How do you design a comprehensive vehicle diagnostics architecture?

Diagnostics architecture design includes: Defining diagnostic communication topology (gateway routing, diagnostic addressing), UDS service implementation per ECU requirements, DTC management strategy (fault storage, aging, healing), freeze frame and extended data capture, security access levels protecting critical functions, EOL programming and configuration procedures, and logging for field analysis. Architecture must support factory testing, service diagnostic tools, OBD compliance, and connected vehicle diagnostics. Key challenges include maintaining backward compatibility, managing diagnostic data growth, and enabling remote diagnostics while ensuring security. ODX/PDX standards define diagnostic data exchange.