Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VKFB
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: WIPER / WASHER: WIPER SWITCH: INSPECTION; 2016 - 2020 MY Sienna [12/2015 -        ]

INSPECTION

PROCEDURE

1. INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY (w/ Rain Sensor)

(a) Check the front wiper switch.

Text in Illustration

*a

Component without harness connected

(Windshield Wiper Switch Assembly)

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

A-1 (+S) - A-3 (+1)

OFF

Below 1 Ω

A-9 (AUTO) - A-10 (E)

AUTO

A-1 (+S) - A-3 (+1)

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

MIST

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

LO

A-2 (+B) - A-4 (+2)

HI

If the result is not as specified, replace the windshield wiper switch assembly.

(b) Check the front washer switch.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

B-2 (EW) - B-3 (WF)

ON

Below 1 Ω

OFF

10 kΩ or higher

If the result is not as specified, replace the windshield wiper switch assembly.

(c) Check the rain sensor adjust switch.

Text in Illustration

*1

Rain Sensor Adjust Switch

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

A-7 (VR1) - A-8 (VR2)

Rain sensor adjust switch maximum to minimum position

0 to 2.7 KΩ

If the result is not as specified, replace the windshield wiper switch assembly.

(d) Check the rear wiper switch.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

B-2 (EW) - B-6 (C1R)

OFF

10 kΩ or higher

B-2 (EW) - B-7 (+1R)

B-2 (EW) - B-6 (C1R)

LO

Below 1 Ω

B-2 (EW) - B-7 (+1R)

HI

If the result is not as specified, replace the windshield wiper switch assembly.

(e) Check the rear washer switch.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

A-5 (WR) - B-2 (EW)

OFF

10 kΩ or higher

B-2 (EW) - B-7 (+1R)

A-5 (WR) - B-2 (EW)

WASH

Below 1 Ω

A-5 (WR) - B-2 (EW)

ON + WASH

B-2 (EW) - B-7 (+1R)

If the result is not as specified, replace the windshield wiper switch assembly.

2. INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY (w/o Rain Sensor)

(a) Check the front wiper switch.

Text in Illustration

*a

Component without harness connected

(Windshield Wiper Switch Assembly)

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

A-1 (+S) - A-3 (+1)

OFF

Below 1 Ω

A-1 (+S) - A-3 (+1)

INT

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

MIST

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

LO

A-2 (+B) - A-4 (+2)

HI

If the result is not as specified, replace the windshield wiper switch assembly.

(b) Check the front washer switch.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

B-2 (EW) - B-3 (WF)

ON

Below 1 Ω

OFF

10 kΩ or higher

If the result is not as specified, replace the windshield wiper switch assembly.

(c) Check the intermittent operation.

(1) Connect the voltmeter positive (+) lead to terminal A-3 (+1) and the negative (-) lead to terminal B-2 (EW).

(2) Connect the battery positive (+) lead to terminal A-2 (+B) and the negative (-) lead to terminal B-2 (EW) and A-1 (+S).

(3) Turn the wiper switch to the INT position.

(4) Connect the battery positive (+) lead to terminal A-1 (+S) for 5 seconds.

(5) Connect the battery negative (-) lead to terminal A-1 (+S). Operate the intermittent wiper relay and check the voltage between terminals A-3 (+1) and B-2 (EW).

OK:

Refer to the illustration below.

Text in Illustration

*a

Voltage between terminals A-3 (+1) and B-2 (EW)

*b

FAST: Connect battery negative lead to terminal A-1 (+S)

*c

SLOW: Connect battery negative lead to terminal A-1 (+S)

-

-

If the result is not as specified, replace the windshield wiper switch assembly.

(d) Check the front washer operation.

(1) Turn the wiper switch OFF.

(2) Connect the positive (+) battery lead to terminal A-2 (+B) and the negative (-) battery lead to terminals A-1 (+S) and B-2 (EW).

(3) Connect the positive (+) voltmeter terminal to terminal A-3 (+1) and the negative (-) voltmeter terminal to terminal B-2 (EW). Turn the washer switch on and off, and check the voltage between terminals A-3 (+1) and B-2 (EW).

OK:

Refer to the illustration below.

Text in Illustration

*1

Washer Switch

-

-

*a

Voltage between terminals A-3 (+1) and B-2 (EW)

-

-

If the result is not as specified, replace the windshield wiper switch assembly.

(e) Check the rear wiper switch.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

B-2 (EW) - B-6 (C1R)

OFF

10 kΩ or higher

B-2 (EW) - B-7 (+1R)

B-2 (EW) - B-6 (C1R)

LO

Below 1 Ω

B-2 (EW) - B-7 (+1R)

HI

If the result is not as specified, replace the windshield wiper switch assembly.

(f) Check the rear washer switch.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

A-5 (WR) - B-2 (EW)

OFF

10 kΩ or higher

B-2 (EW) - B-7 (+1R)

A-5 (WR) - B-2 (EW)

WASH

Below 1 Ω

A-5 (WR) - B-2 (EW)

ON + WASH

B-2 (EW) - B-7 (+1R)

If the result is not as specified, replace the windshield wiper switch assembly.