DESCRIPTION AND OPERATION
RANGE ROVER 4.5
Battery Backed-Up Sounder (BBUS)
The BBUS (C0666) is mounted adjacent the brake servo, and is provided a constant battery
feed by fuse 43 of the passenger compartment fuse box (C0586) on an RN wire. Dependant
upon market configuration, the BBUS can emit one of three tones:
l Continuous.
l Pulsed.
l Modulated.
When the anti-theft alarm is armed, the BCU (C0661) 'switches on' the BBUS by providing
a pulsed voltage signal to the tilt sensor (C0960) on a BS wire. This signal is relayed to the
BBUS (C0666) on a BG wire.
When the alarm is triggered, the BBUS (C0662) provides a feed to the BBUS (C0666) on a
BU wire. The BBUS (C0666) is earthed on an N wire.
Perimetric Protection
The BCU (C0660) is located beneath the front passenger seat, and is provided a constant
battery feed from fuse 15 of the passenger compartment fuse box (C0586) on an RS wire.
The door, bonnet, and tail door switches are all normally open switches. When any of these
panels are opened, the switch contacts close and an earth path is created. The BCU
(C0660) monitors the condition of door bonnet and tail door switches as follows:
l The BCU monitors the condition of the drivers door switch (C1449) via the drivers door
module (C2058) on a UR then NW wire. The drivers door switch (C1449) is earthed on
an N wire.
l The BCU monitors the condition of the front passenger door switch (C1451) via the
passenger door module (C2057) on a UR then NW wire. The passenger door switch
(C1451) is earthed on an N wire.
l The BCU monitors the condition of the LH rear passenger door (C0442) on an NS then
NG wire. The LH rear passenger door switch (C0442) is earthed on an N wire.
l The BCU monitors the condition of the RH rear passenger door (C0442) on an NW
then NG wire. The RH rear passenger door switch (C0442) is earthed on an N wire.
l The BCU monitors the condition of the bonnet switch (C0007) on a PG wire. The
bonnet switch (C0007) is earthed on an N wire.
l The BCU monitors the condition of the upper tail door switch (C0383) on an SW wire.
The upper tail door switch (C0383) is earthed on an N wire.
NOTE: The LH rear and RH rear passenger door switches have the same connector number
as they utilise the same harness.
Anti-theft Alarm LED
The anti-theft alarm LED is located in the rear view mirror. The flashing sequence of the LED
(C0698) is controlled by the BCU (C0661) on an SBY wire.
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