🚗 Automotive · Sequence
Vehicle Software OTA Update
How a carmaker updates vehicle software over the air: campaign targeting, owner consent, download, safe installation and reporting.
Drawing diagram…
What this diagram shows
- Campaigns target specific models and VIN ranges
- Owners approve installation, and only when parked
- Each ECU update is verified, with rollback on failure
Prompt used
Vehicle OTA sequence: the OEM creates an update campaign for a model and VIN range, the OTA backend notifies the vehicle's telematics unit, the car downloads the signed package over 4G in the background, the owner is asked in the app and on the dashboard to install when parked, the vehicle checks battery and parking state, installs to each ECU with signature checks, reboots, verifies and reports success (or rolls back) to the backend.
Mermaid code
sequenceDiagram actor OEM as OEM Engineer participant OTA as OTA Backend participant TCU as Vehicle TCU participant ECU as Vehicle ECUs actor Owner OEM->>OTA: Campaign: Model X, VIN range OTA->>TCU: Update available TCU->>OTA: Download signed package (4G) TCU->>Owner: Install now? (app and dashboard) Owner-->>TCU: Install tonight, parked TCU->>TCU: Check battery above 50%, parked TCU->>ECU: Flash each ECU, verify signature ECU-->>TCU: Installed TCU->>TCU: Reboot and self-test TCU->>OTA: Success OTA-->>OEM: Campaign progress
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