Toyota Yaris: Wiper And Washer System / Wiper and Washer Switch Circuit

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Vehicle Exterior / Wiper / Washer / Wiper And Washer System / Wiper and Washer Switch Circuit

DESCRIPTION

The condition of the windshield wiper switch assembly is detected and sent to the steering sensor in this circuit.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the main body ECU (multiplex network body ECU) is replaced, refer to the Registration.

Click here

PROCEDURE

1.

READ VALUE USING GTS (STEERING ANGLE SENSOR)

(a) Read the Data List according to the display on the GTS.

HINT:

Refer to Inspection for each position of the switch.

Click here

Chassis > Steering Angle Sensor > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Wiper OFF Switch

Front wiper switch OFF position signal

OFF or ON

OFF: Front wiper switch not in OFF position

ON: Front wiper switch in OFF position

-

Wiper Auto/Int Switch

Front wiper switch INT position signal

OFF or ON

OFF: Front wiper switch not in INT position

ON: Front wiper switch in INT position

-

Wiper Lo Switch

Front wiper switch LO position signal

OFF or ON

OFF: Front wiper switch not in LO position

ON: Front wiper switch in LO position

-

Wiper Hi Switch

Front wiper switch HI position signal

OFF or ON

OFF: Front wiper switch not in HI position

ON: Front wiper switch in HI position

-

Wiper Mist Switch

Front wiper switch MIST position signal

OFF or ON

OFF: Front wiper switch not in MIST position

ON: Front wiper switch in MIST position

-

Washer Switch

Washer switch Fr WASH position signal

OFF or ON

OFF: Washer switch not in Fr WASH position

ON: Washer switch in Fr WASH position

-

Chassis > Steering Angle Sensor > Data List

Tester Display

Wiper OFF Switch

Wiper Auto/Int Switch

Wiper Lo Switch

Wiper Hi Switch

Wiper Mist Switch

Washer Switch

OK:

The GTS display changes correctly in response to the windshield wiper switch assembly operation.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY

Click here

NG

REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY

OK

3.

INSPECT STEERING WHEEL SWITCH HOUSING

Click here

NG

REPLACE STEERING WHEEL SWITCH HOUSING

OK

4.

CHECK HARNESS AND CONNECTOR (STEERING SENSOR - WINDSHIELD WIPER RELAY ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the A49 windshield wiper relay Assembly connector.

(b) Disconnect the H4 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H39-2 (2S) - A49-3 (2S)

Always

Below 1 Ω

H39-2 (2S) or A49-3 (2S) - Body ground

Always

10 kΩ or higher

H39-2 (2S) - H4-12 (WHI)

Always

Below 1 Ω

H39-2 (2S) or H4-12 (WHI) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY)

(a) Connect the A49 windshield wiper relay assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H39-2 (2S) - Body ground

Always

10 kΩ or higher

NG

REPLACE WINDSHIELD WIPER RELAY ASSEMBLY

OK

6.

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Disconnect the A49 windshield wiper relay assembly connector.

(b) Connect the H4 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H39-2 (2S) - Body ground

Always

10 kΩ or higher

OK

REPLACE STEERING SENSOR

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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