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. CLEAR DTC

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

NEXT -- Continue to next step.

2. CHECK DTC

(a) 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 -- NORMAL

3. 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

4. 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.

5. 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