4.4.5 Battery Disconnect Relay (Split Charge Relay)
Battery Disconnect Relay(Split Charge Relay)
Relay Pin 1 — 12V (KL30)
1
Ignition Switch Supply, Fuse KL30 — Fuse F3
(BCM)
A
Relay Pin 2 — Ground Switched (to close
relay)
2
Battery Disconnect Relay
B
Relay Pin 3 — Ground Switched (to open
relay)
3
Ignition Switch Supply, Fuse KL30, Fuse F2 (PFB)
C
Relay Pin 4 — 12V (KL30)
4
Vehicle Start Battery
D
BCM Output — Pin C3-13
5
Auxiliary Battery
E
BCM Output — Pin C3-30
6
Pre Fuse Box
F
BCM Output — Pin C4-65
7
Body Control Module (BCM)
G
Battery Disconnect Relay (Split Charge
Relay)
Where a vehicle is equipped with a single battery,
the system can be updated to a twin system. This
requires updating to a split charge relay, instead
of the shorting bar. This ensures that auxiliary
circuits are isolated from the vehicle start battery
at key off, ensuring the engine can be cranked.
The battery disconnect relay is controlled from
the BCM using a pulsed change of state strategy
(coil not continuously energized) and is always
factory fit for twin systems. Reconfiguration of
the BCM software by the Ford dealership is
required to support this feature. It will also be
required to update the system to include a second
BMS and wiring, also requiring dealership battery
type reconfiguration. If the second battery is not
configured, it will be treated as a load. Alternative
connectivity can be done as shown in the
schematic in this section. An update list of parts
is shown at the end of this section.
Refer to: 4.3 Charging System (page 74).
SRC
Refer to: 4.8 Electronic Engine Controls (page 97).
Start-Stop.
Date of Publication: 04/2012
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