Corvette V8-5.7L VIN G (1997)
^
Hood Ajar Switch - provides hood ajar status to the BCM.
^
Ignition Switch - provides the BCM with ignition position status.
^
Key In/Out Ignition Switch - allows the BCM to detect when a key is in or out of the ignition.
^
Monitored Loads - monitors electrical loads left ON after the ignition switch is turned OFF.
^
PASS-Key(R) Resistance - determines the resistance of the key for the PASS-Key(R) system.
^
Rear Defogger Switch - provides rear defogger switch activation input to the BCM in order to turn the rear defogger ON or OFF.
^
Turn Signal Monitor, LH/RH - monitors the turn signal status for the DRL.
The BCM directly controls the following outputs. Other systems may request the BCM to control These outputs for certain functions:
BCM Outputs
^
Backup Lamp Relay - provides output control in order to energize the backup lamp relay for UTD and Approach Lighting.
^
Column Lock/Unlock Control - controls the steering column lock/unlock motor position.
^
Console Lamp Dimming Control - controls the console lamp illumination when the headlights or the parklights are ON.
^
Courtesy Lamp Relay - provides output control in order to energize the courtesy lamp relay when an ON request is received.
^
DRL Relay, LH - the energized relay allows the BCM to use the LH front turn signals for DRL, Approach Lighting, and UTD functions.
^
DRL Relay, RH - the energized relay allows the BCM to use the RH front turn signals for DRL, Approach Lighting, and UTD functions.
^
Fog Lamp Relay, Front - provides output control in order to energize the front fog lamp relay when an ON request is received.
^
Fog Lamp Relay, Rear - provides output control in order to energize the rear fog lamp relay with a fog lamp switch ON request, or for
Approach Lighting and UTD functions.
^
Horn Relay - allows the BCM to energize the horn relay for UTD and RFA system functions.
^
HVAC Lamp Dimming Control - controls the HVAC lamp illumination when the headlights or the parklights are ON.
^
Monitored Load Relay - provides output control for the load monitor relay, allowing the BCM to shut off certain electrical loads in order to
prevent battery rundown.
^
PRNDL Lamp Control - controls the PRNDL lamp illumination when the headlights or the parklights are ON (A/T only).
^
Rear Defogger Relay - provides output control in order to energize the defogger relay with a switch ON request.
^
Theft Deterrent Relay - allows the BCM to energize the theft deterrent relay for UTD.
BCM Wake-Up/Sleep State
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
two wake-up states, activated or deactivated. Multiple switch wake-ups are need in order to sense both the insertion and the removal of the ignition key.
This would allow the BCM to enter a sleep state when the key is in the ignition.
The BCM will enter a wake-up state if any of the following wake-up inputs are detected:
^
Any activity on the serial data line
^
Hatch ajar switch
^
Hatch release switch
^
Door ajar switch
^
Key-in-ignition switch
^
Monitored load relay
^
Park/fog/headlights are on
^
The BCM experiences a battery disconnect and reconnect condition.
^
The ignition is turned ON.
The BCM will enter a sleep state when all of the following conditions exist:
^
No activity exists on the serial data line.
^
The ignition switch is OFF.
^
No outputs are commanded.
^
No delay timers are actively counting.
^
No wake-up inputs are present.
If all these conditions are met the BCM will enter a low power or sleep condition. This condition would indicate the BCM, which is the power mode
master of the vehicle, must have sent a message to the other systems on the serial data line to stop broadcasting their state of health message.
Driver In Vehicle Detection
Using the ignition switch/door ajar inputs, the Body Control Module (BCM) can detect whether or not the driver has left the vehicle. If the ignition is
turned to OFF with no door ajar status detected, the BCM assumes that the driver is in the vehicle. As soon as the BCM detects a door ajar, the BCM
will assume the driver has left the vehicle. The BCM uses this information for the RAP functions, then sends the information on the serial data line to the
other systems also responsible for the RAP functions.
General Information
This vehicle is equipped with a computer system capable of performing multiple engine and body control functions. Vehicle components (windows,
locks, mirrors, etc.) are controlled directly by their system module. Each system communicates with other systems on an "interconnecting bus" or serial
data line. These systems are all part of the vehicle's computer system providing two.way communication between various engine and body control
systems.
