Lexus IS250 IS220d GSE20 ALE20 - LIGHTING
CHECK AUTOMATIC LIGHT CONTROL SENSOR (OPERATION)
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - AUTOMATIC LIGHT CONTROL SENSOR)
CHECK AUTOMATIC LIGHT CONTROL SENSOR
DTC B1244 Light Sensor Circuit Malfunction
DESCRIPTION
This DTC is output when a failure of the automatic light control sensor circuit is detected.
| DTC No. | DTC Detection Condition | Trouble Area |
| B1244 | Malfunction of automatic light control sensor Open or short in automatic light control sensor circuit | Automatic light control sensor Wire harness or connector Main body ECU RH (Cowl side J/B RH) |
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.CHECK AUTOMATIC LIGHT CONTROL SENSOR (OPERATION) |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the intelligent tester main switch on.
Select the "DATA LIST" on the intelligent tester.
| Item | Measurement Item / Display (Range) | Normal Condition |
| Illumination Rate Info | Illumination information / 10 to 99.99 ms | 0.8 to 22 ms |
The value of the illumination rate should change in the following range when light shines on the automatic light control sensor or when the automatic light control sensor is covered.
- OK:
- 0.8 to 22 ms
- HINT:
- This is the time taken for the automatic light control sensor to generate one cycle of frequency according to the brightness.
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| NG | |
| 2.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - AUTOMATIC LIGHT CONTROL SENSOR) |
Disconnect the J74 main body ECU RH connector.
Disconnect the K1 automatic light control sensor connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection Condition Specified Condition J74-6 (CLTB) - K1-6 (CLTB) Always Below 1 Ω J74-5 (CLTS) - K1-5 (CLTS) Always Below 1 Ω J74-4 (CLTE) - K1-3 (CLTE) Always Below 1 Ω J74-6 (CLTB) - Body ground Always 10 kΩ or higher J74-5 (CLTS) - Body ground Always 10 kΩ or higher J74-4 (CLTE) - Body ground Always 10 kΩ or higher
Connect the 2 connectors.
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| OK | |
| 3.CHECK AUTOMATIC LIGHT CONTROL SENSOR |
Disconnect the automatic light control sensor.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection Condition Specified Condition K1-3 (CLTE) - Body ground Always Below 1 Ω
Connect the voltmeter's positive (+) lead to terminal 6 and the negative (-) lead to terminal 3.
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
Tester Connection Condition Specified Condition K1-3 (CLTE) - K1-6 (CLTB) Engine switch on (IG) 10 to 14 V
Connect the K1 automatic light control sensor connector.
Connect the oscilloscope and check the waveform according to the table below.
- Standard voltage:
Tester Connection Condition Specified Condition Tester Range K1-3 (CLTE) - K1-5 (CLTS) Engine switch on (IG), Headlight dimmer switch in AUTO Correct waveform is as shown 5 V Division, 5 msec/Division
If the ambient light becomes brighter, width A becomes narrower.
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| OK | ||
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