LEXUS PARKING ASSIST-SENSOR SYSTEM, Diagnostic DTC:C1AE9

DTC Code DTC Name
C1AE9 Rear Right Sensor Malfunction

DESCRIPTION

The No. 1 ultrasonic sensor (rear right sensor) is installed on the rear bumper. The clearance warning ECU assembly detects obstacles based on signals received from the No. 1 ultrasonic sensor (rear right sensor). If the No. 1 ultrasonic sensor (rear right sensor) has an open circuit or other malfunction, it will not function normally.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1AE9 Rear Right Sensor Malfunction A malfunction of the No. 1 ultrasonic sensor (rear right sensor)

  • No. 1 ultrasonic sensor (rear right sensor)

  • Harness or connector

  • Clearance warning ECU assembly

WIRING DIAGRAM

A0022ZCE35

CAUTION / NOTICE / HINT

Note

If DTCs are output after repairs, turn the power switch on (IG) and turn the back sonar or clearance sonar switch assembly on. Then clear the DTCs.

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PROCEDURE


  1. INSPECT NO. 1 ULTRASONIC SENSOR (REAR RIGHT SENSOR)


    1. Remove the No. 1 ultrasonic sensor (rear right sensor).

      Click here

    2. A0022YBC02
      *a

      Component without harness connected

      (No. 1 Ultrasonic Sensor (Rear Right Sensor))

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

      Standard Resistance:
      Tester Connection Condition Specified Condition
      2 (S) - 1 (E) Always 20 to 40 kΩ
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  2. CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR (REAR RIGHT SENSOR) - CLEARANCE WARNING ECU ASSEMBLY)


    1. Disconnect the K44 clearance warning ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U1-2 (S) - K44-1 (S1) Always Below 1 Ω
      U1-1 (E) - K44-2 (E1) Always Below 1 Ω
      U1-2 (S) - Body ground Always 10 kΩ or higher
      U1-1 (E) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CLEARANCE WARNING ECU ASSEMBLY for LHD: Click here
    REPLACE CLEARANCE WARNING ECU ASSEMBLY for RHD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR