UNECE WP.29 R156 7.2.2.5: Vehicle checks preconditions before executing an update

What does 7.2.2.5 require?

The vehicle ensures that preconditions must be met before a software update is executed; the Interpretation Document expects the manufacturer to define the preconditions and confirm they are met whenever an update starts (ISO 24089 7.3.4.3).

Maintained by Gerard BlokdykVerified against the published standard 31 May 2026Control text last updated 21 May 2026

Other controls in Paragraph 7.2: Requirements for the vehicle type – UNECE WP.29 R156

7.2.1.1 7.2.1.1 Protect the authenticity and integrity of software updates on the vehicle
7.2.1.2.1 7.2.1.2.1 Each RXSWIN uniquely identifiable and updated on extension or new approval
7.2.1.2.2 7.2.1.2.2 RXSWIN or software versions readable through a standard interface
7.2.1.2.3 7.2.1.2.3 Protect RXSWINs and software versions on the vehicle against unauthorised modification
7.2.2.1.1 7.2.2.1.1 Restore the previous version or reach a safe state after a failed or interrupted update
7.2.2.1.2 7.2.2.1.2 Execute updates only with enough power to complete or recover
7.2.2.1.3 7.2.2.1.3 Technical means ensure safe execution where an update may affect safety
7.2.2.2 7.2.2.2 Inform the user before execution: purpose, changes, duration, unavailable functions, instructions

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