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 automatic light control sensor.

  • Open or short in the light sensor circuit.

  • Automatic light control sensor

  • Harness or connector

  • Main body ECU

WIRING DIAGRAM

A01X4R6E13
*a Automatic Light Control Sensor
*b Main Body ECU

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTC Click here.

    2. Recheck for DTC Click here.

      OK
      DTC B1244 is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

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


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

      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.

    OK

    REPLACE MAIN BODY ECU

    NG

  3. CHECK MAIN BODY ECU (LIGHT CONTROL SENSOR VOLTAGE)


    1. A01XAC3E01
      *1 Component with harness connected: (Main Body ECU)

      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

    NG

    REPLACE MAIN BODY ECU

    OK

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


    1. A01X6MBE01
      *1 Front view of wire harness connector: (to Main Body ECU)
      *2 Front view of wire harness connector: (to Automatic Light Control Sensor)

      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

    OK

    REPLACE AUTOMATIC LIGHT CONTROL SENSOR Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR