Dtc B1244 Light Sensor Circuit Malfunction

Body Electrical. Camry. Acv40 Gsv40
Lighting. Camry. Acv40 Gsv40

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER

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

INSPECT MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY )

INSPECT AUTOMATIC LIGHT CONTROL SENSOR

DTC B1244 Light Sensor Circuit Malfunction


DESCRIPTION

The automatic light control sensor detects ambient light, converts it into an electrical signal, and outputs it to the main body ECU. The main body ECU turns on or off the headlights and taillights according to the signal.

DTC No.
DTC Detecting Condition
Trouble Area
B1244
  1. Malfunction in automatic light control sensor
  2. Open or short in automatic light control sensor circuit
  1. Automatic light control sensor
  2. Harness or connector
  3. Main body ECU (Instrument panel J/B)

WIRING DIAGRAM


Camry. Acv40 Gsv40.Lighting.Lighting System. Dtc B1244 Light Sensor Circuit Malfunction


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to the ON position and turn the intelligent tester main switch on.

  1. Select the item below in the DATA LIST, and read the display on the intelligent tester.

    Main Body (Main Body ECU):
    Item
    		Measurement Item / Display (Range)
    		Normal Condition
    		Diagnostic Note
    Illumination Rate Info
    		Illumination rate information / 0 ms. to 99.99 ms.
    		0.8 ms. to 22.0 ms. (Value is output according to ambient illuminance)
    		-
    OK:
    Normal condition listed above is displayed.


OK
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
NG


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


    Camry. Acv40 Gsv40.Lighting.Lighting System. Dtc B1244 Light Sensor Circuit Malfunction

  1. Disconnect the E11 automatic light control sensor connector.

  1. Disconnect the E6 main body ECU connector.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E6-18 (CLTE) - E11-3 (CLTE)
    		Always
    		Below 1 Ω
    E6-19 (CLTS) - E11-5 (CLTS)
    		Always
    		Below 1 Ω
    E6-20 (CLTB) - E11-6 (CLTB)
    		Always
    		Below 1 Ω
    E6-18 (CLTE) - Body ground
    		Always
    		10 kΩ or higher
    E6-19 (CLTS) - Body ground
    		Always
    		10 kΩ or higher
    E6-20 (CLTB) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY )

  1. Reconnect the main body ECU connector.



    Camry. Acv40 Gsv40.Lighting.Lighting System. Dtc B1244 Light Sensor Circuit Malfunction

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

    Standard voltage:
    Tester Connection
    		 Condition
    		Specified Condition
    E11-6 (CLTB) - E11-3 (CLTE)
    		Ignition switch off
    		Below 1 V
    E11-6 (CLTB) - E11-3 (CLTE)
    		Ignition switch ON
    		10 to 14 V
    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E11-3 (CLTE) - Body ground
    		Always
    		Below 1 Ω


NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
OK


4.INSPECT AUTOMATIC LIGHT CONTROL SENSOR


    Camry. Acv40 Gsv40.Lighting.Lighting System. Dtc B1244 Light Sensor Circuit Malfunction

  1. Reconnect the automatic light control sensor connector.

  1. Connect an oscilloscope to the automatic light control sensor connector.



    Camry. Acv40 Gsv40.Lighting.Lighting System. Dtc B1244 Light Sensor Circuit Malfunction

  1. Check the waveform.

    OK:
    Tester Connection
    		Tool Setting
    		 Condition
    		Specified Condition
    E11-3 (CLTE) - E11-5 (CLTS)
    		5 V/DIV., 5 ms./DIV.
    		Ignition switch ON, light control switch in AUTO
    		Correct waveform is as shown
    HINT:
    If the ambient light becomes brighter, width A becomes narrower.


NG
REPLACE AUTOMATIC LIGHT CONTROL SENSOR
OK

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY