The Central Junction Box (CJB) is the prime
control module in the vehicle’s electrical
architecture. It is responsible for management of
most of the vehicle’s lighting, locking and security
systems. The following chart details the
consequences of overloading of the Central
Junction Box.
Maximum Loads on Central Junction Box
Overload ConditionMaximum
Load
Load TypeComponentFunction
Output driver damage5A/100msecRelayLow Side DriverBattery Discon-
nect Switch
Overheat - output shutdown75W@13VBulbLow Side DriverEntry Illumina-
tion
Overheat - output shutdown8A normal, 16A/
10msec in-rush
Electro-mechan-
ical horn
High Side DriverAlarm Siren
Output shutdown if more
than 35mA drawn
25mALogic supplyVoltage trackerAccelerator
Pedal
Blown fuse - if bigger fuse
fitted, relay and/or printed
circuit board damaged
100W@13VBulbRelayBattery Saver
Supply
Blown fuse - if bigger fuse
fitted, relay and/or printed
circuit board damaged
60W@13VBulbRelayLicence Plate
Overheat-output shutdown11W@13VBulbHigh Side DriverCluster Dimming
Blown fuse - if bigger fuse
fitted, relay and/or printed
circuit board damaged
63W@13VBulbRelayPosition Lamp
Left Hand
Blown fuse - if bigger fuse
fitted, relay and/or printed
circuit board damaged
43W@13VBulbRelayPosition Lamp
Right Hand
Overheat-output shutdown3x21W@13VBulbTurn Indicator
Left Hand
Overheat-output shutdown3x21W@13VBulbTurn Indicator
Right Hand
Blown fuse - if bigger fuse
fitted, relay and/or printed
circuit board damaged
15A (fuse
limited)
LatchRelayLock/double
lock
Relay and/or printed circuit
board damaged
5,42A@13V,
2,5mh
LatchUnlock Relay
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Battery Disconnect Switch
Battery Disconnect Switch Relay Parameters
260 ampsNormally open contacts
3.3 A @ 25°CNominal coil current
High Power Bistable relay - Part number: 6C1T-10B728-A_
In addition to the fuses and relays fitted to the
Pre Fuse Box (PFB), Engine Junction Box (EJB)
and Central Junction Box (CJB), depending on
vehicle options, there may be up to 3 relays
mounted directly to the Heating, Ventilation and
Air-conditioning (HVAC) unit. These relays should
not be tampered with as they affect operation
of the associated system.
Heating, Ventilation and Air-conditioning (HVAC)
1 x 82GG-13A025-CAAir-conditioning
2 x 82GG-13A025-CAFuel-fired Heater without Air-conditioning
3 x 82GG-13A025-CAFuel-fired Heater with Air-conditioning*
*In addition to the relays, there is a diode 91AG-10374-B_
These relays have a different terminal
arrangement to those fitted throughout the rest
of the vehicle – if they need to be replaced, only
components with the same Ford part number
should be used.
Switches and their Illumination
The main instrument panel switches work in
conjunction with the Central Junction Box, and
are momentary action (non-latching) types. The
Central Junction Box is responsible for control
operation of the respective systems.
For any additional functions, unless the
interfacing module accommodates momentary
action switches, it is recommended that latching
types are used.
Three switches are available:
DescriptionFord Part Number
Rotary light (beacon)6C1V-13D768-A_
Rear work lamp6C1V-13D756-A_
Water faucet (heater)6C1V-19H218-A_
Search illumination for added switches can be
taken from any of the existing switches, by
connecting to the appropriate feed wire.
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Where wires are required to be extended, break
in points should only be at existing connector
points and only Ford approved connectors should
be used.
Ford approved link harnesses should be used.
Unused Connectors
The harnesses may have a number of unused
connectors – these are dedicated to other
features and options, e.g. heated seats, but are
not always present depending on level of
harness fitted. Ford do not recommend the use
of these connectors for any other purpose than
that intended by design.
Power Outlet / Cigar Lighter
Both features adopt a 20A fusing strategy. With
a single battery system, continued loading of
these features will lead to battery drain, and risk
vehicle starting. If continuous power is required,
a second battery option should be installed and
the customer connection points, where fitted,
utilized.
4.14.4 Installation and Routing Guides
Anti-Lock Brake System Wiring Harness Routing
The installation and routing of Ford wiring
(including those provided as part of accessory
kits such as trailer tow) have been fully-validated
and have passed the requisite EMC tests. Ford
Motor Company; however, are not responsible
for the vehicle’s EMC immunity when
non-Ford-approved systems are installed.
WARNING: Do not route other wiring
near/close to electrical cables with
the Antilock Brake System and
Traction Control System cables
because of extraneous signal risk.
It is generally not recommended to
hang it off existing looms or pipes.
Wiring must be suitably fixed without any
detrimental effect on other wiring.
Single or bunched looms must maintain the
following clearances:
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Trailer Tow Connectivity - Trailer Tow, 12N & 12S Sockets
DescriptionItem
13N490 HarnessA
TubesX
PinsY
The Ford trailer tow system is designed to
support one primary set of direction indicators
installed on to the trailer (left hand side and right
hand side). If additional direction indicators are
required, for example for tall horse boxes, these
should be driven using separate relays with the
coils being energized via the respective primary
direction indicator feeds, and power to the bulbs
being derived from the KL30 (B+) line.
WARNING: Depending on the
vehicle's lighting configuration, the
Central Junction Box (CJB) will not
support trailer direction indicators
wired directly to the vehicle's
direction indicators. If this is
attempted, the relevant CJB circuits
may shut down or perform illegally.
The Central Junction Box (CJB) does not
support the incremental load of powering side
marker lamps on a trailer, if these are required
they should also be driven using separate relays,
as above.
NOTE: The trailer detect circuit is part of the
Ford Trailer Tow module – it is not implement
able separately – and is only operational on
vehicles fitted with power locking.
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4.14.6 Ground Points
Van, Bus, Kombi Ground Points
CAUTIONS:
Only use the ground points indicated.
Using alternative points may affect
the vehicle integrity.
Make sure that all ground points are
tightened to the correct torque.
Ground wires should be brought back to the Ford
ground points provided, please refer to the
following figures. For very high current users, it is
recommended that the ground connection is
made directly to the ground point close to the
battery ground point.
Abbreviations used in tables
•LHS - Left Hand Side
•RHS - Right Hand Side
•ABS - Anti-Lock Brake System, TCS - Traction
Control System, IVD- Interactive Vehicle
Dynamics System (ESP - Electronic Stability
Program)
•Misc - Miscellaneous
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Ground Points Table - Van, Bus, Kombi
HarnessTypeTorqueFord Part
Number
Fixing
Type
LocationGround
Point
(GP)
14401Misc. Power
Electric
12NM +/-
1.8
W705661 S437MScrew
M6
Engine Bay LHSGP29
14401Misc. Power
Electric
12NM +/-
1.8
W705661 S437MScrew
M6
Engine Bay RHSGP31
14401Misc. Power
Electric
12NM +/-
1.8
W705661 S437MScrew
M6
A-Pillar LHSGP33
14401Misc. Power
Electric
12NM +/-
1.8
W705661 S437MScrew
M6
A-Pillar RHSGP38
14405Misc. Power
Electric
12NM +/-
1.8
W705661 S437MScrew
M6
D-Pillar LHSGP49
14A005Misc. Power
Electric
12NM +/-
1.8
W705661 S437MScrew
M6
D-Pillar RHSGP51
14301Battery Clamp55NM +/-
8.3
W706542 S409MScrew
M10
Under Driver SeatGP8
14401Airbag12NM +/-
1.8
W705661 S437MScrew
M6
Cab Dash-panel
RHS
GP12*
14401Misc. Power
Electric
12NM +/-
1.8
W705661 S437MScrew
M6
Cab Dash-panel
RHS
GP13
14K024Radio7NM +/-
2.0
W520201 S437Nut M6Cross Car Beam
LHS
GP14
14K024Misc. Power
Electric
7NM +/-
2.0
W520201 S437Nut M6Cross Car Beam
RHS
GP15
14K024Misc. Power
Electric
7NM +/-
2.0
W520201 S437Nut M6Cross Car Beam
LHS
GP16
14303Engine Ground40NM +/-
6.0
W704960 S415Screw
M10
Engine Bay LHSGP19
9K499ABS/TCS/IVD
(ESP)
12NM +/-
1.8
W705661 S437MScrew
M6
GP20*
9K499Power Control
Module
12NM +/-
1.8
W705661 S437MScrew
M6
GP21
9K499Misc. Power
Electric
12NM +/-
1.8
W705661 S437MScrew
M6
GP22
NOTE: Maximum number of eyelets per ground
is 2, except those marked with an *: the
Restraint Control Module (Airbag) and Anti-lock
Brake System (ABS) which have dedicated
grounds.
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Ground Points Table - Chassis Cab
HarnessTypeTorqueFord Part
Number
Fixing
Type
LocationGround
Point
(GP)
14401Misc. Power
Electric
12NM +/-
1.8
W705661 S437MScrew
M6
Engine Bay LHSGP29
14401Misc. Power
Electric
12NM +/-
1.8
W705661 S437MScrew
M6
Engine Bay RHSGP31
14401Misc. Power
Electric
12NM +/-
1.8
W705661 S437MScrew
M6
A-Pillar LHSGP33
14401Misc. Power
Electric
12NM +/-
1.8
W705661 S437MScrew
M6
A-Pillar RHSGP38
14301Battery Clamp55NM +/-
8.3
W706542 S409MScrew
M10
Under Driver
Seat
GP8
14401Airbag12NM +/-
1.8
W705661 S437MScrew
M6
Cab Dash-panel
RHS
GP12*
14401Misc. Power
Electric
12NM +/-
1.8
W705661 S437MScrew
M6
Cab Dash-panel
RHS
GP13
14K024Radio7NM +/-
2.0
W520201 S437Nut M6Cross Car Beam
LHS
GP14
14K024Misc. Power
Electric
7NM +/-
2.0
W520201 S437Nut M6Cross Car Beam
RHS
GP15
14K024Misc. Power
Electric
7NM +/-
2.0
W520201 S437Nut M6Cross Car Beam
LHS
GP16
14303Engine Ground40NM +/-
6.0
W704960 S415Screw
M10
Engine Bay LHSGP19
9K499ABS/TCS/IVD
(ESP)
12NM +/-
1.8
W705661 S437MScrew
M6
GP20*
9K499Power Control
Module
12NM +/-
1.8
W705661 S437MScrew
M6
GP21
9K499Misc. Power
Electric
12NM +/-
1.8
W705661 S437MScrew
M6
GP22
NOTE: Maximum number of eyelets per ground
is 2, exceptthose marked with an *: the
Restraint Control Module (Airbag) and Anti-lock
Brake System (ABS) which have dedicated
grounds.
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harness that provides roof-mounted rear turn
indicators, powered via relays. This should be
used in conjunction with SVO fusebox.
3.Chassis cab LED rear lamp cluster
replacement recommendations, especially
turn indicator relay implications – see lighting
load table. Generally the use of LED equivalent
lighting systems reduces the electrical load on
the vehicle; however, special care needs to
be taken with respect to any change to or
addition of turn indicator lights. Depending on
the current requirements of the LED(s)
compared to the bulb it is replacing, a ballast
resistor may be required, if not already
integrated into the LED lamp assembly.
Without this, bulb outage detection for turn
indicators will be affected, which is a legal
requirement.
Additional turn indicators must be powered
through relays (max 300mA), driven by existing
turn lights. The maximum load that the Central
Junction Box can drive is 3 x 21W per side (front,
rear and CAT 6 turn indicators); but even if the
vehicle is not fitted with the CAT 6 lights, the feeds
for these should not be used as the Central
Junction Box would need reconfiguring, which
could have safety as well as functional
implications.
4.Special Vehicle Option beacon switch: wiring
locations, circuit diagrams and max amperage
– see Special Vehicle Option fuse box
schematic (max current is 15A); there is
provision for the Special Vehicle Option beacon
switch in an empty switch location on the
instrument panel.
5.Rear loom connector detail location and supply
details for retro-fit loom extension for
example:- when extending a medium wheel
base, long wheel base or extended frame
overhang, what connectors do they use to
make a plug and play loom extension? – for
chassis cab vehicles, there is an Special
Vehicle Option extension loom for rear lamps
(part number 6C1V-14408-A*). There is not, at
present, a similar loom for Van, Bus and
Kombi's, although the appropriate mating
connector is now tooled, so this would be
possible.
Miscellaneous Systems
Handbrake on - Cluster Warning Light -
Unless the vehicle is specified with options that
drive the handbrake warning light (for example
ESP, Australia market), the components making
up this system are not fitted. We do not
recommend installation of this feature as an
aftermarket addition. There are several reasons
for this:
1.Not all circuits carry the requisite wire as a give
away:
•The wires might be part of the main vehicle
harness (14401) even if not used – for example
camper vehicles are normally ordered with
power mirrors, and the wires will be present
as a give-away.
•The seat pedestal harness (14K076), however,
is vehicle specific – if the handbrake is not part
of the specification, it will not be present or
give-away. This harness would need to be
changed to the compatible part that also
includes the handbrake warning light circuit.
2.The handbrake switch (part number
2F2T-15852-A*) together with its short jumper
harness (6C1T-15K857-A*) would need to be
obtained and fitted.
3.The handbrake warning light is in all clusters,
but unless the vehicle config. parameter
“parking brake switch” is set, the Central
Junction Box will not read this input, and hence
NO CAN message sent to the cluster.
Reconfiguration can only be done at a Ford
Dealer.
NOTE: If a vehicle already has a handbrake
warning light in the cluster, or one is installed as
per the Ford design, it is not possible to utilize the
wire from the handbrake switch as part of an
interlock circuit (this is a pull up resistor input that
provides a wetting current of 20mA – anything in
excess of this, for example through additional
circuitry, will almost certainly damage the Central
Junction Box). If there is no handbrake switch
installed, it would be possible to add one and
utilize this as part of a separate circuit, up to a
maximum current of 500mA through the switch.
Reverse Sensors (Rear Park Aid
Module)- The factory-fit option is a CAN-based
system, but for Van, Bus, and Kombi vehicles
only. Stand-alone systems can be installed (for
example for chassis cab conversions), but would
need to utilize the PTA line of the radio if muting
is required.
Fuel Fired Heater (FFH)- Add FFH: wiring is
only present (give-away) in certain harnesses.
There was an aftermarket kit available for this
system on current Transit, which could probably
be “updated” to suit V347/8.
Fuel Fired Heater (FFH) - Programmable
FFH: this utilizes a timer/control module mounted
to the Instrument Panel, which necessitates
having the correct Instrument Panel harness
fitted. Retrofit of this would be a difficult.
For both systems, the appropriate 6C1T-14K132
harness would be required (suffix -A* for
Programmable FFH, and suffix –B* for Add FFH).
Central Locking
Locking is controlled by the Central Junction Box
module. There is current sensing on certain
locking circuit pins as part of the security system
– if these are tampered with, locking cannot be
guaranteed.
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