Classification:

Reference:

BT20-004a

Date:

NTB20-010a

December 17, 2020

WINDSHIELD WIPER BLADE PERFORMANCE/DIAGNOSIS
SERVICE INFORMATION
This bulletin has been amended. See AMENDMENT HISTORY on the last page.
Please discard previous versions of this bulletin.

APPLIED VEHICLES: All 2019-2021 Nissan vehicles

SERVICE INFORMATION
Dirt, dust, debris, ice, snow, and bugs can reduce the cleaning performance of a vehicle’s
windshield wiper blades, even with new wiper blades. Worn wiper blades can damage the
windshield and impair driver vision. To determine if the wiper blades need replacement,
follow the DIAGNOSIS PROCEDURE on the next page.

Nissan Bulletins are intended for use by qualified technicians, not 'do-it-yourselfers'. Qualified technicians are
properly trained individuals who have the equipment, tools, safety instruction, and know-how to do a job properly
and safely. NOTE: If you believe that a described condition may apply to a particular vehicle, DO NOT assume
that it does. See your Nissan dealer to determine if this applies to your vehicle.

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DIAGNOSIS PROCEDURE
1.
2.

Clean the outside of the windshield with a washer solution or a mild detergent.
Clean each wiper blade by wiping it with a cloth soaked in a washer solution or a mild
detergent.
Rinse each wiper blade with clear water.
Spray the windshield with washer fluid using the washer switch while operating the
windshield wipers.

3.
4.

To avoid damage to the windshield or windshield wiper blades, do not operate the
windshield wipers while the windshield is dry. Spray water onto the windshield using a
garden hose or use the washer switch to spray the windshield washer fluid.
5.

Grade the windshield wiper blade performance using the Wiper Blade Performance
Chart below. Refer to Figure 2 through Figure 6 for examples of actual incidents.


If the wiper performance is graded at 4 or less, replace the windshield wiper blades.



If the wiper performance is graded at 4.5 or higher, the windshield wiper blades do
not need to be replaced.

Wiper Blade Performance Chart

5

4.5-5

4

3.5-4

3-3.5

2-3

1-2

1

Replace

Replace

Don’t replace

5

Figure 1
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NTB20-010a

Examples of Wiper Blade Performance
One streak in the driver’s field of view. The wiper blade should perform normally after
cleaning the windshield and wiper blade. Grade 4.5-5 - Do not replace the wiper blades.

4.5-5

Figure 2
Streaks along the entire windshield. Grade 3.5 - Replace the wiper blades.

3.5

Figure 3
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NTB20-010a

Examples of Wiper Blade Performance (continued)
One unwiped area/water remains. Grade 3 - Replace the wiper blades.

3

Figure 4

Two or more unwiped areas/water remains. Grade 2 - Replace the wiper blades.

2

Figure 5

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NTB20-010a

Examples of Wiper Blade Performance (continued)

Wiper blade chatter. Grade 1 - Replace the wiper blades.

1

Figure 6

AMENDMENT HISTORY
PUBLISHED DATE REFERENCE

DESCRIPTION

February 18, 2020

NTB20-010

Original bulletin published

December 17, 2020

NTB20-010a

APPLIED VEHICLES revised

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NTB20-010a