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Service bulletin M1579

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10232450
Published by NHTSA2023-03-04
Manufacturer's numberM1579
Manufacturer's date2023-02-14
NHTSA componentELECTRICAL SYSTEM; EQUIPMENT

NHTSA's summary

SERVICE BULLETIN M1579 (REV B): REVOLUTION MAX BCM AND ECM UPDATE. PURPOSE: REVISION. This bulletin informs dealers that a BCM and Electronic Control Module (ECM) update is available on Digital Technician II (DT II). Revision: Updated Body Control Module (BCM) part numbers. Updated Part Numbers Affected.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, Equipment and accessories

Vehicles listed
HARLEY-DAVIDSON RA12502021 to 2023
HARLEY-DAVIDSON RA1250S2021 to 2023
HARLEY-DAVIDSON RH1250S2021 to 2023
HARLEY-DAVIDSON RH9752022 to 2023
HARLEY-DAVIDSON RH975S2023

Listing a model year does not mean every vehicle of it is concerned: the document says which.