Power Distribution System Description And Operation - Jeep Cherokee 2000 Service Manual

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POWER DISTRIBUTION SYSTEMS
DESCRIPTION AND OPERATION
POWER DISTRIBUTION SYSTEM. . . . . . . . . . . . . 1
POWER DISTRIBUTION CENTER . . . . . . . . . . . . . 2
IGNITION-OFF DRAW FUSE . . . . . . . . . . . . . . . . . 2
JUNCTION BLOCK . . . . . . . . . . . . . . . . . . . . . . . . 3
REMOVAL AND INSTALLATION
POWER DISTRIBUTION CENTER . . . . . . . . . . . . . 4
DESCRIPTION AND OPERATION
POWER DISTRIBUTION SYSTEM
DESCRIPTION
This group covers the various standard and
optional power distribution components used on this
model. The power distribution system for this vehicle
consists of the following components:
• Power Distribution Center (PDC)
• Junction Block (JB).
The power distribution system also incorporates
various types of circuit control and protection fea-
tures, including:
• Automatic resetting circuit breakers
• Blade-type fuses
• Maxi fuse-type fusible links
• Relays.
Following are general descriptions of the major
components in the power distribution system. See the
owner's manual in the vehicle glove box for more
information on the features and use of all of the
power distribution system components. Refer to the
index in this service manual for the location of com-
plete circuit diagrams for the various power distribu-
tion system components.
TABLE OF CONTENTS
page
IGNITION-OFF DRAW FUSE . . . . . . . . . . . . . . . . . 5
JUNCTION BLOCK . . . . . . . . . . . . . . . . . . . . . . . . 6
DISASSEMBLY AND ASSEMBLY
POWER DISTRIBUTION CENTER . . . . . . . . . . . . . 7
SPECIAL TOOLS
POWER DISTRIBUTION SYSTEMS . . . . . . . . . . 10
NOTE: This group covers both Left-Hand Drive
(LHD) and Right-Hand Drive (RHD) versions of this
model. Whenever required and feasible, the RHD
versions of affected vehicle components have been
constructed as mirror-image of the LHD versions.
While most of the illustrations used in this group
represent only the LHD version, the diagnostic and
service procedures outlined can generally be
applied to either version. Exceptions to this rule
have been clearly identified as LHD or RHD, if a
special illustration or procedure is required.
OPERATION
The power distribution system for this vehicle is
designed to provide safe, reliable, and centralized dis-
tribution points for the electrical current required to
operate all of the many standard and optional facto-
ry-installed electrical and electronic powertrain,
chassis, safety, security, comfort and convenience sys-
tems. At the same time, the power distribution sys-
tem was designed to provide ready access to these
electrical distribution points for the vehicle techni-
cian to use when conducting diagnosis and repair of
faulty circuits. The power distribution system can
also prove useful for the sourcing of additional elec-
trical circuits that may be required to provide the
electrical current needed to operate many accessories
that the vehicle owner may choose to have installed
in the aftermarket.
POWER DISTRIBUTION SYSTEMS 8O - 1
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