S15/T15 Sonoma P/U 2WD L4-2.2L VIN 5 Flex Fuel (2001)
Body Control Module: Description and Operation
WAKE-UP STATE
The BCM performs the BCM functions in the wake-up state. The BCM enters the sleep state when the 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 the BCM inputs during the sleep state, allowing the BCM to switch between the 2 states. The BCM wake-ups are as follows:
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Door ajar switches
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Door handle switches
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Dome lamp
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Park lamps
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Power door lock switches
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Interior lamp request active
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Ignition key put into the ignition switch
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Ignition key removed from the ignition switch
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Ignition in the RUN position
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Key in door lock switch
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RFA request to the BCM
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Any Class 2 communication requiring BCM interaction
ASLEEP STATES
The BCM is asleep when the BCM has stopped controlling or monitoring devices and has become idle again. After the ignition switch is turned to the
LOCK position and 20 minutes (1216 seconds) elapse without any Wake-Up signals, the BCM enters into an asleep state and goes into the low power
mode. If the BCM is in low power mode and detects a wake up, the BCM will enter into the wake-up state and enter the high power mode. If the
vehicle has been left inactive (ignition in the LOCK position and no BCM wake-ups) for 20 minutes, the BCM will return to the low power mode.
BCM CONTROLLED/AIDED FUNCTIONS
The BCM controls/aids the following functions. For additional circuit information and descriptions, refer to the appropriate sub-system.
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RKE Remote Keyless Entry/Panic Alarm/LOCKING and UNLOCKING of Doors/Lockout Prevention
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DRL Daytime Running Lamps/Auto Headlamps/Exterior Lighting
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VTD Vehicle Theft Deterrent/Passlock(TM) System
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Inadvertent Power Relay/Battery Rundown Protection
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RAP Retained Accessory Power
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Interior Lighting
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Audible Warnings
Detailed descriptions of functions reside within the respective sub-subsystem circuit description and operation.
