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 front bumper. The ECU 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. DTC Detection Condition Trouble Area
C1AE9 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

A01G8E3E08

INSPECTION PROCEDURE

Note

If DTCs are output after repairs, turn the engine switch on (IG) and turn the clearance sonar main switch on. Then clear the DTCs Click here.

PROCEDURE


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


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

    2. A01G5KQE01
      Text in Illustration
      *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

    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 V4 No. 1 ultrasonic sensor (rear right sensor) connector.

    2. Disconnect the H61 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
      V4-2 (S) - H61-1 (S1) Always Below 1 Ω
      V4-1 (E) - H61-2 (E1) Always Below 1 Ω
      V4-2 (S) - Body ground Always 10 kΩ or higher
      V4-1 (E) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    B

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    C

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR