How do airbag deployment systems achieve reliable operation in crash events?

Airbag systems achieve reliability through: Redundant crash sensors (satellite sensors plus ACU internal sensors), multiple processor architecture with voting/comparison, continuous self-diagnostics (sensor, squib circuit, processing), safing sensor preventing deployment from single sensor, fast ADC and processing (deployment decision in 15-30ms), energy reserve capacitor for deployment even with battery disconnect, squib firing circuit diagnostics, and comprehensive fault monitoring with warning lamp. ASIL-D requirements drive architecture. Algorithm tuning differentiates crash types and severities, controlling which bags deploy. Post-crash recording captures event data for analysis.