Monte Carlo V6-3.4L VIN E (2000)
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Serial Data: provides an interface with the PCM, EBCM, Radio, SDM, DIC and the IPC through the Class 2 serial data link.
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Theater Dimming 1 Control: Supplies ground to activate the Footwell lamps.
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Theater Dimming 2 Control: Supplies ground to activate the inside rear view mirror lamps, non SEO dome lamp, and the roof rail
courtesy/reading lamps.
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:
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I/P dimmer switch.
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Door lock (ajar) switch.
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Door lock switch.
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A keyless entry system signal.
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Inadvertent power (battery rundown) protection transition.
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The ignition is turned to the LOCK, ACCESSORY or the ON 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:
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No activity on the Class 2 serial data link.
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The ignition switch is in the OFF position.
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The BCM is not commanding any outputs.
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No delay timers are actively counting (during theft deterrent re-learn).
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No wake-up inputs are present.
Content Theft (UA6 Option)
The Body Control Module features a content theft deterrent system which is designed to defer vehicle vandalism and theft. The content theft deterrent
system performs these functions:
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Flashes the headlamps
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Sounds the horns
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Disables fuel delivery to the engine
The BCM monitors the following:
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Status of the doors
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Lock cylinders
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Rear compartment lid
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Power door locks
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The keyless entry system
The BCM operates the headlamps, horns and the theft deterrent indicator, thats in the radio, according to the mode of operation the system is in. The
BCM also communicates a fuel enable signal to the Powertrain Control Module (PCM) when the system is armed. Refer to Content Theft Deterrent
(CTD) Operation in Theft Deterrent for more information.
RPO UA6: For a Description of RPO Code(s) shown in this article refer to the RPO Code List found at Vehicle/Application and ID See: Application
and ID/RPO Codes
Miscellaneous Functions
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BRAKE indicator lamp control: The BCM controls the state of the BRAKE indicator lamp based on the status of the parking brake switch by
sending a message to the instrument cluster via the Class 2 serial data link.
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Fog lamp enable control. The BCM controls fog lamp operation, based on the status of the ignition switch.
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Day/night mode sensing: The BCM determines the ambient light operating mode. The BCM then communicates the information to the Instrument
Cluster and Powertrain Control Module (PCM) via the Class 2 serial data link.
Passlock Theft Deterrent
The Passlock is a vehicle theft deterrent system. The Passlock theft deterrent system contains a Passlock sensor. The Passlock sensor is part of the
ignition lock cylinder assembly. The Body Control Module (BCM) provides power and ground to the Passlock sensor. The Passlock sensor interfaces
with the BCM through the Passlock detection circuit.
When turning the ignition switch to the start position with the proper key, the Passlock sensor generates an analog voltage signal. This signal is sent
through the Passlock detecting circuit. This analog voltage signal is of a specific value to the vehicle, and varies from vehicle to vehicle. When
attempting to start the engine, the BCM compares a preset stored analog voltage value with the signal coming from the sensor. Because both values
