The Body Control Module

The SBM will enter a wake-up state if any of the following wake-up inputs are detected:
^ Any activity on the serial data line.
^ Any accessory function.
^ The door handle switch (class 2 message from the DMM).
^ The door jamb switch (class 2 message from the DMM).
^ The door lock switch open or close (class 2 message from the DMM).
^ An RFA signal.
^ An inadvertent power transition.
^ The key in the ignition switch.
^ The following components are ON:
- Park lamps
- Fog lamps
- Headlamps
^ The SBM experiences a battery disconnect condition.
^ The SBM experiences a reconnection condition.
^ The ignition is turned to RUN.

The wake-up state is the state in which the Body Control Module (SBM) is able to control/perform all of the system's functions. The sleep state is when the following conditions occur:
^ The SBM stops active control.
^ The SBM stops monitoring of the system functions.
^ The SBM becomes idle again.

In order for the SBM to enter the wake-up state, the SBM detects certain wake-up conditions. The conditions are called wake-up inputs. The wake-up inputs cause the SBM to perform the following functions:
^ Change from a sleep state to a wake-up state.
^ Begin active control.
^ Begin active monitoring.

The sleep condition indicates that the SBM, which is the power mode master of the vehicle, sent a message to the other systems on the serial data line in order to stop broadcasting the state of health message.