LEXUS PARKING ASSIST-SENSOR SYSTEM, Diagnostic DTC:B2237

DTC Code DTC Name
B2237 Rear Left Sensor Malfunction

DESCRIPTION

The No. 1 ultrasonic sensor (rear left sensor) is installed on the rear bumper.

The clearance warning ECU detects obstacles based on signals received from the rear left sensor. If the rear left sensor's circuit has an open, short or other malfunction, it will not function normally.

A0160VCE01
DTC No. DTC Detection Condition Trouble Area
B2237 Malfunction of No. 1 ultrasonic sensor (Rear left sensor)

  • No. 1 ultrasonic sensor (Rear left sensor)

  • Harness or connector between clearance warning ECU and No. 1 ultrasonic sensor (Rear left sensor)

  • Clearance warning ECU

WIRING DIAGRAM

A0160PZE11

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT NO. 1 ULTRASONIC SENSOR


    1. A015ZYBE04

      Remove the No. 1 ultrasonic sensor.

    2. Disconnect the No. 1 ultrasonic sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S1-2 (S) - S1-1 (E) Always 600 to 1200 kΩ

      Note

      Set the tester to the 100 kΩ range before performing the measurement.


    NG

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

    OK

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


    1. A0163KRE03

      Disconnect the clearance warning ECU connector.

    2. A016328E03

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q37-4 (S6) - S1-2 (S) Always Below 1 Ω
      Q37-17 (E6) - S1-1 (E) Always Below 1 Ω
      Q37-4 (S6) - Body ground Always 10 kΩ or higher
      Q37-17 (E6) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK (When troubleshooting according to the Problem Symptoms Table) B
      OK (When troubleshooting according to the DTC) C

    B

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    REPLACE CLEARANCE WARNING ECU Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR