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
FordTransit 2006.5 (April 2006–)
Date of Publication: 12/2006
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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.
FordTransit 2006.5 (April 2006–)
Date of Publication: 12/2006
4 Electrical
137E8472241572634617325517113128131441516
Connector C2
DescriptionItem
Reverse SignalPin
15
Third Brake/Stop Light
A signal for a third brake / stop light is also
available on the tail light connector (see Reverse
Signal). It can be used directly to feed an LED
stop light, or a conventional stop light with a bulb
(maximum 21W)*
In order to avoid electrical issues due to leakage,
and to ensure connector compatibility, a mating
connector with seals/plugs and pre-crimped wire
& terminal should be used.
For connectivity, see following Figure E84725,
also the details given in the section for Reverse
Signal and in Adding Connectors, Terminals and
Wiring.
Pin for the Third Brake/Stop Light
DescriptionItem
Brake /Stop Light SignalPin 2
The use of the trailer tow connector is not
recommended. IF it must be used, please see
the following figure E4726.
FordTransit 2006.5 (April 2006–)
Date of Publication: 12/2006
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14915E84724 2E84725
Pin Brake Light on Trailer Tow in-line connector at Rear of Vehicle
DescriptionItem
Third Stop LightPin 8
*If an existing third brake/stop lamp is already
fitted, or if the power exceeds 21W, an
intermediate relay must be used.
For Van, Bus and Kombi, the signal should be
derived from the 6-way connector to the rear
light assembly, pin 4.
Additional Position Lights at the Rear
of the Vehicle
The feed for position lights only at the rear
(bottom / top) can be taken from the licence plate
lighting connectors: left and right. For the correct
pin, please refer to Figure E84727; the maximum
load is 10W per side.
NOTE: Any additional position lights should be
taken from the licence plate lights, and no other
source.
In order to avoid electrical issues due to leakage,
and to ensure connector compatibility, a mating
connector with seals/plugs and pre-crimped wire
& terminal should be used. See Adding
Connectors,Terminals and Wiring.
NOTE: Position lamps (front and rear) only
function with the lighting switch in positions 1 or
2; however, the same bulbs are also used for the
parking lamps. There are two operating modes
for the latter, both with the ignition key removed.
1.Ignition off, master light switch to position ‘P’:
all 4 lamps are on.
2.Ignition off, master light switch off, move turn
indicator stalk to either left or right position (and
leave in): tell-tale and chime will operate briefly
and parking lamps (2) on the side selected will
be on.
The position and parking functions operate
independently.
When the position lights are extinguished, the
side marker and end-outline markers turn off
simultaneously, in line with InterRegs No 48, which
states the following:
5.11 - The electrical connections must be such
that the front and rear position lamps, the
end-outline marker lamps, if they exist, the
side-marker lamps, if they exist, and the rear
registration plate lamp can only be switched on
and off simultaneously. This condition does not
apply when using front and rear position lamps,
as well as side-marker lamps when combined or
reciprocally incorporated with said lamps, as
parking lamps and when side-marker lamps are
permitted to flash.
FordTransit 2006.5 (April 2006–)
Date of Publication: 12/2006
4 Electrical
1508E84726
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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Date of Publication: 12/2006
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