Discovery 2. Manual - part 329

ALARM SYSTEM AND HORN

DESCRIPTION AND OPERATION 86-4-21

Passive immobilisation
Passive immobilisation prevents the vehicle from being started unless the authorised key is used to start the vehicle.

There are only two configurations for passive immobilisation:

passive immobilisation not active

passive immobilisation active

When the ignition is switched off, the vehicle remains mobilised for up to a maximum of 5 minutes. If however the
driver's door is opened, after 2 minutes 30 seconds, the vehicle remains in a mobilised state for a further 30 seconds.
When the timer in the BCU has expired, the vehicle is immobilised.

Once the ignition is switched on, the BCU transmits a coded signal to the ECM. If the coded signal does not
correspond to the programmed code in the ECM, the ECM is inhibited and the BCU inhibits the starting circuit.

In order for passive immobilisation to occur, the following conditions must be met:

Driver's door closed.

Fuel cut-off switch not tripped.

Key not inserted in ignition.

Passive remobilisation
Whenever the vehicle is immobilised, passive remobilisation of the engine occurs when the ignition is switched on,
allowing the vehicle to be started.

There are three configurations for passive remobilisation:

Passive immobilisation not active.

Passive immobilisation active.

EKA with super locking on receiving good passive remobilisation exciter coil signal.

The BCU controls the passive remobilisation exciter coil (located around the ignition barrel) to generate a magnetic
field which causes the handset to transmit a remobilisation signal. The BCU receives the signal and allows the vehicle
to be started. If a valid signal from the handset is not received within one minute of the ignition being switched to
position II, the BCU stops the passive coil from generating the magnetic field.

Emergency key access
If the handset fails to operate, the engine can be remobilised by using the key to enter a unique four digit Emergency
Key Access (EKA) code.

There are three configurations for emergency key access:

EKA not active (no immobiliser fitted).

EKA active.

EKA with super locking on receiving good passive remobilisation exciter coil signal.

ALARM SYSTEM AND HORN

86-4-22 DESCRIPTION AND OPERATION

The code is recorded on the security information card and is entered as follows:

1 Using the key, turn the driver's door lock to the UNLOCK position and hold in this position for at least 5 seconds.

An audible warning is then emitted to indicate that the body control unit is ready to accept the code. Return the
key to the centre position. It is now possible to use the key to enter the separate numerical values of the four
digits that make up the EKA code.

2 Enter the first digit of the code. If the first digit is 4, turn the key to the UNLOCK position 4 times. Ensure the

key is fully returned to the centre position after each turn of the key.

3 Enter the second digit of the code. If the second digit is 3, turn the key to the LOCK position 3 times. Ensure

the key is fully returned to the centre position after each turn of the key.

4 Enter the third digit of the code. If the third digit is 2, turn the key to the UNLOCK position twice. Ensure the key

is fully returned to the centre position after each turn of the key.

5 Enter the fourth digit of the code. If the fourth digit is 1, turn the key to the LOCK position once. Ensure the key

is fully returned to the centre position after each turn of the key.

6 Finally, turn the key to the UNLOCK position and back to the centre position, a double bleep will indicate that

the code has been entered correctly. A single bleep indicates that the code has been entered incorrectly.

Then, before opening the door, wait 5 minutes for the alarm and immobiliser to be de-activated. During the 5
minute wait for the alarm and immobiliser to be de-activated, the alarm indicator LED in the instrument pack
continues to flash (one flash every 2 seconds). DO NOT OPEN THE DOOR OR ATTEMPT TO ENTER THE
CAR until the full delay period has elapsed.

When the 5 minute wait has elapsed, the alarm indicator LED stops flashing. Immediately open the door, insert
the key in the ignition switch and turn the switch to position II. If the ignition switch is not turned to position II
within 30 seconds of the end of the 5 minute wait, the engine is automatically immobilised again.

The EKA code will not be recognised if there is an interval of 10 seconds or more between key turns or if the key is
held turned for 5 seconds or more during the procedure.

In some system configurations a successful EKA code entry is indicated by the audible warning device pulsing twice
for a period of 50 ms on, 200 ms off. The theft deterrent LED is switched on for 1 second, all doors unlock, the alarm
disarms and the vehicle is remobilised allowing the engine to start.

If an incorrect code is entered, an audible warning is emitted and the procedure must be repeated. Up to a maximum
of 10 attempts to enter the code is possible. After 10 attempts, the BCU will not allow any further codes to be entered
for a period of 10 minutes.

Single point entry
Single point entry (SPE) allows the driver to unlock the driver's door while leaving all other doors locked.

There are two configurations for single point entry:

SPE not active.

SPE active.

To use SPE, press the unlock button on the handset once. Depressing the unlock button a second time in the space
of one minute unlocks the remaining doors. SPE is also possible by turning the key in the driver's door lock to the
unlock position once. Turning the key to the unlock position again within one minute unlocks the remaining doors.

In order for SPE to operate, the following conditions must be met:

The ignition is off.

All doors are locked.

Speed related locking
For added protection the vehicle doors can automatically lock when the vehicle exceeds a specific road speed.

There are two configurations for speed related locking:

Speed related locking not active.

Speed related locking active.

Speed related locking causes the doors to automatically lock when the vehicle exceeds a speed of 4 mph (7 km/h).
When the ignition is switched off, the doors are automatically unlocked. Depressing the instrument panel mounted
central door unlocking switch disables the speed related locking for the duration of the journey.

Speed related locking only activates once per ignition cycle. If speed related locking activates and a door is then
unlocked, the door does not automatically re-lock.

ALARM SYSTEM AND HORN

DESCRIPTION AND OPERATION 86-4-23

In order for speed related locking to activate the following conditions must be met:

All doors unlocked.

Engine running.

Vehicle speed greater than 4 mph (7 km/h).

Acclimatisation related locking
Acclimatisation related locking allows the engine to be started and then the vehicle locked with a spare key and left
unattended to allow the vehicle interior to reach the desired temperature.

There are two configurations for acclimatisation related locking:

Acclimatisation related locking not active.

Acclimatisation related locking active.

Once the engine is started, the vehicle is locked with a spare key at the driver's door while the engine is running.
During these conditions the alarm is not armed.

In order to activate acclimatisation related locking the following conditions must be met:

Engine running.

All doors closed.

Visual warnings
The direction indicators serve as a visual indication when the alarm is triggered. The direction indicators are also used
as a visual indication during lock/unlock procedures.

There are three configurations of alarm armed/disarmed indication:

No direction indicators on, alarm armed/disarmed/trigger.

Direction indicators on, alarm trigger only.

Direction indicators on, alarm armed/disarmed/trigger.

Dependent on system configuration the direction indicators flash one short pulse to confirm that the alarm is armed
and flash two short pulses to confirm that the vehicle is super locked. If the alarm is triggered the direction indicators
operate in phase with the audible warning. When the alarm is disarmed, the direction indicators flash one long pulse.

Audible warning
An audible warning device is used to indicate that the alarm has been triggered, or a mislock has occurred, or an EKA
request has occurred, or the EKA code has been entered.

There are six audible warning configurations:

No sound (audible warnings disabled).

Alarm sounder only.

Vehicle horn only.

Alarm sounder and vehicle horn.

BBUS only.

Alarm sounder, vehicle horn and BBUS.

Depending on which market the vehicle is sold, either the vehicle horn, a specific alarm sounder, or a BBUS operates
in phase with the direction indicators when the alarm is triggered. The audible warning device operates for
approximately 30 seconds at 0.25 second on, and 0.25 second off. The BCU allows the alarm to be triggered up to 3
times in any armed period.

Theft deterrent LED
An LED located in the instrument pack indicates the status of the alarm system.

There are eight theft deterrent alarm configurations:

No handset low battery warning.

Handset low battery warning.

No passive immobilisation.

Passive immobilisation.

Engine immobilised (ignition off, LED off).

Engine immobilised (ignition off, LED flashes).

No alarm tampered indication.

Alarm tampered indication.

ALARM SYSTEM AND HORN

86-4-24 DESCRIPTION AND OPERATION

The theft deterrent LED utilises a particular flash to show the status of the following:

Alarm armed.

Engine immobilised.

Alarm tampered.

Handset low battery warning.

Transit mode
To prevent excessive battery drain during transportation to overseas markets, the vehicle is placed in a transit mode
at the end of line test.

The following functions are disabled when the vehicle is in transit mode:

Volumetric sensors.

Passive immobilisation.

Mobilisation of the vehicle by use of door lock.

Ignition key interlock.

Electric seat enable time-out with drivers door open.

To exit this mode, switch on the ignition and simultaneously hold down the heated rear window and the rear fog lamp
switch for 2 seconds.

Transit mode can be entered using Testbook.

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