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 on or off the headlights and taillights 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 Exterior Lighting System.
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 F9 main body ECU connector.
(b) Disconnect the G2 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) Reconnect the F9 main body ECU connector.
(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) Reconnect the G2 automatic light control sensor connector.
(b) Connect an oscilloscope to the automatic light control sensor connector.
(c) Check the waveform.
OK:
Text in Illustration
HINT
If 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