BCM Wake-Up/Sleep State

The BCM performs its functions in the wake-up state. The BCM enters the sleep state when active control or monitoring of system malfunctions has stopped, or when the BCM is idling. The BCM must detect certain wake-up inputs before entering the wake-up state. The BCM monitors its inputs during the sleep state, allowing the BCM to switch between the two states, awake or asleep.

The BCM enters the wake-up state when receiving activity on any of these inputs:
^ I/P dimmer switch.
^ Door lock (ajar) switch.
^ Door lock switch.
^ A keyless entry system signal.
^ Inadvertent power (battery rundown) protection transition.
^ The ignition is turned to the LOCK, ACCESSORY or the RUN position.

The sleep state is when the BCM has stopped active control and monitoring of system functions and has become idle again. For the BCM to enter the wake-up state, the BCM must detect a wake-up condition, mentioned previously. These conditions are called wake-up inputs that cause the BCM to change from a sleep to a wake-up state and begin active control and monitoring. The BCM has the ability to monitor for these wake-up inputs in the sleep state. The BCM enters the sleep state when all of these conditions exist:
^ No activity on the Class 2 serial data link.
^ The ignition switch is in the OFF position.
^ The BCM is not commanding any outputs.
^ No delay timers are actively counting (during theft deterrent re-learn).
^ No wake-up inputs are present.