Lexus IS250 · Service Manual BODY ELECTRICAL

B2237

Diagnostic trouble codes

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.
E123647E01
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

E123645E05

INSPECTION PROCEDURE


1. INSPECT NO. 1 ULTRASONIC SENSOR

  1. E111617E01
    Remove the ultrasonic sensor.

  1. Measure the resistance of the sensor.

    Standard resistance:
    Tester Connection
    		 Condition
    		 Specified Condition
    S (S1-2) - E (S1-1)
    		 Always
    		 600 to 1,200 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 - ULTRASONIC SENSOR)
E123646E04

  1. Disconnect the Q37 ECU connector.

  1. Disconnect the S1 sensor connector.

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

    Standard resistance:
    Tester Connection
    		 Condition
    		 Specified Condition
    S6 (Q37-4) - S (S1-2)
    		 Always
    		 Below 1 Ω
    E6 (Q37-17) - E (S1-1)
    		 Always
    		 Below 1 Ω
    S6 (Q37-4) - Body ground
    		 Always
    		 10 kΩ or higher
    E6 (Q37-17) - Body ground
    		 Always
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE CLEARANCE WARNING ECU


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