Dtc B2238 Rear Left Center Sensor Malfunction

Body Electrical. Lexus Is250, Is220D. Gse20 Ale20
Park Assist Monitoring. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT NO. 2 ULTRASONIC SENSOR

CHECK WIRE HARNESS (CLEARANCE WARNING ECU - ULTRASONIC SENSOR)

DTC B2238 Rear Left Center Sensor Malfunction


DESCRIPTION

The No. 2 ultrasonic sensor (rear left center sensor) is installed on the rear bumper.
The clearance warning ECU detects obstacles based on signals received from the rear left center sensor. If the rear left center sensor's circuit has an open, short or other malfunction, it will not function normally.

Lexus Is250, Is220D. Gse20 Ale20.Park Assist Monitoring.Clearance Sonar System. Dtc B2238 Rear Left Center Sensor Malfunction


DTC No.
DTC Detection Condition
Trouble Area
B2238
Malfunction of No. 2 ultrasonic sensor (Rear left center sensor)
  1. No. 2 ultrasonic sensor
  2. Wire harness
  3. Clearance warning ECU

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Park Assist Monitoring.Clearance Sonar System. Dtc B2238 Rear Left Center Sensor Malfunction


INSPECTION PROCEDURE

1.INSPECT NO. 2 ULTRASONIC SENSOR


    Lexus Is250, Is220D. Gse20 Ale20.Park Assist Monitoring.Clearance Sonar System. Dtc B2238 Rear Left Center Sensor Malfunction

  1. Remove the ultrasonic sensor.

  1. Measure the resistance of the sensor.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    S (S3-2) - E (S3-1)
    		Always
    		600 to 1,200 kΩ
    NOTICE:
    Set the tester to the 100 kΩ range before performing the measurement.


NG
REPLACE NO. 2 ULTRASONIC SENSOR (REAR LEFT CENTER SENSOR)
OK


2.CHECK WIRE HARNESS (CLEARANCE WARNING ECU - ULTRASONIC SENSOR)
Lexus Is250, Is220D. Gse20 Ale20.Park Assist Monitoring.Clearance Sonar System. Dtc B2238 Rear Left Center Sensor Malfunction

  1. Disconnect the Q37 ECU connector.

  1. Disconnect the S3 sensor connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    S8 (Q37-3) - S (S3-2)
    		Always
    		Below 1 Ω
    E8 (Q37-16) - E (S3-1)
    		Always
    		Below 1 Ω
    S8 (Q37-3) - Body ground
    		Always
    		10 kΩ or higher
    E8 (Q37-16) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE CLEARANCE WARNING ECU