Ignition Signal Monitoring

The modules that monitor ignition signal inputs also remain in the state dictated by the last valid PMM message received on the serial data circuits. They then check the state of their ignition voltage input to determine the current valid state. If the ignition input is active and battery voltage exists, the modules will fail-safe to the RUN power mode. If the ignition input is not active and voltage is zero, the modules will fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the class 2 data line.