NHTSA ID Number: 11010908
Manufacturer Communication Number: 15-311-23R
TSB/Document Date: 2024-12-02
Summary
This bulletin provides instruction for use of a new reprogramming procedure to optimize the Denso Gen 4.5 Audio and Navigation system utilized in the models 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
© 2023 Subaru
of America, Inc. All rights reserved.
SERVICE BULLETIN
NUMBER: 15-311-23R
APPLICABILITY: 2023-25MY Outback & Legacy
2023-25MY Ascent
DATE: 06/23/23
2024MY Crosstrek/Impreza
REVISED: 11/07/24
2025MY Forester
SUBJECT:
FOTA (Firmware Over-The-Air) Reprogramming
for DENSO Gen 4.5 Audio Navigation Infotainment
Systems via DCM
INTRODUCTION:
This bulletin provides instruction for use of a new reprogramming procedure to optimize the
Denso Gen 4.5 Audio and Navigation system utilized in the models listed above. Firmware-overthe-air (FOTA) is a process where remote devices can receive updates to their operating firmware.
This process has become second nature with smartphones, tablets and many other connected
devices. FOTA for automotive infotainment systems was designed with an emphasis on customer
convenience. FOTA updates provide regular enhancements along with software patches as needed to
enhance the customer experience. The convenience factor comes not only with the supply of regular
updates and the enhancements they provide, but through customer control of when these updates are
downloaded and installed. The only requirement is a valid subscription to SUBARU STARLINK
Safety Plus, since the download of the software is performed via DCM. FOTA operation is
conducted in two steps: download (from the server to the vehicle via DCM) and installation (internal
to CP1.5 system in the vehicle). This bulletin will focus on FOTA for Denso Gen 4.5 audio systems
(MID) and audio-navigation systems (HIGH) which utilize the 11.6-inch touch-screen display.
Models with 7-inch dual screen display (Base) are not FOTA update capable.
This bulletin outlines the procedure for performing FOTA updates successfully. These procedures
involve:
•
Assisting customers with FOTA -related concerns if they have been unsuccessful in
performing the FOTA by themselves. (Possible vehicle or system concern.) *
•
Performing the FOTA update for customers who are not comfortable or need assistance with
performing it themselves but have requested the Retailer to install it*
•
Updating the firmware using a USB flash drive by following the steps outlined in TSB
15-305-22R “Reprogramming File Availability for Optimization of Gen 4.5 Denso CP1.5
Infotainment Systems” when FOTA cannot be performed due to the setup or eligibility
constraints*.
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: 15-311-23R; Revised: 11/07/24
Page 1 of 13
* NOTE: If a customer is simply requesting help with how to perform FOTA, provide a copy of the
appropriate customer instructions for FOTA available on Subarunet: Service Operations & Technical
> Forms/Downloads page.
See Appendix A later in this bulletin for more information.
It is VERY IMPORTANT to read and understand this information completely before proceeding.
NOTES:
•
REMINDER: FOTA is available for MID and HIGH (Navi) systems with 11.6-inch display
only.
•
The currently available FOTA firmware version is not the same version available to Retailers
for USB updating use. However, a system updated using FOTA can be further updated by
using the USB update procedure if additional updates are needed. For additional details
clarifying the scope of FOTA updates, review the applicable Owner’s Manual Supplement’s
additional information for the Center Information Display. The information is downloadable
from: https://www.subaru.com/ owners/index.html. See Appendix C below for more
information.
•
FOTA updates are for the system firmware ONLY. Map updates are a separate function which
the customer may update on their own by using either USB download or Map Over the Air
Update (MOTA). Go to: subaru-maps.com for more information.
Reference photos of each system faceplate are supplied below:
SERVICE PROCEDURE / INFORMATION:
REMINDER: Customer satisfaction and retention starts with performing quality repairs.
The FOTA update process involves a remote downloading and installion the update firmware
therefore, time duration depends on signal strength and transfer rate performance. During installation,
the infotainment system’s functionality will be restricted.
Continued...
Bulletin Number: 15-311-23R; Revised: 11/07/24
Page 2 of 13
SET-UP INSTRUCTIONS AND CAUTIONS:
•
Move the vehicle to an outside location where the engine can be safely started and kept idling
during the update process.
•
Never idle the vehicle in a closed space such as a garage, even if the garage door is kept open.
•
Once the vehicle is in a safe location, be sure the vehicle is in Park (CVT) or Neutral (MT)
and the parking brake is fully engaged.
•
Open one or more windows to ensure fresh air is available.
•
Stay with the vehicle until the update is completed.
•
We suggest adjusting the climate controls to your desired settings in case they become
unavailable during the update process.
•
Unplug any devices, chargers, cables or other USB drives from the vehicle’s USB and power
ports.
VERY IMPORTANT: Before proceeding with the updating procedure, the currently installed
version ID MUST be confirmed (Firmware Version Check) by following the steps below:
1) After starting the engine and system boot-up completes, from the HOME screen, touch the
Settings button.
Continued...
Bulletin Number: 15-311-23R; Revised: 11/07/24
Page 3 of 13
2) Press the General button. Use the down arrow to scroll to System Information then press to
display the System Information / Version information.
The examples below identify the head unit model and the last 6 digits 9xxx-xxx) signify the software
version number. Examples:
•
F71WHMxxx-xxx or F61WHMxxx-xxx (High model software)
•
F71WMMxxx-xxx or F61WMMxxx-xxx (Mid model software)
MY
Carline
Trim/Grade
MID
23-25MY
Outback/Legacy
HIGH
Installed Software Versions
Available Software Version
033-270
043-270
073-270
033-570
043-570
073-570
033-681
043-670
073-670
043-781
073-770
053-880
073-870
073-980
not eligible for FOTA
033-270
043-270
073-270
033-570
043-570
073-570
033-681
043-670
073-670
043-781
073-770
053-880
073-870
073-980
not eligible for FOTA
Continued...
Bulletin Number: 15-311-23R; Revised: 11/07/24
Page 4 of 13
MY
Carline
Trim/Grade
MID
23-25MY
Ascent
HIGH
MID
24MY
Impreza/Crosstrek
HIGH
MID
24MY
WRX
HIGH
MID
25MY
Forester
HIGH
Installed Software Versions
Available Software Version
033-570
043-570
073-570
033-681
043-670
073-670
043-781
073-770
053-880
073-870
073-980
not eligible for FOTA
033-570
073-570
033-681
073-670
043-781
073-770
053-880
073-870
073-980
not eligible for FOTA
033-681
043-670
073-670
043-781
073-770
053-880
073-870
- 💯【Conta.ct us for Support Directly】If you met any...
- 🔥🔥🔥【2026 AUTEL FLAGSHIP MK900BT MK900-BT, NEW...
- 🚗【3000+ ACTIVE TESTS (50➡3000+), SAME AS MS...
- 🚗【40+ HOT SERVICES FOR 150 MAKES (28+➡40+)】Full...
- 🚗【OE ALL SYSTEM DIAGNOSE, AUTO SCAN 2.0: SCAN LICENSE...
- 【TURN OFF CEL】 This AL319 car scanner diagnostic tool...
- 【EXTENSIVE APPLICATION】 Autel AL319 Compatible with...
- 【FOR END USER & DIYERS】 This error code reader AL319 is...
- 【USER-FRIENDLY DESIGN】 This OBD2 scanner and check...
- 【HIGH-QUALITY SERVICES】 12 months war.ranty from the...
Last update on 2026-06-12 / Affiliate links / Images from Amazon Product Advertising API
If the PDF is very large, it may not load in the preview below.
Some older TSBs had multiple PDFs — visit the NHTSA Website to view all PDFs.
If the TSB PDF does not show, download or view it on the NHTSA Website.
Click on the (+) Plus Sign
Then Click on Associated Document(s)
Search NHTSA Database for Recalls
Search NHTSA Database for Vehicle Investigations
View Latest Vehicle Investigations
Search NHTSA Database for Vehicle Complaints
View Latest Vehicle Complaints
TSB/Document ID: 15-311-23R
Replacement Service Bulletin Number:
MFR Communication Date: 2024-11-07
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
- [2026 Top-Tier Hardware and Software Upgrade]: Topdon ArtiDiag900 Lite scanner has enhanced hardware and latest features, including Android 11.0, 5x faster CPU, 10000mAh battery for 12 hours of continuous operation, stable wireless diagnosis with Bluetooth 5.0, 8-inch touchscreen. Added bi-directional control, wireless diagnosis, battery testing (optional), and DTC repair guide
- [TOPDON Bidirectional Scan Tool]: This bidirectional obd2 scanner sends commands to the vehicle's ECU for active testing, enabling users to accurately and quickly locate faulty components such as injectors, coolant pumps, windows, wipers, headlights, mirrors, etc. The bidirectional control scanner is the ideal choice for workshops/automotive repair shops as it significantly reduces mechanic's diagnostic time.
- [Wireless Bluetooth Diagnostic Experience]: The AD900 Lite scan tool comes with a Bluetooth 5.0 VCI, supporting a wireless diagnostic range of up to 33 feet (10 meters), allowing you to diagnose without being confined to cables or tight spaces. Stable and fast wireless diagnosis provides a comfortable repair environment. It also offers VCI cables to increase connectivity options.
- [DTC Repair Guide Function]: Easily diagnose issues with your vehicle and receive guidance on repairs with the topdon scan tool's fault code definitions for all systems,maximize your diagnostic capabilities. This function is compatible with Chrysler
/Dodge/Jeep/Fiat 2010-2014 and expanding with continual updates,the AritDiag 900 Lite car diagnostic scanner is the must-have tool for any technician or DIY enthusiast. - [OE-Level Full System Diagnostics]:AritDiag900 Lite full system diagnostic scanner can scan ALL available modules(Engine, Transmission, Airbag, ABS, ESP, TPMS, Gateway, Steering, Radio, Air conditioning, ect.) to✔read ECU info, ✔read/clear codes, ✔view live data stream, ✔retrieves freeze-frame, ✔perform active tests, and more. With just a simple click, it provides you with accurate and in-depth diagnostics.
- Bi-Directional Control, Quickly Locate Problems: Turn your phone into a professional diagnostic tool. You can send commands from your phone to the ECU to test injectors, cooling fans, headlights, A/C clutch, windows, wipers, and more. See which one doesn't respond. Helps you quickly locate the problem and save time. No need to tear things apart, avoid blind disassembly.
- Flexible Subscription, Choose Advanced Features as Needed: TopScan Lite provides free-for-life access to core diagnostics, including full system scan, code reading, performance tests, and repair information. After purchase, advanced features (bi-directional control, service operations, live data, code clearing, and AI functions) are free-for-the-first-year. After the first year, if you want to use advanced features, you need to subscribe on a monthly, quarterly, or yearly basis. As new models and reset functions are updated, the tool will also be continuously upgraded.
- Full System Diagnostics, No Fault Hides: Unlike basic diagnostic tools that only cover 4 systems, TopScan can scan all systems. Read and clear trouble codes, view live data streams, and generate a complete vehicle health report – all issues are clear at a glance. Covers 10,000+ vehicle models and is compatible with 99.99% of vehicles.
- AI Assistant - TopFix: Think of TopFix as your personal AI mechanic. It leverages a repair database and OEM data to deliver clear, step-by-step repair solutions. Features include AI Q&A, one-click translation, and a full repair log, making your diagnostic process simpler and more efficient.
- 8+ Hot Resets, Keep Your Car in Top Shape: One-tap resets for oil, throttle, EPB, steering angle, DPF, ABS, BMS, and airbag. It enables car owners to easily perform essential maintenance, ensuring the vehicle stays in optimal condition and extends its service life.
- Dual WiFi & 10.1" Touchscreen: Provides a stable, high-speed wireless link 3x faster than bluetooth, and a responsive, professional interface. Topdon ONE obd2 scanner diagnostic tool ensures smooth, non-lagging diagnostic scan, boosting mechanic efficiency
- J2534 Pass-Thru Support: The included ONE VCI supports the J2534 standard, allowing it to function as a pass-thru device when paired with OEM diagnostic software.Through TOPDON’s RLink platform, technicians can perform dealer-level coding, expanding in-house capabilities without investing in multiple factory automotive scan tools
- OE Topology Mapping: Visualize the vehicle’s ECU network exactly as it’s built.Zoom, pan, and highlight specific modules to pinpoint component issues with precision.Topology mapping displays real-time communication between modules
- 50 Plus Service Functions: Covers high-demand services like ADAS calibration, DPF regen, TPMS reset, ABS bleed, and throttle adaptation.Expands your service menu, allows you to charge premium rates, and turns away zero jobs due to lack of tooling. Vehicle-specific functionality may vary
- Advaned ECU Coding: 10 of the most serviced brands in North America, including full ECU coding and flash hidden support for BMW, VW, Au-di, Benz, Porsche, Toyota, Ni ssan and more. Enables module replacement, feature customization, and personal settings with automatic backup or restore.Lets your shop safely offer high-margin customization services, attracting more customers and boosting profit
Last update on 2026-06-12 / Affiliate links / Images from Amazon Product Advertising API
This product presentation was made with AAWP plugin.