Chrysler Concorde 2004 Service Manual page 35

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No start (if equipped with Sentry Key Immobi-
lizer)
Symptoms of Individual module failure could
include any one or more of the above. The difference
would be that at least one or more modules would
respond to the DRBIII .
Diagnosis starts with symptom identification. If a
complete PCI Bus Communication Failure is sus-
pected, begin by identifying which modules the
vehicle is equipped with and then attempt to get a
response from the modules with the DRBIII . If any
modules are responding, the failure is not related to
the total bus, but can be caused by one or more
modules PCI circuit or power supply and ground
circuits. The DRBIII may display ''BUS +/- SIG-
NALS OPEN'' OR ''NO RESPONSE'' to indicate a
communication problem. These same messages will
be displayed if the vehicle is not equipped with that
particular module. The CCD error message is a
default used by the DRBIII and in no way indi-
cates whether or not the PCI bus is operational. The
message is only an indication that a module is
either not responding or the vehicle is not equipped.
NOTE: Communication over the bus is essential
to the proper operation of the vehicles on-board
diagnostic systems and the DRBIII . Problems with
the operation of the bus or DRBIII must be cor-
rected before proceeding with diagnostic testing. If
there is a problem, refer to the Communications
category of this manual.
GENERAL INFORMATION
19