ALARM SYSTEM AND HORN: DESCRIPTION AND OPERATION (page 3 of 8)

ALARM SYSTEM AND HORN

DESCRIPTION AND OPERATION 86-4-19

Disarming: To prevent the alarm from triggering when entering the vehicle, the alarm system must be disarmed with 
the key or the handset.

There are two perimetric alarm disarming configurations:

l

Always disarm with key.

l

Only disarm with key if locked with key.

The perimetric alarm can be disarmed by unlocking the vehicle with the handset or by using the key in the driver's 
door lock, depending on system configuration.

NOTE: The “only disarm with key if locked with key” configuration prevents the alarm from being disarmed by 
unlocking the vehicle with the handset if the vehicle has been locked by the key. In this situation the Emergency Key 
Access (EKA) code must be entered to disarm the alarm.

In order for the alarm to trigger, the following conditions must be met:

l

Perimetric alarm armed.

l

Bonnet or door opened.

Once triggered, the alarm will remain triggered for 30 seconds before resetting.

Volumetric alarm
The volumetric alarm is used by the BCU to detect movement within the vehicle. This allows the alarm to be triggered 
if a window is smashed in an attempt to gain access to the vehicle.

There are two volumetric alarm configurations:

l

Volumetric alarm not active.

l

Volumetric alarm active.

Two sensors, which transmit and receive ultrasonic signals, detect movement within the vehicle. Theses sensors 
detect any change in air movement within the vehicle and then supply the BCU a signal to activate the alarm. Fifteen 
seconds after the vehicle is locked with the handset or the key the volumetric alarm is armed. This delay is 
incorporated into the BCU software to prevent accidental or nuisance triggering of the alarm.

In order to arm the volumetric alarm, the following conditions must be met:

l

Driver's door closed.

l

Key not inserted in ignition.

l

Fuel cut-off switch not tripped.

To prevent the alarm from triggering when entering the vehicle, the alarm system must be disarmed with the key or 
the handset.

There are two volumetric alarm disarming configurations:

l

Always disarm with key.

l

Only disarm with key if locked with key.

The volumetric alarm can be disarmed by unlocking the driver's door with the key or the handset, depending on 
system configuration.

NOTE: The “only disarm with key if locked with key” configuration prevents the alarm from being disarmed by 
unlocking the vehicle with the handset if the vehicle has been locked by the key. In this situation the EKA code must 
be entered to disarm the alarm.

In order for the alarm to trigger, the following conditions must be met:

l

Volumetric alarm armed.

l

Volumetric sensors triggered.

Once triggered, the alarm will remain triggered for 30 seconds before resetting.