Automatic Light Control Sensor: Inspection: Inspection

WARNING: This page is about a different car, the 2011 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT AUTOMATIC LIGHT CONTROL SENSOR

Disconnect the automatic light control sensor connector.

Fig 1: Front View Of 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

Tester Connection	Switch Condition	Specified Condition
F2-1 (CLTB) - F2-3 (CLTE)	Ignition switch off	Below 1 V
F2-1 (CLTB) - F2-3 (CLTE)	Ignition switch ON	11 to 14 V

If the result is not as specified, there is a malfunction on the wire harness side.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
F2-3 (CLTE) - Body ground	Always	Below 1 Ω

If the result is not as specified, there is a malfunction on the wire harness side.

Reconnect the automatic light control sensor connector.

Fig 2: Identifying Automatic Light Control Sensor Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Connect an oscilloscope to the automatic light control sensor connector.

Check the waveform.

Fig 3: Identifying Waveform Graph

Tester Connection	Tool Setting	Switch Condition	Specified Condition
F2-3 (CLTE) - F2-4 (CLTS)	2 V/DIV., 5 ms./DIV	Ignition switch ON, light control switch off	Correct waveform is as shown

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

HINT:

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