L322 Range Rover System Description and Operation
SECURITY
86-5-20 DESCRIPTION AND OPERATION
Operation
Locking System
The locking system allows the doors and fuel filler flap to be centrally locked and unlocked using the CDL switch, the
drivers door lock and the remote handset. The system has two locking states: locked and superlocked. Locking the
vehicle from inside using the CDL switch puts the system into the locked state. Locking the vehicle from the outside
using the driver's door lock or the remote handset puts the vehicle into the superlocked state.
When the vehicle is locked, the BCU:
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Energises the lock actuators in the side door latches to disengage the external door handles from the latches
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Energises the fuel filler flap actuator to extend the locking pin to secure the filler flap (all except NAS)
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Ignores inputs from upper tail door external release switch.
The BCU will lock the vehicle regardless of the position of the ignition switch and whether the key is in the ignition
switch or not. The upper tail door internal release switch remains enabled and individual side doors can be unlocked
using the internal door handle. From the locked state, the vehicle can be centrally unlocked using the CDL switch, the
remote handset or the driver's door lock.
When the vehicle is superlocked, the BCU:
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Energises the lock and the superlock actuators in the side door latches to disengage both the internal and the
external door handles from the latches
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Energises the fuel filler flap actuator to extend the locking pin to secure the filler flap
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Ignores inputs from both the external and the internal release switches of the upper tail door
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Ignores inputs from the CDL switch.
The BCU will only superlock the vehicle after the ignition key has been removed from the ignition switch and the
driver's door has opened. From the superlocked state, the vehicle can be centrally unlocked using the remote handset
or the driver's door lock.
Tail Door Opening
When the vehicle is locked or superlocked, operating the tail door release button on the remote handset causes the
BCU to actuate the upper tail door release actuator while leaving the remainder of the system in the locked/
superlocked condition.
Volumetric protection is disabled when the taildoor is opened.
SPE
With the vehicle superlocked and SPE enabled, when the BCU receives a request from the remote handset or the
driver's door lock it unlocks the driver's door and changes the rest of the system from the superlocked to the locked
state. When it receives a second unlock request, from the remote handset, the driver's door lock or the CDL switch,
the BCU unlocks the remainder of the system.
Automatic Locking
The BCU can be configured to automatically lock the system when the vehicle exceeds a set speed. The set speed
is selectable between 2.5 and 17.5 mph (4 and 28 km/h) in 2.5 mph (4 km/h) increments.
To guard against accidental unlocking, the BCU can also be configured to automatically lock (not superlock) the
system if no door switch, bonnet switch or CDL switch is activated within 2 minutes of unlocking the vehicle with the
remote handset.
Automatic Unlocking
If a crash that triggers the airbags occurs, the SRS DCU outputs a crash signal to the BCU. On receipt of the crash
signal the BCU outputs unlock signals to all the door latch actuators and the fuel filler flap actuator, irrespective of
their current locked state. Subsequent attempts to lock the doors are inhibited until the BCU has received an unlock
request.
