Discrete Ignition Signals

Modules that have discrete ignition signal inputs also remain in state dictated by last valid BCM message received on serial data circuits. Modules then check state of their discrete ignition input to determine current valid state. If discrete ignition input is active (B+) modules will fail-safe to RUN power mode. If discrete ignition input is not active (open or zero voltage) modules will fail-safe to OFF-AWAKE mode. In this state, modules are constantly checking for a change status message on serial data circuits and can respond to both local inputs and serial data inputs from other modules.