LIGHTING (EXT)  AUTOMATIC LIGHT CONTROL SENSOR  ON-VEHICLE INSPECTION  

1.542,0.25 1.875,0.5 0.333,0.25 0.906,1.688 1.406,1.188 true 1.635,1.698 1.615,1.208 true 0.354,0.26 0.667,0.417 0.313,0.156 10 false *a 1.573,0.292 2.031,0.49 0.458,0.198 11 false E74 1.479,1.719 2.094,1.917 0.615,0.198 10 false CLTE 0.708,1.719 1.323,1.917 0.615,0.198 10 false CLTB

*a	Front view of wire harness connector (to Automatic Light Control Sensor)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
Click Location & Routing(E74)Location & Routingewd_type=routing;type=c;code=E74 Click Connector(E74)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Automatic Light Control Sensorewd_type=component;type=c;code=E74;pinno=1,2
E74-1 (CLTB) - E74-2 (CLTE)	Ignition switch on (IG)	11 to 14 V

Standard Resistance:

Tester Connection	Condition	Specified Condition
Click Location & Routing(E74)Location & Routingewd_type=routing;type=c;code=E74 Click Connector(E74)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Automatic Light Control Sensorewd_type=component;type=c;code=E74;pinno=2
E74-2 (CLTE) - Body ground	Always	Below 1 Ω

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

Connect an oscilloscope to terminals E74-2 (CLTE) and E74-4 (CLTS) of the automatic light control sensor connector and check the waveform.

1.688,0.792 2.104,0.979 0.417,0.188 1.156,2.094 1.656,1.677 true 2.323,2.083 1.99,1.667 true 0.521,0.677 0.833,0.833 0.313,0.156 10 false *a 3.5,0.677 3.813,0.833 0.313,0.156 10 false *b 1.771,0.813 2.229,1.01 0.458,0.198 10 false E74 6.375,2.083 6.833,2.281 0.458,0.198 10 false GND 0.958,2.115 1.406,2.313 0.448,0.198 10 false CLTS 2.208,2.115 2.656,2.313 0.448,0.198 10 false CLTE

*a

Component with harness connected (Automatic Light Control Sensor)

*b

Waveform

OK:

Tester Connection	Condition	Tool Setting	Specified Condition
Click Location & Routing(E74)Location & Routingewd_type=routing;type=c;code=E74 Click Connector(E74)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Automatic Light Control Sensorewd_type=component;type=c;code=E74;pinno=2,4
E74-2 (CLTE) - E74-4 (CLTS)	Ignition switch on (IG)	2 V/DIV., 10 ms./DIV.	Pulse generation (See waveform)

HINT:

The communication waveform changes according to the surrounding brightness.

If the result is not as specified, the automatic light control sensor may be malfunctioning.