On-Vehicle Inspection

WARNING: This page is about a different car, the 2008 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT AUTOMATIC LIGHT CONTROL SENSOR

Connect the voltmeter's positive (+) lead to terminal K19-6 (CLTB) and the negative (-) lead to terminal K19-3 (CLTE).

Fig 1: Identifying Automatic Light Control Sensor Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard voltage

K19-6 (CLTB)TO TERMINAL K19-3 (CLTE)

Tester Connection	Switch Condition	Specified Condition
K19-6 (CLTB) - K19-3 (CLTE)	Ignition switch ON	11 to 14 V

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

Standard resistance

AUTOMATIC LIGHT CONTROL SENSOR

Tester Connection	Switch Condition	Specified Condition
K19-3 (CLTE) - Body ground	Always	Below 1 Ω

Reconnect the K19 sensor connector.

Check the waveform according to the value(s) in the table below.

Fig 2: Identifying Automatic Light Control Sensor Waveform Graph

Waveform

AUTOMATIC LIGHT CONTROL SENSOR RECONNECT

Tester Connection	Tool Setting	Switch Condition	Specified Condition
K19-3 (CLTE) -K19-5 (CUTS)	5 V/DIV., 5 msec./ DIV.	Ignition switch ON, Headlight dimmer switch AUTO	Correct waveform is as shown

HINT:

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

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