Range Rover 2. Electrical Manual - part 75

SECURITY/CENTRAL LOCKING

CIRCUIT OPERATION

Audible/Visual Warnings

When an intrusion is detected, the Alarm Sounder
(Z171) will sound and visual indicators will flash. The
output from the sounder is either pulsed or a
continuous tone, depending on market legislation. If
the output is pulsed, then its status will be
synchronised with that of the visual indicators.

The lamps used for external visual indication are
dependent upon market legislation, but will be either
Hazards, or Side and Tail, or Dip and Tail.

Two different types of Alarm Sounders are available:

1. Normal Alarm Klaxon (Alarm Sounder (Z171))

2. Battery Backed Up Alarm Sounder (Z272)

The Battery Backed Up Alarm Sounder (Z272) is an
alarm sounder which contains its own internal
battery. When the ignition is on, the internal battery
is charged via an ignition feed. If either the connector
is removed or the wires to it are cut, then the
sounder will sound for 4.5 minutes.

To disconnect the Battery Backed Up Alarm Sounder
(Z272):

Turn Ignition On (Pos. II).

Turn Ignition Off.

Disconnect within 17 seconds.

To silence if triggered:

Connect.

Disarm Alarm.

Turn Ignition On (Pos. II).

Alarm Triggering

The perimetric alarm will be triggered by any of the
doors opening, the tailgate opening, the bonnet
opening, the ignition key being inserted, the ignition
being turned on, or the inertia switch being tripped.

The volumetric alarm will be triggered by any
movement within the passenger compartment.

The alarm will be triggered a maximum of three
times during any set/unset period. Any further
triggers after this will be ignored.

ENGINE IMMOBILISATION FUNCTION

The engine will be immobilised whenever the alarm
is armed or the alarm enters the Passive
Immobilisation mode (regardless of whether or not
the theft alarm is armed). There are two methods of
Engine Immobilisation featured:

1. Engine Crank Disable

2. Electronic Engine Immobilisation

The electronic engine immobilisation is controlled
jointly by the engine management system’s
Electronic Control Module and the BeCM.

If a crank signal is detected when the engine is
immobilised, the “Engine Immobilised” message will
be transmitted to the instrument pack, and it will not
be possible to start the engine.

Engine Immobilisation (Petrol)

The BeCM mobilises the engine by transmitting an
engine mobilise code to the ECM. The code is not
sent when the engine is immobilised.

Engine Immobilisation (Diesel)

The electronic engine immobilisation feature fitted to
the diesel engine derivatives is different to the
system fitted to the petrol versions.

The BeCM mobilises the engine by holding the
engine mobilise output high. The output will be low
when the engine is immobilised.

SECURITY/CENTRAL LOCKING

CIRCUIT OPERATION

Passive Immobilisation

The following conditions will passively immobilise the
vehicle:

30 seconds after ignition has been turned off and
the driver’s door has been opened.

30 seconds after ignition has been turned off, the
key removed, and the driver’s door has been
opened.

10 minutes after ignition has been turned off and
the key removed (without opening the driver’s
door).

The handset becomes desynchronised (or with
an improperly functioning handset).

The vehicle can be mobilised by any of the following
methods:

Turn the ignition on (The handset must be func-
tioning properly and within close proximity to the
key!)

Press unlock button on the handset

Enter EKA code

NOTE: The vehicle will remain immobilised by
attempting to turn the ignition on with the handset
detached from the key ring (or with an improperly
functioning handset).

If the handset becomes desynchronised (or is
functioning improperly), the engine will be passively
immobilised. If an attempt is made to start the
engine, the message “Engine Disabled, Press
Remote” will be displayed on the message centre. To
mobilise the engine the EKA code must be entered
and the handset (when functioning properly)
resynchronised.

Passive Immobilisation Coil (Z270)

A magnetic field is generated by the passive
Immobilisation Coil (Z270) contained in the steering
column. This field excites a receiving coil in the
handset causing it to transmit a mobilisation signal to
the BeCM. If the BeCM does not receive this signal
from the handset, the vehicle will remain
immobilised.

Handset Transmitter Resynchronisation

The Theft Alarm Unit (Z163) will remain
synchronised with the handset unless:

The handset’s batteries have been removed.

The vehicle’s battery has been disconnected.

NOTE: All handsets must be resynchronised when
the vehicle’s battery has been disconnected.

A handset may be resynchronised by performing a
key lock, or unlock, on either front door within 30
seconds of performing a remote lock, superlock, or
unlock function. The BeCM uses the change of state
of the CDL Switch to initiate resynchronisation.

Emergency Key Access (EKA)

EKA is used to disarm the theft alarm and mobilise
the vehicle in the event of a handset failure. This is
possible through a series of locks and unlocks with
the key in the driver’s door lock cylinder. With the
vehicle locked and the alarm armed, turn the key the
required number of times according to the following
sequence:

1. To enter the first digit, turn the key the required

number of times to the unlock position.

2. To enter the second digit, turn the key the re-

quired number of times to the lock position.

3. To enter the third digit, turn the key the required

number of times to the unlock position.

4. To enter the fourth digit, turn the key the required

number of times to the lock position.

5. Turn the key to the unlock position to unlock the

doors, disarm the alarm, and mobilise the ve-
hicle.

NOTE: The key must be fully turned to the rest and
lock/unlock position each time.

After 5 wrong attempts, you must wait 10 minutes.

SECURITY/CENTRAL LOCKING

CIRCUIT DIAGRAM

F 15

20 A

C325

S302

Z238
Body Electrical
Control Module
(BECM)

See Fuse Details

C326

X229
Key–In Switch

[1]

Key Inserted

C255

[1]

Z270
Passive Immo-
bilisation Coil

C233

S215

See Ground Dis-
tribution

E252

Z250
Alarm R.F. Aerial
Module

C313

E322

S301

See Ground Dis-
tribution

Antenna

SECURITY/CENTRAL LOCKING

CIRCUIT DIAGRAM

X125
Fuel Flap Release
Switch

S207

C225

See Ground Dis-
tribution

E322

E252

See Ground Dis-
tribution

C225

S301

C314

M108
Fuel Flap Actua-
tor

LGS

E621

See Ground Dis-
tribution

Sequential Multi-
port Fuel Injection
(SFI–V8)

X135
Inertia Fuel Shut–
Off Switch

[1]

Impact

[1]

C111

Z134
Fuel Pump Mod-
ule

[2]

Fuel Pump

C110

[2]

See Ground Dis-
tribution

E167

S114

F 14

20 A

C114

C323

C257

Z238
Body Electrical
Control Module
(BECM)

RL6

Diesel

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