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LIGHTING SYSTEM, Diagnostic DTC:B1244

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DTC Code DTC Name
B1244 Light Sensor Circuit Malfunction
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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 automatic light control sensor.

  • Open or short in the light sensor circuit.

  • Automatic light control sensor

  • Harness or connector

  • Main body ECU
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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

    CHECK FOR DTC


    1. Clear the DTC (Click here).

    2. Recheck for DTC (Click here).

      OK
      DTC B1244 is not output.

  2. Click here

    USE SIMULATION METHOD TO CHECKClick here

  3. Click here

    READ VALUE USING INTELLIGENT TESTER (AUTOMATIC LIGHT CONTROL SENSOR)


    1. Operate the intelligent tester according to the display and select "Data List".

      Table 1. Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Illumination Rate Info Illumination rate/min.: 0, max.: 99.99 Actual illumination rate is displayed -
      OK
      Output illuminance is as shown in table above.

  4. Click here

    CHECK MAIN BODY ECU (LIGHT CONTROL SENSOR VOLTAGE)


    1. A0159VDE01

      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) Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V

  5. Click here

    REPLACE MAIN BODY ECU

  6. Click here

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


    1. A015A1BE01

      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

  7. Click here

    REPLACE AUTOMATIC LIGHT CONTROL SENSORClick here

  8. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR