NHTSA ID Number: 11019934
Manufacturer Communication Number: 15-236-18R
TSB/Document Date: 2025-07-01
Summary
The following information addresses reprogramming file availability and a software update installation procedure to provide optimization to the new Harman Gen 3.1 Audio and Navigation head units utilized in the models as listed
ATTENTION:
GENERAL MANAGER
q
PARTS MANAGER
q
CLAIMS PERSONNEL
q
IMPORTANT - All
Service Personnel
Should Read and
Initial in the boxes
provided, right.
SERVICE MANAGER
q
© 2018 Subaru
of America, Inc. All rights reserved.
SERVICE BULLETIN
APPLICABILITY: 2019-23MY Impreza
2019-23MY Crosstrek (Including Hybrid Model)
2019-24MY Forester
2025MY Forester Wilderness
2019MY Legacy/ Outback
2019-21MY WRX
2019-21MY WRX STI
2019-21MY BRZ- Navigation -equipped ONLY
2019-22MY Ascent
SUBJECT:
NUMBER: 15-236-18R
DATE: 12/04/18
REVISED: 06/10/25
Reprogramming File Availability for Optimization of Harman Gen 3.1
and Gen 3.1α Audio and Navigation Head Units
INTRODUCTION:
The following information addresses reprogramming file availability and a software update
installation procedure to provide optimization to the new Harman Gen 3.1 Audio and Navigation
head units utilized in the models as listed above. The procedure will involve either downloading
the software update files from Subarunet (or using those sent directly from Nuspire) and transferring
them onto a flash drive for head unit installation. These files do NOT include Map Update data. It is
VERY IMPORTANT to read and understand this information completely to understand all changes
from prior releases before proceeding.
A time line chart along with a complete list of all the conditions addressed by this and previous
Harman 3.1 and Gen 3.1α software updates is provided in “Appendix A” located at the end of this
bulletin.
IMPORTANT NOTES:
•
This software update will improve system performance to automatically restore sound if the
issue of no audio from the AM/FM radio is encountered.
Caution: If the system detects that there is no sound from the AM/FM radio after turning the
ignition on, the audio starts playing automatically after approximately 28 seconds
•
This software update will enhance system performance to prevent delays in AM/FM radio
sound. For more details please see section “Conditions Addressed By Update #11” on page 12.
•
If a vehicle presents with a current blank or black screen condition, request an exchange unit.
CAUTION: VEHICLE SERVICING PERFORMED BY UNTRAINED PERSONS COULD
RESULT IN SERIOUS INJURY TO THOSE PERSONS OR TO OTHERS.
Subaru Service Bulletins are intended for use by professional technicians ONLY. They
are written to inform those technicians of conditions that may occur in some vehicles,
or to provide information that could assist in the proper servicing of the vehicle. Properly
trained technicians have the equipment, tools, safety instructions, and know-how to
do the job correctly and safely. If a condition is described, DO NOT assume that this
Service Bulletin applies to your vehicle, or that your vehicle will have that condition.
Subaru of America, Inc. is
ISO 14001 Compliant
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Management Systems. Please recycle
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Continued...
Bulletin Number: 15-236-18R; Revised: 06/10/25
Page 1 of 26
•
Be sure to locate and re-format any existing USB drives used for updating Harman audio units
in order to fully clear them before adding these new files to them.
•
On BRZ models, this update applicable to HIGH / Navigation-equipped head units only.
•
If a Map update is pending, please follow the instructions posted on Subarunet: Service
Operations & Technical > Forms/Downloads > Navigation System Map Updates and select
the applicable link.
PART INFORMATION:
Multimedia System Type
Descriptive Features
6.5 Inch Display Audio System (Base)
No CD slot / Eject Button
6.5 Inch Display Audio System (Base +)
Equipped with CD Player and Eject Button
Attention: 24MY Forester will not have CD Player and Eject
Button. Please see TSB 15-313-23 to verify trim using
corresponding Model Option code.
8.0 Inch Display Audio System (Mid)
Phone Button
8.0 Inch Audio / Navigation System (High)
Map Button but no Phone Button
Reference photos of each head unit faceplate are supplied below:
BASE +
Uses MID
update file
Attention: 24MY Forester will not have CD Player and Eject Button. Please see TSB 15-313-23 to
verify BASE+ trim and part number using corresponding Model Option code
Continued...
Bulletin Number: 15-236-18R; Revised: 06/10/25
Page 2 of 26
Materials Required:
An empty, USB 2.0 or 3.0 storage device (flash drive) will be needed to perform the update
procedure. The device should be dedicated to storing and transferring these updating files only. It
must be a minimum of 16GB or more in size and contain a NTFS file format before downloading the
update files onto it.
IMPORTANT NOTES:
•
NEVER change the update file names after downloading them.
•
NEVER save any other files on the same flash drive.
There are various types of USB flash drive available from many suppliers. If the head unit does NOT
recognize the USB drive during the reprogramming process, due to controller IC type of USB drive
or compatibility with the head unit, clear the file and re-format the flash drive for “FAT32” as outlined
below in Step 2 instead of “NTFS”. If a recognition problem persists, use USB flash drive from
another manufacturer.
Recommended Flash Drives:
•
Kingston®: Data Traveler G3, G4, SE9 or the Hyper-X Series
•
SanDisk®: Cruzer Series, Ultra Flair
•
Transcend®: JetFlash 300, 600 or 790
•
Verbatim®: Store ‘n’ Go
Continued...
Bulletin Number: 15-236-18R; Revised: 06/10/25
Page 3 of 26
SERVICE PROCEDURE / INFORMATION:
REMINDER: Customer satisfaction and retention starts with performing quality repairs.
Step 1- Software Version Confirmation From the HOME screen, touch “Settings”.
After starting the engine, from the HOME screen, touch “Settings”.
•
From the Settings screen, scroll down to and then touch “System Information”.
•
The currently installed software version will be displayed. If the Software Version is
NOT Rel_UK.25.04.70 (Rel_UK.YY.WW.70) or later, proceed to Step 2 otherwise no
further action is required.
Note: In the software version “YY” stands for year, “WW” stands for week. For example,
Rel_UK.25.04.70 means software prepared in year 2025 week 04.
Attention: This update doesn’t apply to BASE trim. For BASE the latest installed version is
Rel_UL.23.42.70.
Continued...
Bulletin Number: 15-236-18R; Revised: 06/10/25
Page 4 of 26
STEP 2- Prepare the USB:
CAUTION: Do not use any USB flash drive which utilizes file organizing software or an operating
system.
VERY IMPORTANT: Before attempting to download any data files, confirm the PC and flash drive
being used is not infected with any virus. The flash drive MUST be formatted for NTFS .
•
Make sure the USB flash drive contains no other
files.
•
Right click on the corresponding “Removable
Disk”.
•
Select “Format”.
•
From the File System drop-down menu, select
“NTFS”
•
Check the “Quick Format” box (if not already
done).
•
Click on “Start” to format the USB flash drive.
STEP 3- Download the Update Files to the USB:
VERY IMPORTANT: When updating a “Base +” head unit, the “MID” update files must be used.
The files are available for download on Subarunet (see “A” below).
The applicable reprogramming files have also been sent directly to retailers by Nuspire in the same
way a Select Monitor Update would be pushed out. (see “B” below).
Follow “A” when using files downloaded from Subarunet.
Follow “B” when using the files sent directly to the SDS notebook from Nuspire.
“A” When using update files downloaded from Subarunet:
Click Here to Access the Downloads for Audio/Navigation Information on Subarunet
Continued...
Bulletin Number: 15-236-18R; Revised: 06/10/25
Page 5 of 26
IMPORTANT: Files downloaded from Subarunet will be .zip files and must be unzipped before
they can be used. Using the normal audio / navigation system file update download procedure: Go
to Subarunet, select Service Operations and Technical>>Forms/Downloads>>Gen 3/Harman for
Audio/Navi then click on the applicable Hyperlink to download the file(s) to the SDS Notebook or
PC:
BASE-2019- Impreza-23 Crosstrek-23 Crosstrek--Hybrid-23 Legacy-Outback-19 Forester-24
Ascent-22 WRX-21 BRZ-20 HARMAN AUDIO UPDATE- DECEMBER 2023
BASE PLUS or MID-2019 - Impreza-23 Crosstrek-23 Crosstrek--Hybrid-23 Legacy-Outback-19
Forester-24 Ascent-22 WRX-21 BRZ-20 HARMAN AUDIO UPDATE- JUNE 2025
HIGH-2019- Impreza-23 Crosstrek-23 Crosstrek--Hybrid-23 Legacy-Outback-19 Forester-24
Ascent-22 WRX-21 BRZ-20 HARMAN AUDIO UPDATE- JUNE 2025
•
Go to Downloads.
•
CAUTION: After download is complete, NEVER change the file or folder names.
•
Once the files have been downloaded from Subarunet, click on the Downloads folder and then
sort by Date Modified to bring the most recent files to the top of the list.
•
Open / display the contents of File folder, for example (HIGH - 2019-20 Impreza_Crosstrek_
Crosstrek Hybrid_BRZ_Forester_Ascent_WRX & 2019 Legacy-Outback HARMAN AUDIO
UPDATE - DECEMBER 2019).
•
Click on “Extract All Files”.
•
From the dialog box, browse to My Documents then click on “Extract”.
•
Double-click on the required file (for this example, select the file entitled “HIGH - 2019-20
Impreza_Crosstrek_Crosstrek Hybrid_BRZ_Forester_Ascent_WRX & 2019 Legacy-Outback
HARMAN AUDIO UPDATE - DECEMBER 2019”).
•
Copy ONLY the “update” folder then paste (or click / drag) it to the “clean” USB flash drive
as listed (Removable Disk) in the directory.
•
To avoid confusion, label each flash drive with the file contents (e.g. BASE 3.1, BASE PLUS
or MID 3.1 or HIGH 3.1).
•
Go to Step 4.
“B” When using update files sent directly from Nuspire:
•
Go to My Documents on the GUI screen to display the list of available update files shown
below.
•
CAUTION: After download is complete, NEVER change the file or folder names.
•
Sort by Date Modified to bring the most recent files to the top of the list. The folder is named:
_Harman Audio-Navi Update Files.
Continued...
Bulletin Number: 15-236-18R; Revised: 06/10/25
Page 6 of 26
•
Double-click on the required file (for this example, select the file entitled “HIGH - 2019-20
Impreza_Crosstrek_Crosstrek Hybrid_BRZ_Forester_Ascent_WRX & 2019 Legacy-Outback
HARMAN AUDIO UPDATE - DECEMBER 2019”) and the update file will display as
shown.
•
Select the update folder and either copy / paste or click / drag it to the USB flash drive.
NOTE: Do not copy the entire “HIGH-20…” File folder. Copy ONLY the File folder named
“update” to the flash drive
•
Once the folder named “update” is loaded onto the USB flash drive, right click on the drive
and select “Eject”.
•
Remove the USB flash drive after the prompt appears that says “Safe to Remove Hardware”.
•
Mark the USB to indicate the head unit it will update (HIGH 3.1 in this example).
•
Repeat the above steps to create the BASE PLUS or MID 3.1 and HIGH 3.1 USB flash drives
as needed using a separate USB drive for each update folder.
STEP 4- IMPORTANT: Confirm the update folder on the USB flash drive is for the head unit being
reprogrammed ONLY. NEVER install multiple update folders onto the same flash drive at the same
time.
IMPORTANT REMINDER: When updating a “Base +” head unit, the “BASE PLUS or MID 3.1”
update files must be used.
• After confirmation, move to the car and either start the engine or follow the procedure as
outlined in document GR8-1100 on STIS for use of the GR8’s Power Supply Mode.
HIGH - 2019-20 Impreza_Crosstrek_Crosstrek Hybrid_BRZ_Forester_Ascent_WRX & 2019 Leg...
Copy ONLY the folder named “update” to the USB.
•
Never change the folder name from “update”.
•
Confirm there is only a folder named “update” on the flash drive.
Continued...
Bulletin Number: 15-236-18R; Revised: 06/10/25
Page 7 of 26
CAUTION: Confirm one final time the head unit you are about to update matches the update file
selected. Attempting to install the incorrect update file will disable the head unit.
STEP 5- Update Installation:
IMPORTANT: Always record the customer’s radio station presets and navigation favorites (where
applicable) before proceeding further as they will most likely need to be reset once the update and
re-boot procedures are completed. In addition, some customizable system settings may need to be
reset as they may return to the default setting during the update.
•
With the engine idling (or GR8 connected), plug the flash drive into the USB Port.
IMPORTANT NOTE: If the head unit does not recognize the USB flash drive during the
reprogramming process, this may be due to an incompatible Controller IC in the USB flash drive or
it is otherwise incompatible with the head unit. If this occurs, delete all files from the flash drive and
re-format it to “FAT32”, instead of “NTFS” and reload the appropriate “update” folder to the USB
flash drive. If the USB flash drive is still not recognized, please discontinue the use of that drive and
instead use a USB flash drive from a different manufacturer.
•
After the unit “authenticates” the USB flash drive, press “Next” and after the second screen is
displayed, press “Next” again.
NOTE: If an attempt is made to install the wrong “grade” file into the wrong grade head unit
(EXAMPLE: “Base” update file into a “Base Plus or Mid” or “High” head unit), the USB
Authentication error screen below will be displayed:
Continued...
Bulletin Number: 15-236-18R; Revised: 06/10/25
Page 8 of 26
•
HIGH and MID only trim head unit
The current and available software version information will be displayed. The Available
Version I.D should be REL_UK.25.04.70.
Rel_UK.25.04.70
•
After confirming the Available Version, press “Install Now” to start the reprogramming
process. The screen will go blank (black) for a brief period after installation begins.
•
Each of the updates (Base, Mid and High) should take less than 10 minutes to install.
IMPORTANT NOTES:
•
Do not leave the vehicle once the update begins as ignoring pop-up requests may lead to
battery discharge.
•
Do not touch any of the buttons on the head unit while the updating process is taking place.
•
If during the updating an error screen is displayed asking “Do you want to Retry”, press
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TSB/Document ID: 15-236-18R
Replacement Service Bulletin Number:
MFR Communication Date: 2025-06-10
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
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