Toyota Prius: Rain Sensor

On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT RAIN SENSOR

Pre-procedure1

(a) Disconnect the rain sensor connector.

Procedure1

(b) Measure the voltage according to the value(s) in the table below. Standard Voltage: Click Location & Routing(U4) Click Connector(U4) Tester Connection Condition Specified Condition Result U4-4(SIG) - U4-2(ES) IG OFF Below 1 V V U4-4(SIG) - U4-2(ES) IG ON 11 to 14 V V

*a Front view of wire harness connector (to Rain Sensor)

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

Standard Resistance:

Click Location & Routing(U4) Click Connector(U4)

Tester Connection	Condition	Specified Condition	Result
U4-2(ES) - Body ground	Always	Below 1 Ω	Ω

Post-procedure1

(d) Reconnect the rain sensor connector.

*a Component with harness connected (Rain Sensor)

Procedure2

(e) Connect an oscilloscope to the rain sensor connector.

OK:

Click Location & Routing(U4) Click Connector(U4)

Tester Connection	Condition	Specified Condition
U4-3(MPX) - U4-2(ES)	Ignition switch ON Front wiper switch Auto	Pulse generation

HINT:

If the result is not as specified, replace the rain sensor.

Installation

INSTALLATION

CAUTION / NOTICE / HINT

COMPONENTS (INSTALLATION)

Procedure		Part Name Code
1	RAIN SENSOR TAPE	89944		-	-
2	RAIN SENSOR	89941		-	-
3	RAIN SENSOR COVER	89943	-	-	-

PROCEDURE

1. INSTALL RAIN SENSOR TAPE

(1) Remove the rain sensor tape.

(2) Clean the rain sensor sensing portion with a piece of cloth.

(3) Peel off the smaller release sheet, and then attach the new rain sensor tape to the rain sensor sensing portion as shown in the illustration.

HINT:

Use your fingers to push out any air bubbles from under the tape.

Standard Clearance

Area	Measurement	Area	Measurement
A	21.8 mm (0.858 in.)	B	7.25 mm (0.285 in.)

2. INSTALL RAIN SENSOR

NOTICE: Make sure that there is no rain sensor tape residue remaining on the windshield glass. If there is, remove the residue. If there is any rain sensor tape residue remaining on the windshield glass, replace the tape.

*a	Stopper	-	-
	Push		Install in this Direction

(1) Clean the windshield glass with a piece of cloth.

(2) When installing a new rain sensor or when the rain sensor tape has been replaced:

1. Peel off the release sheet.

HINT:

Do not touch the silicone surface.

(3) Gradually attach the rain sensor to the windshield glass surface in the direction indicated by the arrow shown in the illustration to prevent air bubbles from forming between them.

(4) Push in the stopper to install the rain sensor as shown in the illustration.

(5) Connect the connector.

3. INSTALL RAIN SENSOR COVER