NHTSA ID Number: 11027538
Manufacturer Communication Number: M1490
TSB/Document Date: 2026-01-09
Summary
SERVICE BULLETIN M1490 (V 26.1.5): DIGITAL TECHNICIAN II - UPDATES AND RELEASE NOTES. PURPOSE: Revision. This bulletin informs dealers that Harley-Davidson has made a software update to Digital Technician II (DT II). DIGITAL TECHNICIAN II (PART NUMBER: HD-48650). New Software Update Version 26.1.5. Release Date: Week of December 15, 2025. NOTE: Software version (26.1.5) will need to be manually installed. Refer to bulletin M1713 for instructions. New Features, Changes: 2026 Revolution® Max Vehicles (RH975, RH975S, RH1250S, RA1250S, RA1250ST), 2026 Police Body Control Module (BCM), and Tire Pressure Monitoring System (TPMS). NOTE: Digital Technician II (DT II) supports additional Harley-Davidson motorcycle models and model years outside of those listed.
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TSB/Document ID: M1490
Replacement Service Bulletin Number:
MFR Communication Date: 2025-12-18
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: WHEELS
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
SERVICE BULLETIN
M1490
2025-12-17
M1490 (V 26.1.5): DIGITAL TECHNICIAN II - UPDATES AND RELEASE NOTES
• Calibration support (including Michelin Anakee Wild tire
selection)
Purpose for Service Bulletin
This bulletin informs dealers that Harley-Davidson has made
a software update to Digital Technician II (DT II).
• Module replace support
DIGITAL TECHNICIAN II (PART NUMBER: HD-48650)
• Guided Diagnostics
Markets Affected
Changes
All markets are affected.
• Guided Diagnostics: Fixed missing 2026 Police Body Control
Module (BCM) Diagnostic Trouble Code (DTC) U027300
New Software Update
NOTE
The TECHLINK 3 (PART NUMBER: HD-48650-TL3) supports
Controller Area Network (CAN) and J-1850 protocol vehicles.
• 6-pin CAN vehicles are recommended to use Techlink 3
(TL-3)
• All 2021 (and later) vehicles must use TL-3 (connects to Red
DLC on the vehicle)
• 4-pin (J-1850) vehicles are recommended to use TL-3. This
includes all Fuel Injected Harley-Davidson vehicles 2002
and later.
TECHLINK 3 (PART NUMBER: HD-48650-TL3) will not support
Buell, VDO and Magneti Marelli vehicles (4-pin DLC). Support
for those vehicles is available via TECHLINK II (PART
NUMBER: HD-48650-1).
For dealerships with firewall implementation, the URLs below
need to be white listed:
• Vehicle Setup
• Vehicle Setup - Tire Pressure Monitoring System (TPMS) Tire Selection – Add logic to confirm Electronic Control
Module (ECM) calibration is at proper version before allowing
Michelin Anakee Wild tire selection.
Version 26.0.2
Release Date:
• Week of November 18, 2025
New Features
2026 Vehicles
• Calibration support
• Module Replace support
• Guided Diagnostic support
• Variable Valve Timing (VVT) feature support for vehicles
with Engine Character “N”
• Updated Diagnostic Trouble Code (DTC) support
• htpps://hdpublicfacadesvc.bosch-automotive.com
• Support Auxiliary Load Controller (ALC) on Police vehicles
• htpps://keycloak.bosch-automotive.com
• Support 2026 Infotainment Control Unit (IFCU) speaker
configurations
Version 26.1.5
2025 Softail
Release Date:
• Updated BCM software
• Week of December 15, 2025
LiveWire S2DM/MH/AP EV3
NOTE
Software version (26.1.5) will need to be manually installed.
Refer to bulletin M1713 for instructions.
New Features
• Updated calibration bundle 10.1.9/10: Vehicle Supervisory
Controller (VSC), Onboard Charger (OBC), Rechargeable
Energy Storage System (RESS), Telematic Control Unit
(TCU), BCM
• Features: Vehicle capability of reverse and roll-forward regen
2026 Revolution® Max Vehicles (RH975, RH975S, RH1250S,
RA1250S, RA1250ST)
Changes
• DT II License Error – updated text
• Vehicle Identification Numbers (VINs)
• Advance Audio Radio Reflash – Fixed error on J1850
vehicles
NOTE
In the interest of preserving customer safety and satisfaction, always check for outstanding recalls whenever any motorcycle is brought into your dealership for either maintenance or service.
ROUTING
INITIAL HERE
SERVICE
MANAGER
SALES MANAGER PARTS MANAGER
WARRANTY
PROCESS
MANAGER
LEAD TECHNICIAN TECHNICIAN NO. 1 TECHNICIAN NO. 2 TECHNICIAN NO. 3 RETURN THIS TO
• External power required for Speedometer (SPDO), Anti-lock
Braking System (ABS), Electro Hydraulic Control Unit
(EHCU) modules during reflash
• Ignition ON required for ECM, ALC, Heated Seat Module
(HSM) modules during reflash
• Removed Vehicle Status notification to LiveWire for
instrument update
System Information
• Improved load performance
• IFCU - Hide AMP2 fields when module is not present
Required Dealer Action
Techlink
• The TECHLINK 3 (PART NUMBER: HD-48650-TL3) will
support CAN protocol vehicles (6-pin Data Link Connector
(DLC)) at launch. J-1850 protocol (4-pin DLC) support is
planned for early 2020.
• Techlink 3 will not support Harley-Davidson Buell, Vereinigte
DEUTA–OTA (VDO) and Magneti Marelli vehicles (4-pin
DLC). Support for those vehicles is available via TECHLINK
II (PART NUMBER: HD-48650-1).
• 2021 vehicles must use TECHLINK 3 (PART NUMBER:
HD-48650-TL3) (connects to Red DLC on the vehicle).
Digital Technician™ II
• The Digital Technician II software version updates are
automatic and occur while connected to the Internet.
• If an internet connection is lost, the download continues from
where it stopped.
• If the Digital Technician II software is open, the application
prompts the user to exit before the install can continue.
• All Digital Technician II software updates are deployed
automatically via the XMS agent software and require a
minimum model year software version (example: Model Year
2021 = minimum version v21.0).
2/2
M1490
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