Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VKET
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: WIPER / WASHER: WIPER AND WASHER SYSTEM(w/ Rain Sensor): Wiper and Washer Switch Circuit; 2016 - 2020 MY Sienna [12/2015 -        ]

Wiper and Washer Switch Circuit

DESCRIPTION

This circuit detects the state of the windshield wiper switch assembly (front wiper switch and front washer switch) and sends it to the windshield wiper relay assembly.

WIRING DIAGRAM

PROCEDURE

1.

INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY

(a) Remove the windshield wiper switch assembly (See page 2016 - 2020 MY Sienna [12/2015 -        ]; WIPER / WASHER: WIPER SWITCH: REMOVAL ).

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

Standard Resistance:

Front Wiper Switch

Tester Connection

Switch Condition

Specified Condition

D23-3 (+1) - D23-1 (+S)

OFF

Below 1 Ω

D23-3 (+1) - D23-2 (+B)

MIST

LO

D23-2 (+B) - D23-4 (+2)

HI

D23-9 (AUTO) - D23-10 (E)

AUTO

D23-3 (+1) - D23-1 (+S)

Front Washer Switch

Tester Connection

Switch Condition

Specified Condition

D25-2 (EW) - D25-3 (WF)

ON

Below 1 Ω

OFF

10 kΩ or higher

Adjusting Ring*1

Tester Connection

Condition

Specified Condition

D23-7 (VR1) - D23-8 (VR2)

Adjusting ring changed from (+) side to (-) side

0 to 2.7 kΩ

HINT:

*1: The rain sensor sensitivity can be adjusted by the windshield wiper switch adjusting ring.

Text in Illustration

*a

Component without harness connected

(Windshield Wiper Switch Assembly)

NG

REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY

OK

2.

CHECK HARNESS AND CONNECTOR (WIPER SWITCH - WIPER RELAY AND BODY GROUND)

(a) Disconnect the D23 and D25 windshield wiper switch assembly connectors.

Text in Illustration

*a

Front view of wire harness connector

(to Windshield Wiper Switch Assembly)

*b

Front view of wire harness connector

(to Windshield Wiper Relay Assembly)

(b) Disconnect the D78 windshield wiper relay assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D23-3 (+1) - D78-1 (+2S)

Always

Below 1 Ω

D23-3 (+1) - Body ground

Always

10 kΩ or higher

D23-4 (+2) - D78-3 (+2)

Always

Below 1 Ω

D23-4 (+2) - Body ground

Always

10 kΩ or higher

D23-1 (+S) - D78-11 (+SSW)

Always

Below 1 Ω

D23-1 (+S) - Body ground

Always

10 kΩ or higher

D23-9 (AUTO) - D78-17 (C1)

Always

Below 1 Ω

D23-9 (AUTO) - Body ground

Always

10 kΩ or higher

D23-10 (E) - D78-16 (C0)

Always

Below 1 Ω

D23-10 (E) - Body ground

Always

10 kΩ or higher

D23-7 (VR1) - D78-7 (VR1)

Always

Below 1 Ω

D23-7 (VR1) - Body ground

Always

10 kΩ or higher

D23-8 (VR2) - D78-6 (VR2)

Always

Below 1 Ω

D23-8 (VR2) - Body ground

Always

10 kΩ or higher

D25-2 (EW) - Body ground

Always

Below 1 Ω

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR