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 (multiplex network body ECU)

WIRING DIAGRAM

A01X3GQE16
*a Automatic Light Control Sensor
*b Main Body ECU (Multiplex Network 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 GTS (AUTOMATIC LIGHT CONTROL SENSOR)


    1. Operate the GTS 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.
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A

    REPLACE MAIN BODY ECU (MULTIPLENETWORK BODY ECU) Click here

    B

    REPLACE MAIN BODY ECU (MULTIPLENETWORK BODY ECU) Click here

    C

  3. CHECK MULTIPLEX NETWORK BODY ECU [MULTIPLEX NETWORK BODY ECU]


    1. A01X1WYE01
      Text in Illustration
      *a

      Component with harness connected

      (Main Body ECU [Multiplex Network Body ECU])

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E118-19 (CLTB) - E118-21 (CLTE) Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE MAIN BODY ECU (MULTIPLENETWORK BODY ECU) Click here

    C

    REPLACE MAIN BODY ECU (MULTIPLENETWORK BODY ECU) Click here

    A

  4. CHECK MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - AUTOMATIC LIGHT CONTROL SENSOR


    1. Disconnect the E118 ECU connector.

    2. Disconnect the F91 sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F91-1 (CLTB) - F118-19 (CLTB) Always Below 1 Ω
      F91-4 (CLTS) - E118-20 (CLTS)
      F91-2 (CLTE) - E118-21 (CLTE)
      F91-1 (CLTB) - Body ground Always 10 kΩ or higher
      F91-4 (CLTS) - Body ground
      F91-2 (CLTE) - Body ground

    OK

    REPLACE AUTOMATIC LIGHT CONTROL SENSOR Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR