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization may be needed. Refer to Initialization.

    Click here

PROCEDURE

  1. CONFIRM MODEL

    1. Choose the model to be inspected.

    Result

    Result

    Proceed to

    for Wagon

    A

    for Sedan

    B
    B

    CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - NO. 3 ULTRASONIC SENSOR (REAR CENTER LH))Click here

    A

  2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - NO. 4 ULTRASONIC SENSOR (REAR CENTER LH))

    1. Disconnect the E98 clearance warning ECU assembly connector.

    2. Disconnect the R3 No. 4 ultrasonic sensor (rear center LH) connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E98-1 (E1) - R3-1 (EI)

      Always

      Below 1 Ω

      E98-4 (BOR) - R3-3 (BI)

      Always

      Below 1 Ω

      E98-20 (S4) - R3-2 (SI)

      Always

      Below 1 Ω

      E98-1 (E1) - E98-20 (S4)

      Always

      10 kΩ or higher

      E98-4 (BOR) - E98-20 (S4)

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE NO. 4 ULTRASONIC SENSOR (REAR CENTER LH)

    1. Replace the No. 4 ultrasonic sensor (rear center LH) with a known good one.

      Click here

      Tip:

      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.

    Result

    Proceed to

    NEXT
    NEXT

  4. CHECK DTC OUTPUT

    1. Clear the DTCs.

      Body Electrical > Clearance Sonar / Simple-IPA. > Clear DTCs

    2. Check for DTCs.

      Body Electrical > Clearance Sonar / Simple-IPA. > Trouble Codes

      OK

      No DTCs are output.

    Result

    Result

    Proceed to

    OK

    A

    NG

    B
    A

    END

    B

    REPLACE CLEARANCE WARNING ECU ASSEMBLY

    for LHD:Click here

    for RHD:Click here

  5. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - NO. 3 ULTRASONIC SENSOR (REAR CENTER LH))

    1. Disconnect the E98 clearance warning ECU assembly connector.

    2. Disconnect the R3 No. 3 ultrasonic sensor (rear center LH) connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E98-1 (E1) - R3-1 (EI)

      Always

      Below 1 Ω

      E98-4 (BOR) - R3-3 (BI)

      Always

      Below 1 Ω

      E98-20 (S4) - R3-2 (SI)

      Always

      Below 1 Ω

      E98-1 (E1) - E98-20 (S4)

      Always

      10 kΩ or higher

      E98-4 (BOR) - E98-20 (S4)

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE NO. 3 ULTRASONIC SENSOR (REAR CENTER LH)

    1. Replace the No. 3 ultrasonic sensor (rear center LH) with a known good one.

      Click here

      Tip:

      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.

    Result

    Proceed to

    NEXT
    NEXT

  7. CHECK DTC OUTPUT

    1. Clear the DTCs.

      Body Electrical > Clearance Sonar / Simple-IPA. > Clear DTCs

    2. Check for DTCs.

      Body Electrical > Clearance Sonar / Simple-IPA. > Trouble Codes

      OK

      No DTCs are output.

    Result

    Result

    Proceed to

    OK

    A

    NG

    B
    A

    END

    B

    REPLACE CLEARANCE WARNING ECU ASSEMBLY

    Click here