LIGHTING SYSTEM, Diagnostic DTC:B1244

DTC Code DTC Name
B1244 Light Sensor Circuit Malfunction

DESCRIPTION

This DTC is stored when a failure of the automatic light control sensor circuit is detected.

DTC Code DTC Detection Condition Trouble Area
B1244

When either condition below is met:


  • Malfunction of the light sensor.

  • Open or short of the light sensor circuit.

  • Automatic light control sensor

  • Main body ECU

  • Harness or connector

WIRING DIAGRAM

A01ENMAE06

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B1244 output does not occur.

    NG

    READ VALUE USING INTELLIGENT TESTER (AUTOMATIC LIGHT CONTROL SENSOR) Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  2. READ VALUE USING INTELLIGENT TESTER (AUTOMATIC LIGHT CONTROL SENSOR)


    1. Using the intelligent tester, read the Data List.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Illumination Rate Info Illuminance detected by automatic light control sensor/0 to 235600 lx Illuminance value displayed -
      OK
      Illuminance value is displayed normally.

    NG

    CHECK MAIN BODY ECU (CLTB - CLTE VOLTAGE) Click here

    OK

    REPLACE MAIN BODY ECU

  3. CHECK MAIN BODY ECU (CLTB - CLTE VOLTAGE)

    A01EOVEE01

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E2-20 (CLTB) - E2-18 (CLTE) Engine switch on (IG) 11 to 14 V

    NG

    REPLACE MAIN BODY ECU

    OK

  4. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR)

    A01EQ6AE07

    1. Disconnect the E2 ECU connector.

    2. Disconnect the F9 sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E2-20 (CLTB) - F9-6 (CLTB) Always Below 1 Ω
      E2-19 (CLTS) - F9-5 (CLTS)
      E2-18 (CLTE) - F9-3 (CLTE)
      E2-20 (CLTB) - Body ground Always 10 kΩ or higher
      E2-19 (CLTS) - Body ground
      E2-18 (CLTE) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE AUTOMATIC LIGHT CONTROL SENSOR Click here