Dtc B2238 Rear Left Center Sensor Malfunction

Body Electrical. Lexus Gs430, Gs300. Uzs190 Grs190
Park Assist Monitoring. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT NO. 2 ULTRASONIC SENSOR

CHECK WIRE HARNESS (CLEARANCE WARNING ECU - NO. 2 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 Gs430, Gs300. Uzs190 Grs190.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 Gs430, Gs300. Uzs190 Grs190.Park Assist Monitoring.Clearance Sonar System. Dtc B2238 Rear Left Center Sensor Malfunction


INSPECTION PROCEDURE

1.INSPECT NO. 2 ULTRASONIC SENSOR


    Lexus Gs430, Gs300. Uzs190 Grs190.Park Assist Monitoring.Clearance Sonar System. Dtc B2238 Rear Left Center Sensor Malfunction

  1. Remove the No. 2 ultrasonic sensor.

  1. Measure the resistance of the sensor.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 (E) - 2 (S)
    		Always
    		900 +- 300 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 - NO. 2 ULTRASONIC SENSOR)
Lexus Gs430, Gs300. Uzs190 Grs190.Park Assist Monitoring.Clearance Sonar System. Dtc B2238 Rear Left Center Sensor Malfunction

  1. Disconnect the A40 ECU connector.

  1. Disconnect the b2 sensor connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A40-13 (S8) - b2-2 (S)
    		Always
    		Below 1 Ω
    A40-29 (ER) - b2-1 (E)
    		Always
    		Below 1 Ω
    A40-13 (S8) - Body ground
    		Always
    		1 MΩ or higher
    A40-29 (ER) - Body ground
    		Always
    		1 MΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE CLEARANCE WARNING ECU