Classification:

Reference:

DA22-001B

Date:

NTB22-038B

June 20, 2023

RAB WARNING LIGHT ON IN INSTRUMENT PANEL
AND/OR DTC B2724-23 STORED
This bulletin has been amended. See AMENDMENT HISTORY on the last page.
Please discard previous versions of this bulletin.

APPLIED VEHICLES:

2019-2021 Altima (L34)
2019-2022 Murano (Z52)
2019-2021 Rogue Sport (J11)
2019-2021 Versa (N18)

APPLIED SYSTEMS:

Rear Automatic Braking (RAB)

IF YOU CONFIRM
The customer states the RAB warning light
information display,

is ON in the instrument panel’s

AND/OR
DTC B2724-23 (SONAR CONTROL UNIT - SONAR ECU INTERNAL FAILURE [UNDER
VOLTAGE]) is stored.

ACTION
Reprogram and configure the Sonar Control Unit using the SERVICE PROCEDURE in this
bulletin, if applicable.

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.
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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SERVICE PROCEDURE
Sonar Control Unit Reprogramming
IMPORTANT: Before starting, make sure:


All CONSULT-III plus (C-III plus) software updates (if any) have been installed.



The CONSULT PC is connected to the internet via a cable or Wi-Fi.
o Later in the procedure you will be required to enter your username and
password.
o If you do not know your username and password, contact your service
manager.



A screen print for warranty documentation can be done from the CONSULT PC
during this service procedure while still connected to the vehicle.



No diagnostic trouble codes (DTCs) are stored.
o Use C-III plus to perform Self Diagnosis for all systems.
o If there are any DTCs, other than B2724-23 and C1B56-04, diagnose, perform
repairs, and erase DTC before continuing.

1.

Connect the Vehicle Interface (VI) to the vehicle.
 Make sure to use the correct VI for the CONSULT.
Make sure the VI is securely connected. If the VI connection is loose during
reprogramming, the process will be interrupted and the control unit may be damaged.

2.

Connect the AC Adapter to the CONSULT PC.
Be sure to connect the AC Adapter. If the CONSULT PC battery voltage drops during
reprogramming, the process will be interrupted and the control unit may be damaged.

3.

Connect a battery maintainer or smart charger set to reflash mode or a similar setting.
To avoid damage to the control unit, ensure a battery maintainer or smart charger is
connected. The battery voltage must be between 12.0V and 15.5V during
reprogramming.

4.

Turn OFF all external Bluetooth® devices (e.g., cell phones, printers, etc.) within range
of the CONSULT PC and the VI.
Make sure to turn OFF all external Bluetooth® devices. If Bluetooth® signal waves are
within range of the CONSULT PC and the VI during reprogramming, reprogramming
may be interrupted and the control unit may be damaged.

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NTB22-038B

5.

Turn the ignition ON with the engine OFF.
To avoid damage to the control unit, the engine must not start or run during the
reprogramming procedure.

6.

Turn OFF all vehicle electrical loads such as exterior lights, interior lights, HVAC,
blower, rear defogger, audio, NAVI, seat heater, steering wheel heater, etc.

7.

Turn ON the hazard warning lamps.

8.

Turn ON the CONSULT PC.

9.

Start C-III plus.

10.

If prompted, select USA/CANADA Dealers from the drop down menu, and then
select OK.

11.

Login using your NNAnet credentials.
IMPORTANT: If not prompted to enter your username and password, the CONSULT
PC may not be connected to Wi-Fi. Close C-III plus, confirm the CONSULT PC is
connected to Wi-Fi, and then reopen C-III plus.

12.

Wait for the VI to be recognized.
 The serial number will display when the VI is recognized.

VI is
recognized

Figure 1

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NTB22-038B

13.

Select Diagnosis (One System).

Figure 2

14.

Select SONAR.

Figure 3

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NTB22-038B

15.

Select ECU Identification.

16.

Confirm the current SOFTWARE # (Figure 4). See Table A (below) for model specific
SOFTWARE #.


If the SOFTWARE # is in Table A, this bulletin does not apply. See the Electronic
Service Manual (ESM) for further diagnostic information.



If the SOFTWARE # is not in Table A, proceed to step 17.

28538XXXXX
XXXX

Bulletin does not apply if
this number is in Table A

Figure 4

Table A
MODEL

SOFTWARE #

Altima

L139

Murano

M016, M206, or M210

Rogue Sport

S140

Versa

D137

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NTB22-038B

17.

Select Home.

28538XXXXX
XXXX

Figure 5

18.

Select Re/programming, Configuration.

Figure 6

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NTB22-038B

19.

Use the arrows (if needed) to view and read all precautions.

20.

Check the box confirming the precautions have been read.

21.

Select Next.

Figure 7

22.

Select Automatic Selection(VIN).

Example

Figure 8

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NTB22-038B

23.

Confirm the VIN or Chassis # matches the vehicle’s VIN.

24.

Select Confirm.

XXXXXXXXXXXXXXXXX
XXXXXXXX
XXXXXXXX

Figure 9

25.

Select Confirm.

XXXXXXXXXXXXXXXXX

Figure 10

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NTB22-038B

26.

Select SONAR.

Figure 11

27.

Select Reprogramming.

Figure 12

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NTB22-038B

28.

When you get to the screen shown in Figure 13, confirm that a reprogram is available
as follows.
a. Find the Sonar Control Unit Part Number and write it on the repair order.
HINT: This is the current part number (P/N).

XXXXXXXXXXXXXX

Current Sonar
Control Unit P/N

28538XXXXX
XXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXX

Figure 13

b. Compare the part number you wrote down to the part numbers in Table B.
o If there is a match, continue with the reprogramming procedure.
o If there is not a match in Table B, this bulletin does not apply. See the ESM for
further diagnostic information.
Table B
MODEL

CURRENT SONAR CONTROL UNIT PART NUMBER: 28538-

Altima

6CA2A, 6CA3A

Murano

9UH1A, 9UF1B

Rogue Sport

6MM0B

Versa

5EA0A, 5EA1A

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NTB22-038B

29.

Follow the on-screen instructions to navigate CONSULT and reprogram the SONAR.

30.

Select Save.

XXXXXXXXXXXXXX

28538XXXXX
XXXXXXXXXXXXXX
XXXXXXXXXXXXXX
XXXXXXXXXXXXXX

Figure 14

31.

Read the precautions on the CONSULT screen, check the box for Confirmed
Instructions, and then select Next. (Screens not shown.)

32.

Select Next.

28538-XXXXX
28538-XXXXX
XXXXXXXXXXXXXX
XXXXXXXXXXXXXX

Figure 15
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NTB22-038B

HINT: If you get the screen below and it is blank (no reprogramming listed), it means
there is no reprogramming available for this vehicle. Close CONSULT and refer back
to the ESM for further diagnosis.

SONAR

Figure 16

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NTB22-038B

33.

Make sure OK is highlighted green (battery voltage must be between 12.0 and 15.5
Volts).
To avoid damage to the control unit, ensure a battery maintainer or smart charger is
connected. The battery voltage must be between 12.0V and 15.5V during
reprogramming.

34.

Select Next.

Monitor battery
voltage here

Figure 17
35.

Confirm all Judgment items are “OK”, and then select Start.

Monitor battery
voltage here

Figure 18
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NTB22-038B

36.

Wait for both progress bars to complete.

Figure 19


When the screen in Figure 20 displays, the reprogramming is complete.



If the screen in Figure 20 does not display (indicating that reprogramming did not
complete), refer to Sonar Control Unit Recovery on the next page.