SECURITY/CENTRAL LOCKING
S3
CIRCUIT OPERATION
4
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):
D
Turn Ignition On (Pos. II).
D
Turn Ignition Off.
D
Disconnect within 17 seconds.
To silence if triggered:
D
Connect.
D
Disarm Alarm.
D
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.