Discrete Power Mode Signals
WARNING: This page is about a different car, the 2006 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
Those modules that have Run/Crank signal inputs also remain in the state dictated by the last valid power mode message from the IPM or the RCDLR. They then check the state of their Run/Crank Ignition 1 voltage input to determine the current valid state. If the discrete ignition input is active, the modules will fail-safe to the Run power mode. If the discrete ignition input is inactive, the modules will fail-safe to Off-Awake power mode and shut down after a while if no other conditions require them to be awake.