ATTENTION:
GENERAL MANAGER

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PARTS MANAGER

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CLAIMS PERSONNEL

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IMPORTANT - All
Service Personnel
Should Read and
Initial in the boxes
provided, right.

SERVICE MANAGER

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© 2022 Subaru of America, Inc. All rights reserved.

SERVICE BULLETIN
APPLICABILITY:
23-25MY Outback/Legacy Models
(including Wilderness models)
23-25MY Ascent Models
24-26MY Impreza
24-26MY Crosstrek (including Wilderness models)
24-25MY WRX

25-26MY Forester

26MY Forester Wilderness

NUMBER: 15-305-22R
DATE:

11/15/22

REVISED:

01/20/26

SUBJECT:
Reprogramming File Availability for Optimization
of Gen 4.5 Denso CP1.5 Infotainment Systems
INTRODUCTION:

The following information announces reprogramming file availability and provides a software
update installation procedure to optimize the new Gen 4.5 Denso CP1.5 Audio and Navigation head
units utilized in the models listed above. As in previous models, the procedure will involve either
downloading the software update files from Subarunet or using those sent directly from Nuspire
to the SDS Notebook and transferring them onto a USB flash drive for head unit installation. This
update offer countermeasure for the CarPlay concern with hands-free call, when receiving party is not
able to hear the caller as the microphone data is muted. For information on the scope of this update
and past updates please see Appendix 9.
IMPORTANT NOTE: 2025 MY Legacy and 2025 MY Outback (including Wilderness) require
confirming service program WRC-24 applicability prior to proceeding with the process outlined in
this bulletin. This software update will contain countermeasure to satisfy service program WRC-24
requirement. See Appendix 9.
ATTENTION: For Impreza/Crosstrek 24-26MY and WRX 24-25MY and Legacy/Outback
25MY and Forester 25-26MY it is required to use SSM5-R to access Software Update setting in
Dealership Mode Menu.
LEGACY/OUTBACK 23-24MY
ASCENT 24-25MY

IMPREZA/CROSSTREK 24-26MY
WRX 24-25MY
LEGACY/OUTBACK 25MY
FORESTER 25-26MY

REPROGRAMMING BY USB

APPLICABLE

NOT APPLICABLE

REPROGRAMMING BY SSM5-R AND USB

NOT APPLICABLE

APPLICABLE

It is VERY IMPORTANT to read and understand this information completely before proceeding.
CAUTION: VEHICLE SERVICE PERFORMED BY UNTRAINED PERSONAL COULD RESULT
IN THE EQUIPMENT DAMAGE OR EVEN SERIOUS INJURY.
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
ISO 14001 is the international standard for
excellence in Environmental Management
Systems. Please recycle or dispose of
automotive products in a manner that is friendly
to our environment and in accordance with all
local, state and federal laws and regulations.

Continued...
Bulletin Number: 15-305-22R; Revised: 01/20/26

Page 1 of 80

After this update is successfully completed the vehicle is capable of SiriusXM with 360L service
SiriusXM (SXM) with 360L service is a combination of satellite radio and streaming services. It
uses both satellite and internet connection modem (DCM) to deliver 200+ channels, with some
channels delivered exclusively via modem (DCM).
Service Bulletin is intended for use by trained technicians ONLY. It informs technicians of
conditions, which may occur in some vehicles or provides information, which could assist with
proper servicing of the vehicle. Properly trained technicians have the equipment, tools, safety
instructions, and know-how to do the job correctly and safely.
A timeline chart along with a complete list of all the conditions addressed and enhancements included
in this and previous Denso software updates are provided in Appendix 8 and Appendix 9 located at
the end of this bulletin.
IMPORTANT NOTE: The update contains 3 folders and 2 files. When performing an update, the
USB must contain the matching number of folders and files and all files must be replaced.
ALWAYS use the latest files together as a set.
NEVER reuse or combine files from a prior update with a newer version.
PART INFORMATION:
NOTE: High Level unit is equipped with Navigation option
(Map icon on Home screen)

11.6-Inch Display, Mid and High Level Units

Dual 7.0-Inch Display, Base Level Unit

Continued...
Bulletin Number: 15-305-22R; Revised: 01/20/26

Page 2 of 80

Materials Required:
•
•
•

SDS notebook
DSTi/DST10
Flash drive USB 2.0 or higher

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 should be a
minimum of 64GB or more in size and contain a NTFS file format before downloading the update files
onto it. Be sure to locate and re-format any existing USB drives used for updating audio units. They
must be fully cleared before adding these new update files to them.
IMPORTANT NOTES:
• NEVER change the update file names after downloading them.
• NEVER save any other files on the same flash drive.
Please follow Appendix 1 "Flash Drive Selection" for selecting an applicable storage device
SERVICE PROCEDURE / INFORMATION:
REMINDER: Customer satisfaction and retention starts with performing quality repairs.
STEP 1- VERY IMPORTANT: Before proceeding with the software updating procedure, the
currently installed software version ID MUST be confirmed by following the steps below:
1a) After starting the engine and system boot-up completes, from the HOME screen, touch the
Settings button.

1b) Press the General button. Use the down arrow to scroll to System Information then press to
display the System Information / Version information.

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Bulletin Number: 15-305-22R; Revised: 01/20/26

Page 3 of 80

IMPORTANT NOTE: 2025 MY Legacy and 2025 MY Outback (including Wilderness) require
confirming service program WRC-24 applicability prior to proceeding with the process outlined in
this bulletin. This software update will contain countermeasure to satisfy service program WRC-24
requirement. See Appendix 9.
Please note the last six digits of the software version (XXX-XXX) would determine an eligibility
for the software update. If the the last six digits of the software version are not “185-180” proceed
to STEP 2 below. Otherwise the unit already has the latest software version installed. No update is
required at this time.
STEP 2- Prepare the USB flash drive
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:
Please transfer the files to USB Flash Drive following Appendix 2 "Download the Update Files to
the USB".
STEP 4- Perform the software update.
CAUTIONS:
NEVER attempt to install the software immediately following an exchange module installation. Let
the system restart first and operate for 20 minutes.
NEVER attempt to install the software a second time for 30 minutes following a previously
unsuccessful software installation.
NEVER attempt to install the software for at least 30 minutes after completing a FOTA update.

Continued...
Bulletin Number: 15-305-22R; Revised: 01/20/26

Page 4 of 80

Perform the update in a well ventilated location if updating with the engine running OR with the
ignition ON and a battery charger connected.
Impreza/Crosstrek 24-26MY
Legacy/Outback 23 – 24MY

WRX 24-25MY

Ascent 23-25MY

Legacy/Outback 25MY
Forester 25-26MY

Reprogramming by USB

Applicable

Not Applicable

Reprogramming by SSM5-R and USB

Not Applicable

Applicable

ATTENTION: For Impreza/Crosstrek 24-26MY and WRX 24-25MY and Legacy/Outback 25MY
and Forester 25-26MY it is required to use SSM5-R to access Software Update setting in Dealership
Mode Menu.
Please refer to Appendix 4 “Perform the software update by SSM5-R and USB” for the work
procedures for Impreza/Crosstrek 24-26MY and WRX 24-25MY and Legacy/Outback 25MY and
Forester 25-26MY.
For Legacy/Outback 23 - 24MY and Ascent 23-25MY please access Software Update setting in
Update setting in Dealership Mode Menu by using CP1 controls directly from CID.
Please refer to Appendix 3 “Perform the software update by USB” for the work procedures for
Legacy/Outback 23 - 24MY and Ascent 23-24MY.
WARRANTY / CLAIM INFORMATION:
For vehicles within the Basic New Car Limited Warranty period or covered by an active Subaru
Added Security Gold plan, this repair may be submitted using the following claim information:
When SSM5 IS required (IMPREZA/CROSSTREK 24-26MY, WRX 24-25MY, LEGACY/
OUTBACK 25MY, FORESTER 25-26MY)
Labor Description

Labor Operation#

Labor Time

Fail Code

DENSO CP1 SOFTWARE-REPROGRAMMING BY SSM5 AND USB INCLUDES VERSION CHECK

A831-086

1.0

ZTZ-48
(BASE, MID, HIGH)

When SSM5 is NOT required (LEGACY/OUTBACK 23-24MY, ASCENT 23-25MY)
Labor Description

Labor Operation#

Labor Time

Fail Code

VERSION CHECK & CP1 REPROGRAMMING USB - INCLUDES
VERSION CHECK

A832-286

0.6

ZTZ-48

REMINDER: The new Software Version number must be entered when prompted at claim entry.
ATTENTION: Please follow TSB WRC-24 for entering warranty/claim information, as applicable
Continued...
Bulletin Number: 15-305-22R; Revised: 01/20/26

Page 5 of 80

NOTE: Retailers are now permitted to claim up to $5.00 per claim in Sublet to help offset the cost
of replacement USB drives. Repeated re-formatting of the USB drives used for reprogramming
can compromise their ability to operate properly. Over time, hardware connections can loosen and
stored data files can become corrupted. Retailers are responsible for replacing any worn or otherwise
inoperable USB drives as needed. This compensation is intended to help defray those costs.
IMPORTANT REMINDERS:
•

SOA strongly discourages the printing and/or local storage of service information as
previously released information and electronic publications may be updated at any time.

•

Always check for any open recalls or campaigns anytime a vehicle is in for servicing.

•

Always refer to STIS for the latest service information before performing any repairs.

Continued...
Bulletin Number: 15-305-22R; Revised: 01/20/26

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Appendix 1
Flash Drive Selection
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, confirm the flash drive format is NTFS. The flash drive
must be formatted for NTFS. If a recognition problem persists, use a USB flash drive from another
manufacturer.
•

Kingston®:
DataTraveler G3 Series DataTraveler 100 G3 DT100G3
DataTraveler SE9 Series DataTraveler SE9 G2 3.0 DTSE9G2
Digital Data Traveler 3.0 USB Flash Drive - Violet DTIG4

•

SanDisk®:
Ultra Series SDCZ48-064G-J57
Cruzer Blade Series
Cruzer Glide Series CZ60 SDCZ60-064G-B35

•

Transcend®:
JetFlash 790 Series TS64GJF790KBE

•

PNY®:
Retract USB 3.0 Flash Drive, black (P-FD64GTRTC-GE)

•

Silicon Power®:
2 Pack USB 3.0/3.1 Gen1 USB Flash Drive Blaze B02

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Bulletin Number: 15-305-22R; Revised: 01/20/26

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Appendix 2
Download the Update Files to the USB
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:

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 4/Denso for Audio/
Navi then click on the applicable Hyperlink to download the file(s) to your SDS Notebook or PC:
Updates for Gen 4.5 Denso Audio and Navigation Head Units – 23-24MY LegacyOutback
23-24MYAscent24-26MYCrosstrek24-26MYImpreza24-25MYWRX
23-24MYLegacy23-24MYOutback23-24MYAscent24MYCrosstrek24MYImpreza24MYWRX Denso-CP1.5 AUDIO UPDATE- September 2025
•

Go to Downloads.

•

CAUTION: After download is complete, NEVER change the file or folder names.

•

Open / display the contents of File folder, for example: “F91WxM053-880”.

•

Click on “Extract All Files”.

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Bulletin Number: 15-305-22R; Revised: 01/20/26

Page 8 of 80

•

The screen similar to the one below will appear to set a destination for the extracted file.

•

Double-click on the required folder (for this example, used folder titled “F91WxM053-880”).

Copy all files then paste (or click / drag) it to the “clean” USB flash drive as listed (Removable Disk)
in the directory.

IMPORTANT NOTE: The update contains 3 folders and 2 files. When performing an update, the
USB must contain the matching number of folders and files and all files must be replaced.
ALWAYS use the latest files together as a set.
NEVER reuse or combine files from a prior update with a newer version.
Continued...
Bulletin Number: 15-305-22R; Revised: 01/20/26

Page 9 of 80

•

To avoid confusion, use a permanent marker to label the flash drive with the file contents (e.g.
Denso CP1.5 2023MY ALL).

•

Go to Step 4.

“B” When using update files sent directly from Nuspire:
•

Go to My Documents on the GUI screen click on the folder “Denso CP1 Audio-Navi Update
Files” to display the list of available update files shown below.

IMPORTANT: Always confirm there is a correct folder. If not, the SDS notebook hasn’t been
updated with the latest release. Please contact Nuspire to request they resend the update.”

•

CAUTION: After download is complete, NEVER change the file or folder names.

•

Double-click on the required folder (for this example, select the file entitled “CP15”) and the
update file will display as shown.

Select all folders and files and either copy / paste or click / drag them to the USB flash drive.
IMPORTANT NOTE: The update contains 3 folders and 2 files. When performing an update, the
USB must contain the matching number of folders and files and all files must be replaced.
ALWAYS use the latest files together as a set.
NEVER reuse or combine files from a prior update with a newer version.
Continued...
Bulletin Number: 15-305-22R; Revised: 01/20/26

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•

Once all files have been loaded onto the USB flash drive, right click on the drive and select
“Eject”.
CAUTION: NEVER change the file names.

•

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 (Denso CP1.5 2023MY ALL in this
example).

•

Proceed to STEP 4 below.

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Bulletin Number: 15-305-22R; Revised: 01/20/26

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Appendix 3
Perform the software update by USB
4a) PRESS and HOLD the RIGHT-side temperature control buttons (both up and down) and press
the Tune / Scroll knob 6 times then release all to display the Dealership Mode Menu.

4b) Select Software Update from the Dealership Mode menu.

IMPORTANT NOTE: On a RARE occasion, the message “Software update setup is
initializing…” may be displayed. Should this occur, proceed to Appendix 5 for further instruction.