Terraza FWD V6-3.5L VIN 8 (2005)
both local inputs and serial data inputs from other modules on the vehicle.
Discrete Ignition Signals
Those modules that have discrete 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 discrete ignition input to determine the current valid state. If the discrete ignition input is active, battery
positive voltage, the modules will fail-safe to the RUN power mode. If the discrete ignition input is not active, open or 0 volts, 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 vehicle.
BCM Wake-Up/Sleep States
The body control module (BCM) is able to control or perform all of the BCM functions in the wake-up state. The BCM enters the sleep state when
active control or monitoring of system functions has stopped, and the BCM has become idle again. The BCM must detect certain wake-up inputs
before entering the wake-up state. The BCM monitors for these inputs during the sleep state, where the BCM is able to detect switch transitions that
cause the BCM to wake-up when activated or deactivated. Multiple switch inputs are needed in order to sense both the insertion of the ignition key
and the power mode requested. This would allow the BCM to enter a sleep state when the key is IN or OUT of the ignition.
The BCM will enter a wake-up state if any of the following wake-up inputs are detected:
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Activity on the serial data line
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Detection of a battery disconnect and reconnect condition
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Headlamps are ON.
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Ignition is turned ON.
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Key-in-ignition switch
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Park lamps are ON.
The BCM will enter a sleep state when all of the following conditions exist:
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The ignition switch is OFF.
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No activity exists on the serial data line.
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No outputs are commanded.
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No delay timers are actively counting.
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No wake-up inputs are present.
If all these conditions are met the BCM will enter a low power or sleep condition. This condition indicates that the BCM, which is the power mode
master (PMM) of the vehicle, has sent an OFF-ASLEEP message to the other systems on the serial data line.
