DESCRIPTION AND OPERATION
RANGE ROVER 4.1
DESCRIPTION AND OPERATION
ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL)
DESCRIPTION
Anti-Theft Alarm
The anti-theft alarm system fitted to New Range Rover consists three main areas:
l Perimetric protection.
l Volumetric protection.
l Vehicle angle monitoring.
Perimetric Protection
The Body Control Unit (BCU) protects the outside of the vehicle by monitoring the condition
of all four door switches, the bonnet switch, and the upper tail door switch and sounds the
alarm if any are triggered.
Volumetric Protection
The BCU protects the inside of the vehicle via an volumetric sensor mounted in the centre
of the headlining. If the volumetric sensor detects movement within the passenger
compartment, it informs the BCU to sound the alarm. When the alarm is first armed, the BCU
allows 15 seconds for the air within the passenger compartment to stabilise. The alarm will
then become fully armed after a further 15 seconds.
Vehicle Angle Monitoring
The BCU protects against the vehicle being illegally towed away, or any of the wheels being
stolen by measuring the longitudinal and transverse angle of the vehicle. The angle of the
vehicle is monitored by the tilt sensor, which is located beneath the front passenger seat.
When the vehicle is first armed, the tilt sensor stores the angle of the vehicle it its memory.
If the angle changes more than 1.2° (longitudinal) or 1.4° (transverse), the tilt sensor informs
the BCU to sound the alarm. After the alarm has been triggered once, the threshold is
lowered to 1.1 ° and 1.3 ° to make the alarm even more sensitive to vehicle angle movement.
NOTE: If the upper tail door is unlocked using the RF transmitter, the tail door switch,
volumetric sensor, and tilt sensor will be disabled. These will be reactivated 30 seconds after
the tail door is closed and locked.
An anti-theft alarm LED is mounted in the rear view mirror to act as a visual deterrent. The
flashing sequence of the LED is dependent upon the status of the anti-theft alarm system.
For detailed information on the anti-theft alarm system, refer to the Anti-theft Alarm and
Central Door Locking section of the Description and Operation Workshop Manual.
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