Trace a vehicle property from an ECU boundary through VHAL and Car Service to an Android Automotive application.
AAOS bugs often sit at integration boundaries. A single property may cross an ECU interface, HAL contract, framework service, permissions layer and application API before a user sees it.
A property can be valid at one layer and broken at the next.
Permissions and framework contracts are part of the signal path.
Diagnostics should identify the first boundary where state diverges.
CAN / SOME-IP
Vehicle interface
Vehicle properties
Framework service
Permission boundary
UX + business logic
The diagram is intentionally architectural rather than vendor-specific. Use it as a mental model, then map the components to the actual environment.
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