Classification:

AN21-017

Reference:

Date:

NTB21-067

July 29, 2021

HIGH FREQUENCY NOISE WITH AUDIO SYSTEM DISPLAY ON
APPLIED VEHICLES:
APPLIED DATE:
APPLIED TRIM LEVEL:

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,
NOTE:
 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 Audio Control Unit software version to 423.

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 entire SERVICE PROCEDURE 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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REQUIRED SPECIAL TOOL


One special tool, USB drive J-52727-1, has been shipped to each dealer (see Figure 1).



Do not use any other USB drive to perform the procedure in this bulletin.



Additional USB drives may be purchased from Tech•Mate: nissantechmate.com or
1-800-662-2001.

HINT: The update-software must be the only file on the drive.

Figure 1

Do not apply this software update to models outside of the APPLIED DATE range. If
applied outside of the APPLIED DATE range, the Audio Control Unit may be
damaged.


Damaged Audio Control Units, due to improperly following the SERVICE
PROCEDURE in this bulletin or the software update being applied outside of the
APPLIED DATE range, will not be eligible for warranty claims.

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NTB21-067

SERVICE PROCEDURE
Check Software Version

1.

Select Settings, located in the lower
right hand corner of the AV unit
display shown in Figure 2.

Figure 2

2.

Select Info.

Figure 3

3.

Select System Information.

Figure 4

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NTB21-067

4.

Select Version Information.

Figure 5

5.

Verify the Software Version is 321 or
420.


If the software version is 321 or
420, proceed to step 6 on page 5.



If the software version is not 321 or
420, the service procedure is
complete. Proceed to CLAIMS
INFORMATION on the last page of
this bulletin.
NOTE: Further diagnostic may be
needed that is not covered by this
bulletin. Refer to the appropriate
section of the Electronic Service
Manual (ESM).

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Figure 6

NTB21-067

Download Software from Infotainment Downloader Tool

IMPORTANT: Before starting, make sure:

6.



The CONSULT PC is connected to the internet.



ASIST has been synchronized (updated) to the current date.

Insert special tool USB drive J-52727-1 into the CONSULT PC.


If the infotainment update-software has already been downloaded onto special
tool USB drive J-52727-1 from a prior service procedure, skip to step 15 on page
8.
HINT:
 Special tool USB drive J-52727-1 is the only USB drive approved for use
with this procedure.
 The update-software must be the only file on the USB drive.
 The update-software is estimated to take 10-15 minutes to download to
the USB drive.
 The update-software only needs to be downloaded once and can then be
used continuously on multiple Applied Vehicles.

7.

Open ASIST.

8.

Select Specialty Tools, and then select Infotainment Software Updates.

Specialty Tools
Infotainment Software Updates

Figure 7
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NTB21-067

9.

Select the check box next to infotainment update-software IVI0423 (Figure 8).

10.

Use the drop-down menu and select the location of the USB drive that was inserted in
step 6.

Version:

Check
box
D:\

USB drive
location

IVI0423

Infotainment
update-software

Drop-down
menu

Figure 8

11.

Select Download, and then wait for the download to complete.
HINT: The update-software is estimated to take 10-15 minutes to download to the
USB drive.

12.

Select OK when the message in Figure 9 is displayed.

Figure 9

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NTB21-067

13.

Once the transfer is complete, safely remove the USB drive from the CONSULT PC.
a.

From the PC toolbar, select the Safely Remove Hardware icon.
o The icon is on the toolbar, or can be found after selecting the arrow.

b.

Select the USB drive to be removed, and then remove the USB drive from the
CONSULT PC.
Follow the steps to safely remove the USB drive. If not followed, the USB drive
may corrupt the infotainment update-software.
o If you are not familiar with the process of safe USB drive removal, ask for
assistance at your dealer.

Safely Remove
Hardware icon

USB Drive (E:)

Arrow on toolbar

Figure 10

14.

Close all ASIST Infotainment Software Update screens.

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NTB21-067

Reprogram the Audio Control Unit
15.

Set the parking brake.

16.

Start the engine, and then wait 60 seconds for the system to load.
HINT: The engine needs to idle for the duration of the update to retain battery charge.

17.

Insert the USB drive with the
infotainment update-software into the
vehicle’s USB media port (Figure 11).


Do not remove the USB drive
during the update to the vehicle
until instructed to.

USB Media port

Figure 11

18.

Wait approximately 10-30 seconds for
the screen in Figure 12 to appear, and
then select OK.

283C3C321C
283C3C423C

Figure 12


If the screen in Figure 13 is shown,
select No.

Figure 13

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NTB21-067

19.

Review the software update
requirements, shown in Figure 14, and
then select Accept to start the
reprogramming.

Figure 14

20.

When the message shown in Figure
15 is displayed, remove the USB drive
from the USB media port.
Do not remove the USB drive until
the screen in Figure 15 is displayed.
If removed prior to this screen being
displayed, the Audio Control Unit
may be damaged.

21.

Turn the ignition OFF.
Figure 15

22.

Open and close the driver door.

23.

Restart the engine.

24.

Allow the system to boot up
completely (approximately 30
seconds).


The Nissan logo will be displayed
during the reboot (Figure 16).

Figure 16

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NTB21-067

Confirm Software Version

25.

Select Settings, located in the lower
right hand corner of the AV unit
display shown in Figure 17.

Figure 17

26.

Select Info.

Figure 18

27.

Select System Information.

Figure 19

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NTB21-067

28.

Select Version Information.

Figure 20

29.

Verify the Software Version is
now 423.


If the software version is NOT 423,
start this procedure over and verify
that the correct software shown in
step 9 on page 6 is downloaded.



If the software version is 423, the
reprogramming is complete.

423

Figure 21

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NTB21-067

CLAIMS INFORMATION
Submit a Primary Operation (PO) type line claim using the following claims coding:
DESCRIPTION

OP CODE

Perform Software Check

RX9ZAA

SYM

DIA

FRT

ZE

32

0.2

OR
Submit a Primary Operation (PO) type line claim using the following claims coding:
DESCRIPTION

OP CODE

SYM

DIA

FRT

Perform Software Check & Update

RX4SAA

ZE

32

0.3

AMENDMENT HISTORY
PUBLISHED DATE REFERENCE
July 29, 2021

NTB21-067

DESCRIPTION
Original bulletin published

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NTB21-067