B1244

LIGHTING SYSTEM: B1244: Light Sensor Circuit Malfunction

DTC B1244 - Light Sensor Circuit Malfunction

DESCRIPTION

This DTC is output when a failure of the automatic light control sensor circuit is detected.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC
(a) Clear the DTC (Reading and Clearing Diagnostic Trouble Codes).
(b) Recheck for DTC (Reading and Clearing Diagnostic Trouble Codes).
OK:
DTC B1244 is not output.
NG -- READ VALUE USING TECHSTREAM (AUTOMATIC LIGHT CONTROL SENSOR)
OK -- USE SIMULATION METHOD TO CHECK
2. READ VALUE USING TECHSTREAM (AUTOMATIC LIGHT CONTROL SENSOR)
(a) Operate the Techstream according to the display and select "Data List".

Main Body





OK:
Output illuminance is as shown in table above.
NG -- CHECK MAIN BODY ECU (LIGHT CONTROL SENSOR VOLTAGE)
OK -- REPLACE MAIN BODY ECU
3. CHECK MAIN BODY ECU (LIGHT CONTROL SENSOR VOLTAGE)





(a) Disconnect the J3 ECU connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:





NG -- REPLACE MAIN BODY ECU
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR)





(a) Disconnect the J3 ECU connector.
(b) Disconnect the K19 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 -- REPLACE AUTOMATIC LIGHT CONTROL SENSOR