Toyota 4Runner: Inspection

Toyota 4Runner Service Manual / Vehicle Exterior / Wiper / Washer / Wiper Switch / Inspection

INSPECTION

PROCEDURE

1. INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY

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

Standard Resistance:

Front Wiper Switch

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

Front Washer Switch

Tester Connection	Switch Condition	Specified Condition
B-2 (EW) - B-3 (WF)	On	Below 1 Ω
B-2 (EW) - B-3 (WF)	Off	10 kΩ or higher

Rear Wiper Switch

Tester Connection	Switch Condition	Specified Condition
B-6 (C1R) - B-2 (EW)	Off	10 kΩ or higher
B-7 (+1R) - B-2 (EW)	Off	10 kΩ or higher
B-6 (C1R) - B-2 (EW)	INT	Below 1 Ω
B-7 (+1R) - B-2 (EW)	HI	Below 1 Ω

Rear Washer Switch

Tester Connection	Switch Condition	Specified Condition
A-5 (WR) - B-2 (EW)	Off	10 kΩ or higher
B-7 (+1R) - B-2 (EW)	Off	10 kΩ or higher
A-5 (WR) - B-2 (EW)	WASH	Below 1 Ω
A-5 (WR) - B-2 (EW)	On + WASH	Below 1 Ω
B-7 (+1R) - B-2 (EW)	On + WASH	Below 1 Ω

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

Text in Illustration

*a	Component without harness connected (Windshield Wiper Switch Assembly)

(b) Check the intermittent operation.

Connect the positive (+) lead of a voltmeter to terminal A-3 (+1) and the negative (-) lead to terminal B-2 (EW).
Connect the positive (+) lead of the battery to terminal A-2 (+B) and the negative (-) lead to terminal B-2 (EW) and A-1 (+S).
Turn the wiper switch to the INT position.
Connect the positive (+) lead of the battery to terminal A-1 (+S) for 5 seconds.

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

OK:

Voltage changes as shown in the illustration.

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

Text in Illustration

*1	Voltage between terminals A-3 (+1) and B-2 (EW)	*2	FAST: Negative lead of battery connected to terminal A-1 (+S)
*3	SLOW: Negative lead of battery connected to terminal A-1 (+S)	-	-

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