B1244

LIGHTING: LIGHTING SYSTEM: B1244: Light Sensor Circuit Malfunction
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) Check for DTC 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 How To Proceed With Troubleshooting

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

(a) Using the Techstream, read the Data List.

Main Body





OK:

Output illuminance is as shown in table above.

NG -- CHECK MAIN BODY ECU (CLTB - CLTE VOLTAGE)

OK -- REPLACE MAIN BODY ECU

3. CHECK MAIN BODY ECU (CLTB - CLTE VOLTAGE)





(a) 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 L12 ECU connector.

(b) Disconnect the M2 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 Removal