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GENERAL INFORMATION
3.4 BODY CONTROL MODULE (BCM)
CAUTION: Notice To Service Technicians,
Dealership Personnel, and Plant Personnel,
Engineering
Does
Swapping BCMs Between Vehicles Or With
BCMs Off The Shelf.
The Body Control Module (BCM) is operational
when supplied with battery power. The BCM con-
trols various vehicle functions. It also supplies
information to the instrument cluster to provide
visual and audible information to the vehicle occu-
pants. To provide and receive information, the
module interfaces with the vehicle's serial bus
communications network (PCI). This network con-
sists of the:
•
Integrated Power Module (IPM), which incorpo-
rates the Power Distribution Center (PDC) and
the Front Control Module (FCM) into one assem-
bly
•
Next Generation Controller (NGC), which incor-
porates the Powertrain Control Module (PCM)
and the Transmission Control Module (TCM)
into one module
•
Mechanical Instrument Cluster (MIC)
•
Electronic Vehicle Information Center (EVIC)
•
Occupant Restraint Controller (ORC)
•
Compass/Mini-Trip (CMTC)
•
Overhead Console
•
Controller Antilock Brake (CAB)
•
Automatic Temperature Control Module (ATC)
•
Power Liftgate Module (PLGM)
•
Audio system-including the Amplifier, CD/DVD
changer, and the SDAR system
•
Memory Heated Seat Adjustable Pedal Module
(MHSAPM)
•
Memory
Seat
Adjustable
(MSAPM)
•
Navigation Module
•
Hands Free Module
•
Sentry Key Remote Entry Module (SKREEM)
•
Driver Door Module (DDM) and the Passenger
Door Module (PDM)
The BCM:
•
Provides a battery protection feature.
The BCM will send a message to the IPM to
turn off all exterior lamps after 3 minutes
and all interior lamps after 15 minutes after
the ignition is turned off, if they are not
turned off by the driver.
•
Provides Compass/Minitrip support.
Not
Recommend
Pedal
Module
•
Provides
interior
lamps).
•
Provides diagnostic reporting.
•
Provides electronic liftgate release (with power
door locks).
•
Provides exterior lighting.
•
Provides headlamp time delay (with/without
auto headlamps).
•
Provides automatic headlamps (with electro-
chromatic mirror).
•
Provides illuminated entry.
•
Provides a fade to off feature.
This feature dims the interior lighting (cour-
tesy lamps) gradually if the BCM does not
receive any new input that would cause the
interior lamps to remain on.
•
Provides PWM instrument panel dimming.
•
Provides power liftgate switch input.
The BCM has 1 Liftgate switch input located
in the overhead console.
•
Provides all stalk switch inputs including wipers
and light switches.
•
Provides seatbelt position input, indicating a
buckled or unbuckled seatbelt.
•
Provides turn signal operation.
•
Provides fuel Level inputs.
•
Monitors rear-door ajar switches, liftgate ajar
switches, multifunction switches, multifunction
headlight switch, ignition switch, PCI Bus, and
diagnostic tool. Based on input from these com-
ponents, the BCM will send requests over the
PCI Bus to have the Instrument Cluster perform
various chime operations.
The BCM has internal diagnostic capabilities
that assist in diagnosing the vehicle's body system.
When an ''Open'' or a ''Short'' circuit exists, the
diagnostic tool can read the stored BCM Diagnostic
Trouble Codes (DTCs). The DTCs are very descrip-
tive in identifying the appropriate feature that has
faulted.
3.5 CHIME WARNING SYSTEM
The cluster monitors the PCI Bus for requests
from various modules to display messages and
under certain conditions sound a chime or series of
chimes.
The chime system provides the Driver with
warning chimes for the:
•
seat belt
•
exterior lights on
•
key-in ignition
10
lighting
(courtesy/reading
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