B1244

LIGHTING (EXT): LIGHTING SYSTEM: B1244: Light Sensor Circuit Malfunction
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 the headlights and taillights on or off according to the signal.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B1244 output does not occur.

NG -- READ VALUE USING TECHSTREAM (AUTOMATIC LIGHT CONTROL SENSOR)

OK -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure

2. READ VALUE USING TECHSTREAM (AUTOMATIC LIGHT CONTROL SENSOR)

(a) Using the Techstream, read the Data List Data List / Active Test.

Main Body

OK:

Normal condition listed above is displayed.

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

OK -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Removal

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

(a) Disconnect the G47 main body ECU connector.

(b) Disconnect the H19 automatic light control sensor connector.

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

Standard Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Remove the driver side junction block with its connectors still connected Removal.

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

Standard Voltage:

Text in Illustration

NG -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Removal
OK -- Continue to next step.

5. CHECK AUTOMATIC LIGHT CONTROL SENSOR

(a) Remove the automatic light control sensor with its connector still connected Removal.

(b) Connect an oscilloscope to the automatic light control sensor connector.

Text in Illustration

HINT
When the ambient light becomes brighter, width A becomes narrower.

NG -- REPLACE AUTOMATIC LIGHT CONTROL SENSOR Removal

OK -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Removal