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Glossary · UNECE / Type Approval
RXSWIN
Regulation X Software Identification Number — identifier for the software set covered by a UN regulation type approval.
RXSWIN is the unique identifier that ties a specific software configuration of a vehicle type to its regulation-X type approval. Updates that change software covered by the approval must be traceable to a new or updated RXSWIN under R156's SUMS rules.
Why it matters
RXSWIN is what keeps a type approval valid as software changes. Every update to regulated software must map to an RXSWIN under UNECE R156, so teams need traceability from the software configuration to the approval — exactly the link that breaks first in manual, document-driven processes.
Related terms
UNECE R156
UN Regulation requiring a certified Software Update Management System for type-approved vehicles.
Software Update Management System (SUMS)
Process system covering planning, distribution, and recording of vehicle software updates.
OTA Update
Over-the-air software update delivered to a vehicle ECU after manufacture.
Need help applying RXSWIN on a programme? Use the contact form or request a KAVACH demo.