BCM Wake-Up/Sleep State

The BCM performs these functions in the wake-up state. The BCM enters the sleep state when the following conditions exist:
^ Active control of system malfunctions stops.
^ Active monitoring of system malfunctions stops.
^ The BCM is idling.

The BCM must detect certain wake-up inputs before the BCM enters the wake-up state. The BCM monitors the inputs during the sleep state. This condition allows the BCM to switch between the awake state and the sleep state.

The BCM enters the wake-up state when receiving activity on any of the following inputs:
^ The instrument panel dimmer switch
^ The door lock (ajar) switch
^ The door lock switch
^ A keyless entry system signal
^ An inadvertent power (battery rundown) protection transition
^ The ignition switch in one of the following positions:
- LOCK
- OFF
- RUN
- ACC

The sleep state occurs when the following conditions exist:
^ The BCM stops active control of the system functions.
^ The BCM stops active monitoring of the system functions.

When the BCM detects a wake-up condition, the BCM enters the wake-up state. The conditions listed above are called Wake-Up Inputs. These wake-up inputs cause the BCM to change from a sleep state to a wake-up state. The BCM then begins 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 the following conditions exist:
^ No activity exists on the Class 2 serial data link.
^ The ignition switch is in the LOCK or the OFF position.
^ The BCM is not commanding any outputs.
^ No delay timers are actively counting.
^ No wake-up inputs are present.