NTB21-067B

Classification:
Reference:
AN21-017B
Date:
NTB21-067B
January 29, 2024
HIGH FREQUENCY NOISE WITH AUDIO SYSTEM DISPLAY ON
This bulletin has been amended. See AMENDMENT HISTORY on the last page.
Please discard previous versions of this bulletin.
APPLIED VEHICLES:
APPLIED DATES:
APPLIED TRIM LEVELS:
2021 Sentra (B18)
Built after March 17, 2021
SR and SV
IF YOU CONFIRM
There is a high frequency (17 kHz) noise with the audio system display screen turned ON,
HINT:
 The 17kHz range may not be audible to some people.
 Noise can be heard with the audio system ON or OFF.
AND
The high frequency noise is not heard with the audio system display screen turned OFF,
AND
Service Comm does not show PM991 applies to the vehicle you are working on.
HINT: If Service Comm shows PM991 does apply to the vehicle you are working on,
perform PM991 and do not apply this bulletin.
ACTION
1.
Confirm the current Audio Control Unit software version is 321 or 420.
2.
Update the infotainment software.

Refer to the Infotainment Software Update Utility, located in ASIST under
SPECIALTY TOOLS  Infotainment Software Updates, for the latest infotainment
update-software, infotainment update procedures, and claims information.
IMPORTANT: The purpose of ACTION (above) is to give you a quick idea of the work you
will be performing. You MUST closely follow the procedure(s) provided in the Infotainment
Software Update Utility as it contains information that is essential to successfully
completing this repair.
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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AMENDMENT HISTORY
PUBLISHED DATE REFERENCE
DESCRIPTION
July 29, 2021
NTB21-067
Original bulletin published
March 23, 2023
NTB21-067A
Changes made throughout
January 29, 2024
NTB21-067B
Revised to reference the Infotainment Software
Update Utility in ASIST instead of NTB23-018
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NTB21-067B