B1244

LIGHTING: 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 OPERATION (AUTOMATIC LIGHT CONTROL SENSOR)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch ON (IG) and Techstream ON.
(c) Check that the value of the illumination rate changes in the following range when light contacts the light sensor or when the light sensor is covered.
OK:
0.008 to 0.022 seconds
HINT: This is the time taken for the light sensor to generate one cycle of frequency according to the brightness.

OK -- REPAIR MAIN BODY ECU RH
NG -- Continue to next step.
2. CHECK WIRE HARNESS (ECU - SENSOR)





(a) Disconnect the K67 ECU connector.
(b) Disconnect the L1 sensor connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK AUTOMATIC LIGHT CONTROL SENSOR





(a) Disconnect the L1 sensor connector.
(b) Connect the voltmeter's positive (+) lead to terminal 6 (CLTB) and the negative (-) lead to terminal 3 (CLTE).
(c) Measure the voltage of the connector.
Standard voltage:





(d) Measure the resistance of the connector.
Standard resistance:





(e) Connect the L1 sensor connector.





(f) Check the waveform of the connector.
Standard voltage:





If the ambient light becomes brighter, width A becomes narrower.
If the result is not as specified, replace the automatic light control sensor.
NG -- REPLACE AUTOMATIC LIGHT CONTROL SENSOR
OK -- REPLACE MAIN BODY ECU RH