Dtc B1244 Light Sensor Circuit Malfunction

Vehicle Exterior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Lighting (Ext). Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

READ VALUE USING INTELLIGENT TESTER (AUTOMATIC LIGHT CONTROL SENSOR)

CHECK MAIN BODY ECU (LIGHT CONTROL SENSOR VOLTAGE)

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

DTC 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:
  1. Malfunction of the automatic light control sensor.
  2. Open or short in the light sensor circuit.
  1. Automatic light control sensor
  2. Harness or connector
  3. Main body ECU

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Lighting (Ext).Lighting System. Dtc B1244 Light Sensor Circuit Malfunction


INSPECTION PROCEDURE

1.CHECK FOR DTC

  1. Clear the DTC (Click here).

  1. Recheck for DTC (Click here).

    OK:
    DTC B1244 is not output.


NG
Go to step 2
OK

USE SIMULATION METHOD TO CHECK (Click here)

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.


NG
Go to step 3
OK

REPLACE MAIN BODY ECU

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


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Lighting (Ext).Lighting System. Dtc B1244 Light Sensor Circuit Malfunction

  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)
    		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)
Land Cruiser. Urj200, 202 Grj200 Vdj200.Lighting (Ext).Lighting System. Dtc B1244 Light Sensor Circuit Malfunction

  1. Disconnect the E2 ECU connector.

  1. Disconnect the F9 sensor connector.

  1. 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)