NHTSA ID Number: 11033059
Manufacturer Communication Number: 15-332-26
TSB/Document Date: 2026-06-01
Summary
This bulletin announces the availability of reprogramming files and provides a procedure for installing a software update to optimize Denso-Ten head units.
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
© 2026 Subaru of America, Inc. All rights reserved.
SERVICE BULLETIN
APPLICABILITY:
SUBJECT:
2026MY Solterra
Reprogramming File Availability for Optimization
of Denso-Ten Infotainment Systems
NUMBER:
15-332-26
DATE:
04/30/26
INTRODUCTION:
The following information announces the availability of reprogramming files and provides a
procedure for installing a software update to optimize Denso-Ten head units. The procedure involves
either downloading the software update files from Subarunet or using those sent directly from
PDI (Nuspire) to the SDS Notebook, then transferring them onto a USB flash drive for head unit
installation. This update includes several enhancements. For details on this update and previous
updates, please refer to Appendix 2.
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 vehicle and allowing the head unit to boot up completely, from the HOME
screen, press the Settings (gear icon) button.
1b) Press
>Software Update > Model info.
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: 15-332-26; Date: 04/30/26
Page 1 of 7
1c) Is the software version 2222?
•
Yes –The system is up to date. Performs diagnostics as per the applicable service manual.
•
No – Continue to Step 2.
Step 2: Prepare a USB flash drive
Note: The 2026 Solterra is only equipped with a USB Type-C port. You must use a USB Type-C flash
drive or a USB Type-A flash drive with a USB Type-A to Type-C adapter that supports data transfer.
Flash Drive specs must be:
USB communication format
USB 2.0 or newer. USB 3.0 has proven to be faster.
File format
FAT 32
Memory capacity
Must be 4 to 32 GB
CAUTION: Do not use any USB flash drive that uses file-organizing software or an operating
system.
VERY IMPORTANT: Before attempting to download any data files, confirm that the PC and flash
drive being used are not infected with any virus. Then format the flash drive to FAT32.
•
Make sure the USB flash Drive is empty
•
Right Click on the corresponding “Removable DISK”
•
Select “Format”
•
From the File System Drop-Down menu, Select “FAT 32”
•
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 flash drive:
Transfer the ZIPPED files to the USB Flash Drive following Appendix 1, “Download the Update
Files to the USB”.
Note: Do not extract the files; the zip folder needs to be saved directly to the blank USB flash drive as
shown below:
Continued...
Bulletin Number: 15-332-26; Date: 04/30/26
Page 2 of 7
STEP 4: Push the ignition switch to put the vehicle in READY-ON mode, apply the parking brake
and select “N” on the rotary shifter.
STEP 5: Insert the flash drive containing the correct software update into the vehicle’s leftside USB
port marked with the USB ( ) icon.
Note: A “Checking USB memory” message will display. This message can be displayed for up to 10
minutes.
STEP 6: Press
> Software update > Update Software > Continue > Agree
Note: The content displayed on the “Terms of Service” screen may not display correctly during the
update process. This condition does not affect the update. Please continue with the procedure as
instructed.
Note: If the “Update Software” button is not displayed on the software update screen, perform the
following. Select “View” on the software update screen. Then select “OK”.
STEP 7: Wait for the update to finish downloading. A progress bar will display the installation status.
A banner will appear when the update is complete, stating “Software installation complete.”
Continued...
Bulletin Number: 15-332-26; Date: 04/30/26
Page 3 of 7
Note: In some cases, the head unit may generate a completion report and automatically save it to the
flash drive. This .json file is not required and should be deleted from the flash drive.
STEP 8: After “Updated version after vehicle restart” is displayed, restart the vehicle by turning the
ignition switch off. Open and close the driver’s door twice. Then turn the ignition switch on and wait
two minutes. Once the head unit has successfully booted up, remove the flash drive. Reperform the
steps outlined in Step 1 and verify that the software version is 2222.
Caution: Failure to perform step 8 can cause a pop-up shown below. If this pop-up appears,
insert a blank USB drive. Press
>Software Update > Output info to USB memory. Remove
the flash drive once the prompt that .json files are extracted. Delete these files from the USB
flash drive.
STEP 9: Perform a complete system scan. Clear any DTCs set during the software update. If any
DTCs return, diagnose them according to the applicable service manual.
Continued...
Bulletin Number: 15-332-26; Date: 04/30/26
Page 4 of 7
WARRANTY / CLAIM INFORMATION:
For vehicles within the Basic New Car Limited, or covered by an active Subaru Added Security Gold
plan, this repair may be submitted using the following claim information:
Labor Description
Labor Operation #
Labor Time
Fail Code
DENSO TEN AUDIO UNIT SOFTWARE UPDATE
A810-286
.6h
ZWD-48
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: 15-332-26; Date: 04/30/26
Page 5 of 7
Appendix 1
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 PDI(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 remain zipped.
Using the normal audio / navigation system file
update download procedure: Go to Subarunet,
select Service Operations and Technical>>Forms/
Downloads>>Solterra Resources then click on the
applicable Hyperlink to download the file(s) to your
SDS Notebook or PC:
•
Go to Downloads.
•
CAUTION: After download is complete,
NEVER change the file or folder names.
•
“B” When using update files sent directly from PDI(Nuspire):
From the Toughbook home screen, navigate to the My Documents > Solterra > MY2026 to
locate the update file.
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 and the update file will display as shown.
• Select all the zipped files and either copy / paste or click / drag them to the USB flash drive.
• 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.
•
Continued...
Bulletin Number: 15-332-26; Date: 04/30/26
Page 6 of 7
Appendix 2
Symptoms Addressed by Update
Number
Symptoms Addressed by Update
1
While streaming audio via Wireless CarPlay there is a noticeable crackle/static interruption/skip at ~1
minute intervals. Music, podcasts and audio books apps all experience this phenomenon.
2
While using Wireless CarPlay for phone calls the audio cuts out and the caller can no longer be heard in the
cabin and the receiver cannot hear the caller. The audio mutes on both sides of the conversation.
3
When an Android device is paired to the vehicle, if the Android device is not present in the vehicle, an
Android Auto Connection error appears.
Bulletin Number: 15-332-26; Date: 04/30/26
Page 7 of 7
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TSB/Document ID: 15-332-26
Replacement Service Bulletin Number:
MFR Communication Date: 2026-05-08
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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