Cutlass V6-191 3.1L VIN M SFI (1998)
The Body Function Controller (BFC) will determine which indicators to bulb check by looking at an EEPROM table. Every Serial Peripheral Interface
(SPI) indicator has a bit in the EEPROM table. The gauges will WOW during a bulb check. A WOW is when all of the gauge indicators are moved at
the same time. If there is an indicator lit before the WOW, the indicator shall remain lit after this function has concluded.
Check Oil Indicator (L82 Only)
The Check Oil indicator (amber) will be illuminated when the Powertrain Control Module (PCM) reads the Oil Level Switch and transmits a Class 2
message to the Body Function Controller (BFC) indicating there is a Low Oil Level Condition. The Body Function Controller (BFC) will then command
the Check Oil indicator ON over the Serial Peripheral Interface (SPI) interface to the Instrument Cluster. If the Low Oil Level option is false all Class 2
activity on the part of the Body Function Controller (BFC) will stop. The Body Function Controller (BFC) will not send out any request for the Low Oil
Level condition command and will not issue a Low Oil Level condition report. In the event of a loss of Body Function Controller (BFC) or Powertrain
Control Module (PCM) Class 2 serial data the Check Oil indicator will not illuminate unless the indicator was illuminated when the event occurred. In
the event of an Serial Peripheral Interface (SPI) data link failure, the Check Oil indicator will not illuminate unless the indicator was illuminated prior to
the Serial Peripheral Interface (SPI) data link failure.
Chime Request Function
When the Body Function Controller (BFC) requests a driver warning to the Instrument Cluster, it may also produce a chime. The following chimes are
provided:
^
Key In Ignition Headlamps ON
^
Seatbelt Not Fastened
^
Turn Signal On
^
Park Brake Warning
^
Door Ajar Warning
^
Check Gauges
Cruise Indicator
The CRUISE indicator (green) will be illuminated when the Powertrain Control Module (PCM) transmits a Class 2 message to the Body Function
Controller (BFC) indicating the Cruise is engaged. The Body Function Controller (BFC) will then command the CRUISE indicator ON over the Serial
Peripheral Interface (SPI) serial data bus to the Instrument Cluster. In the event of a Class 2 serial data loss the CRUISE indicator will not be
illuminated. In the event of an Serial Peripheral Interface (SPI) data link failure, the CRUISE indicator will not illuminate unless the indicator was
illuminated prior to the Serial Peripheral Interface (SPI) data link failure.
Door Ajar Indicator
This is a distributed function. The Door Ajar indicator (red) will indicate to the driver that one or more of the vehicle doors are open when the Ignition
Switch is turned to the RUN position., This will also cause a chime. The Door Ajar indicator and chime will be turned OFF when all doors are closed.
The Body Function Controller (BFC) will read the status of all door inputs, determine the indicator control and then send the control state to the
Instrument Cluster in a Serial Peripheral Interface (SPI) message. The Instrument Cluster will read the Door Ajar indicator control bit in the Serial
Peripheral Interface (SPI) message and control the indicator directly. In the event of a loss of the Serial Peripheral Interface (SPI) interface with the
Body Function Controller (BFC), the Instrument Cluster will turn the Door Ajar indicator OFF.
Driver Warning System
The Body Function Controller (BFC) is responsible for interpreting all driver warnings sent by control modules on the Class 2 serial data line and
sending that information on to the Instrument Cluster in the form of a Serial Peripheral Interface (SPI) serial data bus message. The list of messages sent
by the Body Function Controller (BFC) to the Instrument Cluster are as follows:
^
Fuel Gauge Position
^
Temperature Gauge Position
^
Oil Pressure
^
Low Engine Coolant
^
Check Oil
^
Volts
^
ABS
^
High Beam
^
Low Fuel
^
High Temperature
^
Washer Fluid Level Low
^
CRUISE
^
BRAKE
^
SERVICE VEHICLE SOON
^
Door Ajar
^
Seat Belt
^
THEFT SYSTEM
^
PRNDL
Engine Coolant Temperature Gauge and High Temperature Indicator
This function controls the Engine Coolant Temperature Gauge and the High Temperature indicator (red). The Powertrain Control Module (PCM) reads
