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JR
BODY CONTROL MODULE (Continued)
The BCM utilizes integrated circuitry and informa-
tion carried on the Programmable Communications
Interface (PCI) data bus network along with many
hard wired inputs to monitor many sensor and
switch inputs throughout the vehicle. In response to
those inputs, the internal circuitry and programming
of the BCM allow it to control and integrate many
electronic functions and features of the vehicle
through both hard wired outputs and the transmis-
sion of electronic message outputs to other electronic
modules in the vehicle over the PCI data bus.
OPERATION
The Body Control Module (BCM) is designed to
control and integrate many of the electronic features
and functions of the vehicle. The microprocessor-
based BCM hardware and software monitors many
hard wired switch and sensor inputs as well as those
resources it shares with other electronic modules in
the vehicle through its communication over the PCI
data bus network. The internal programming and all
of these inputs allow the BCM microprocessor to
determine the tasks it needs to perform and their
priorities, as well as both the standard and optional
features that it should provide. The BCM program-
ming then performs those tasks and provides those
features through both PCI data bus communication
with other electronic modules and through hard
wired low current outputs to a number of relays.
These relays provide the BCM with the ability to
control numerous high current accessory systems in
the vehicle.
The BCM monitors its own internal circuitry as
well as many of its input and output circuits, and
will store a Diagnostic Trouble Code (DTC) in elec-
tronic memory for any failure it detects. These DTCs
can be retrieved and diagnosed using a DRBIII scan
tool. Refer to the appropriate diagnostic information.
REMOVAL
The Junction Block and Body Control Module
(BCM) are attached to each other. After removal they
can be separated.
(1) Disconnect and isolate the remote battery neg-
ative cable from the terminal on the shock tower.
(2) Open the front driver's door and remove end
cap.
(3) Remove power mirror switch bezel, radio bezel,
and small bezel on the right side of the steering col-
umn.
(4) Remove the left lower instrument panel trim.
(5) Remove silencer.
(6) Remove wire harness connectors from Junction
Block.
(7) Remove Junction Block three mounting screws.
ELECTRONIC CONTROL MODULES
(8) Remove
Junction
straight down from the mounting bayonet.
(9) Disconnect BCM wire connectors and remove
the assembly.
(10) Remove Junction Block/BCM from vehicle.
(11) With the Junction Block/BCM removed from
the vehicle, separate the BCM from the Junction
Block by removing the four screws.
(12) Disconnect BCM from the Junction Block.
(13) Unsnap the remote keyless entry module from
the BCM.
NOTE: The Remote Keyless Entry (RKE) module is
attached to the BCM. This must be transferred (if
equipped) to the new BCM if being replaced.
NOTE: If BCM is replaced, the VTSS must be
enabled in the new BCM via the DRB lll in order to
start the vehicle.
INSTALLATION
NOTE: If BCM is replaced, the VTSS must be
enabled in the new BCM via the DRB lll in order to
start the vehicle.
(1) Snap the remote keyless entry module onto the
BCM.
(2) Connect BCM to the Junction Block.
(3) Connect the BCM and junction block together
with the four screws.
(4) Install the Junction Block/BCM into vehicle.
(5) Connect BCM wire connectors and install the
assembly onto instrument panel.
(6) Install the Junction Block/BCM by pushing
straight up.
(7) Install the Junction Block three mounting
screws.
(8) Install the wire harness connectors to the Junc-
tion Block.
(9) Install the silencer.
(10) Install the left lower instrument panel trim.
(11) Install the power mirror switch bezel, radio
bezel, and small bezel to the right of the steering col-
umn.
(12) Install the left end cover.
(13) Connect the remote battery negative cable to
the remote terminal on the shock tower.
8E - 3
Block/BCM
by
pulling
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