B1244

LIGHTING (EXT): 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. INSPECT 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 illumination is as shown in table above.

NG -- INSPECT AUTOMATIC LIGHT CONTROL SENSOR (SYSTEM VOLTAGE)
OK -- REPLACE MAIN BODY ECU
3. INSPECT AUTOMATIC LIGHT CONTROL SENSOR (SYSTEM VOLTAGE)




(a) Disconnect the I21 automatic light control sensor connector.
(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





(c) Reconnect the automatic light control sensor connector.

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




(a) Disconnect the H3 main body ECU connector.
(b) Disconnect the I21 automatic light control sensor connector.
(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(d) Reconnect the automatic light control sensor connector.
(e) Reconnect the main body ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU