Classification:

Reference:

Date:

BT20-005a

ITB20-006a

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 Infiniti 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.

Infiniti 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 Infiniti retailer to determine if this applies to your
vehicle.

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DIAGNOSIS PROCEDURE
1.
2.
3.
4.

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.
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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ITB20-006a

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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ITB20-006a

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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ITB20-006a

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

ITB20-006

Original bulletin published

December 17, 2020

ITB20-006a

APPLIED VEHICLES revised

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ITB20-006a