Lexus IS250 · Service Manual BODY ELECTRICAL

ON-VEHICLE INSPECTION

Inspection


INSPECT AUTOMATIC LIGHT CONTROL SENSOR

B109993E07

  1. Disconnect the K1 sensor connector.

  1. Connect the voltmeter's positive (+) lead to terminal 6 and the negative (-) lead to terminal 3.

  1. Measure the voltage of the connector.

    Standard voltage:
    Tester Connection
    		 Condition
    		 Specified Condition
    K1-3 (CTLE) - K1-6 (CTLB)
    		 Engine switch on (IG)
    		 10 to 14 V

  1. Measure the resistance of the connector.

    Standard resistance:
    Tester Connection
    		 Condition
    		 Specified Condition
    K1-3 (CTLE) - Body ground
    		 Always
    		 Below 1 Ω

  1. Reconnect the K1 sensor connector.

  1. B107499E04
    Check the waveform of the K1 sensor connector.

    Tester Connection
    		 Condition
    		 Specified Condition
    		 Tester Range
    K1-3 (CTLE) - K1-5 (CTLS)
    		 Engine switch on (IG), Headlight dimmer switch in AUTO
    		 Correct waveform is as shown
    		 5 V/DIV., 5 msec./DIV.

    HINT:
    If the ambient light becomes brighter, width A becomes narrower.

    If the result is not as specified, replace the automatic light control sensor.

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