Toyota Prius: Automatic Light Control Sensor

On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT AUTOMATIC LIGHT CONTROL SENSOR

Pre-procedure1

(a) Disconnect the G1 automatic light control sensor connector.

Procedure1

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

Standard Voltage:

Click Location & Routing(G1) Click Connector(G1)

Tester Connection	Condition	Specified Condition	Result
G1-1 (CLTB) - G1-2 (CLTE)	Ignition switch off	Below 1 V	V
G1-1 (CLTB) - G1-2 (CLTE)	Ignition switch on (IG)	11 to 14 V	V

Standard Resistance:

Click Location & Routing(G1) Click Connector(G1)

Tester Connection	Condition	Specified Condition	Result
G1-2 (CLTE) - Body ground	Always	Below 1 Ω	Ω

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

Post-procedure1

(c) Connect the G1 automatic light control sensor connector.

Procedure2

(d) Connect an oscilloscope to terminals G1-2 (CLTE) and G1-4 (CLTS) of the automatic light control sensor connector and check the waveform.

*a

Component with harness connected (Automatic Light Control Sensor)

*b

Waveform

OK:

Click Location & Routing(G1) Click Connector(G1)

Tester Connection	Condition	Tool Setting	Specified Condition
G1-2 (CLTE) - G1-4 (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.

Removal

REMOVAL

CAUTION / NOTICE / HINT

COMPONENTS (REMOVAL)

Procedure		Part Name Code
1	INSTRUMENT PANEL SAFETY PAD SUB-ASSEMBLY	-	-	-	-
2	AUTOMATIC LIGHT CONTROL SENSOR	89120A	-	-	-

PROCEDURE

1. REMOVE INSTRUMENT PANEL SAFETY PAD SUB-ASSEMBLY

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2. REMOVE AUTOMATIC LIGHT CONTROL SENSOR

Installation

INSTALLATION

CAUTION / NOTICE / HINT

COMPONENTS (INSTALLATION)

Procedure		Part Name Code
1	AUTOMATIC LIGHT CONTROL SENSOR	89120A	-	-	-
2	INSTRUMENT PANEL SAFETY PAD SUB-ASSEMBLY	-	-	-	-

PROCEDURE

1. INSTALL AUTOMATIC LIGHT CONTROL SENSOR

2. INSTALL INSTRUMENT PANEL SAFETY PAD SUB-ASSEMBLY

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