DTC    B2237    Rear Left Sensor Malfunction

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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.

E108068E01


DTC No.
DTC Detection Condition
Trouble Area
B2237
Malfunction of No. 1 ultrasonic sensor (Rear left sensor)
  1. No. 1 ultrasonic sensor
  2. Wire harness
  3. Clearance warning ECU

WIRING DIAGRAM


E107568E05


INSPECTION PROCEDURE

1.INSPECT NO. 1 ULTRASONIC SENSOR


    E107563E01

  1. Remove the No. 1 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. 1 ULTRASONIC SENSOR (REAR LEFT SENSOR)
OK


2.CHECK WIRE HARNESS (CLEARANCE WARNING ECU - NO. 1 ULTRASONIC SENSOR)
E107569E06

  1. Disconnect the A40 ECU connector.

  1. Disconnect the b1 sensor connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A40-11 (S6) - b1-2 (S)
    		Always
    		Below 1 Ω
    A40-29 (ER) - b1-1 (E)
    		Always
    		Below 1 Ω
    A40-11 (S6) - 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