On-Vehicle Inspection

INSPECT AUTOMATIC LIGHT CONTROL SENSOR

Disconnect the K1 sensor connector.
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 SPECIFIED CONDITION CHART

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

Fig 1: Identifying K1 Sensor Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value (s) in the table below.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

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

Check the waveform of the K1 sensor connector.

TESTER CONNECTION SPECIFIED CONDITION CHART

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 ms./ DIV.

Fig 2: Identifying Waveform (K1 Sensor)

HINT:

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

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