On-Vehicle Inspection

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT AUTOMATIC LIGHT CONTROL SENSOR

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

Tester Connection	Switch Condition	Specified Condition
M2-6 (CLTB) - M2-3 (CLTE)	Power switch ON (IG)	11 to 14 V

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

Fig 1: Identifying Automatic Light Control Sensor Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

WAVEFORM REFERENCE CHART

Tester Connection	Condition	Specified Condition
M2-3 (CLTE) - Body ground	Always	Below 1 Ω

Reconnect the M2 sensor connector.

Check the waveform of the M2 sensor connector.

Waveform

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

Tester Connection	Tool Setting	Switch Condition	Specified Condition
M2-3 (CLTE) - M2-5 (CLTS)	5 V/DIV., 5 msec./ DIV.	Power switch ON (IG), Headlight dimmer switch on AUTO	Correct waveform is as shown

Fig 2: Waveform Graph

HINT:

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

If the result is not as specified, there may be a malfunction on the sensor