Classification:

Reference:

AN21-015B

Date:

NTB21-066B

August 24, 2022

VOLUNTARY SERVICE CAMPAIGN
2021 SENTRA; AUDIO CONTROL UNIT REPROGRAM
This bulletin has been amended. See AMENDMENT HISTORY on the last page.
Please discard previous versions of this bulletin.

CAMPAIGN ID #:
APPLIED VEHICLES:

PM991
2021 Sentra (B18) – SV and SR only

Check Service COMM or Dealer Business Systems (DBS)
National Service History to confirm campaign eligibility.

INTRODUCTION
Nissan is conducting this voluntary service campaign, on certain specific model year 2021
Sentra SV and SR vehicles, to reprogram the Audio Control Unit. This service will be
performed at no charge to the customer for parts or labor.

IDENTIFICATION NUMBER
Nissan has assigned identification number PM991 to this campaign. This number must
appear on all communication and documentation of any nature dealing with this campaign.

DEALER RESPONSIBILITY
Dealers are to repair vehicles falling within range of this campaign that enter the service
department. This includes vehicles purchased from private parties, vehicles presented by
transient (tourists) owners, and vehicles in a dealer’s inventory.

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.

1/12

REQUIRED SPECIAL TOOL


One of special tool USB drive J-52727 (new tool number NI-52727-1) has been
previously shipped to each dealer (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:
www.techmatetools.com or 1-833-397-3493.
HINT:
o The update-software only needs to be downloaded once and can then be
used continuously on multiple APPLIED VEHICLES.
o The update-software must be the only file on the USB drive.

Figure 1

2/12

NTB21-066B

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
3/12

NTB21-066B

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.
NOTE: Further diagnostic may be
needed that is not covered by this
bulletin. Refer to the appropriate
section of the Electronic Service
Manual (ESM).

4/12

Figure 6

NTB21-066B

Download Software from the 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 the special tool USB drive into the CONSULT PC.


If the update-software has already been downloaded onto the USB drive from a
prior SERVICE PROCEDURE, skip to step 15 on page 7.
HINT:
o The special tool USB drive is the only USB drive approved for use with this
procedure.
o The update-software must be the only file on the USB drive.
o The update-software is estimated to take 10-15 minutes to download to the
USB drive.
o 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

5/12

NTB21-066B

9.

Select the check box next to infotainment update-software PM991_SENTRA
(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

PM991_SENTRA

Drop-down
menu

Infotainment
update-software

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

6/12

NTB21-066B

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.

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.

7/12

NTB21-066B

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.

Figure 12



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

Figure 13

8/12

NTB21-066B

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
Figure 15 is displayed. If removed
prior to this screen being displayed,
the Audio Control Unit may be
damaged.

21.

Turn the ignition OFF.

22.

Open and close the driver door.

23.

Restart the engine.

24.

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

Figure 15

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

Figure 16

9/12

NTB21-066B

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

10/12

NTB21-066B

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.

423

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

Figure 21

11/12

NTB21-066B

CLAIMS INFORMATION
Submit a “CM” line claim using the following claims coding:
CAMPAIGN (“CM”)
ID
PM991

DESCRIPTION

OP CODE

FRT

Reprogram Audio Control Unit

PM9910

0.3

AMENDMENT HISTORY
PUBLISHED DATE REFERENCE

DESCRIPTION

July 26, 2021

NTB21-066

Original bulletin published

August 9, 2021

NTB21-066A

Changes made to page 2 and page 5

August 24, 2022

NTB21-066B

Removed battery inspection and replacement.
Updated USB drive information.

12/12

NTB21-066B