TOYOTA PARKING ASSIST-SENSOR SYSTEM(w/ Simple Intelligent Parking Assist System), Diagnostic DTC:C1AE1

DTC Code DTC Name
C1AE1 Front Left Sensor Malfunction

DESCRIPTION

The front corner ultrasonic sensor (LH) is installed on the front bumper. The ECU detects obstacles based on signals received from the front corner ultrasonic sensor (LH). If the front corner ultrasonic sensor (LH) has an open circuit or other malfunction, it will not function normally.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1AE1 Front Left Sensor Malfunction

Either condition is met (1 trip detection logic*):


  • A malfunction of the front corner ultrasonic sensor (LH)

  • A short or open in the harness or connector

  • Front corner ultrasonic sensor (LH)

  • Harness or connector

  • Clearance warning ECU assembly

DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3
Diagnosis Condition Ignition switch ON ○ ○ ○
Malfunction Status A malfunction of the front corner ultrasonic sensor (LH) ○ - -
A short in the harness or connector - ○ -
An open in the harness or connector - - ○
Detection Time - - -
Number of Trips 1 trip 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

A001X4ME96
*a Clearance Warning ECU Assembly
*b Front Corner Ultrasonic Sensor (LH)

CAUTION / NOTICE / HINT

Note


  • If DTCs are output after repairs, turn the ignition switch ON and the TOYOTA parking assist-sensor system 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 Calibration.

    Click here

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - FRONT CORNER ULTRASONIC SENSOR (LH))


    1. Disconnect the F37 clearance warning ECU assembly connector.

    2. Disconnect the B1 front corner ultrasonic sensor (LH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F37-6 (E5) - B1-1 (EI) Always Below 1 Ω
      F37-5 (BOF) - B1-3 (BI) Always Below 1 Ω
      F37-2 (S6) - B1-2 (SI) Always Below 1 Ω
      F37-6 (E5) - F37-2 (S6) Always 10 kΩ or higher
      F37-5 (BOF) - F37-2 (S6) Always 10 kΩ or higher
      F37-6 (E5) - F37-5 (BOF) Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. REPLACE FRONT CORNER ULTRASONIC SENSOR (LH)


    1. Replace the front corner ultrasonic sensor (LH) with a known good one.

      Click here

      Tech Tips

      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

  3. CHECK DTC OUTPUT


    1. Clear the DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes
      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    OK

    END (FRONT CORNER ULTRASONIC SENSOR (LH) WAS DEFECTIVE)

    NG

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here