Function
Function
Alarm cycle
An alarm cycle is the time it takes for the system to switch from triggered alarm, through alarm disarming procedures until the alarm is re-armed. This setting is market dependent. In Sweden for example, if the alarm is triggered the alarm can be set so that the horn will sound and the hazard warning signal flashers will flash for approximately 30 seconds, and the hazard warning signal flashers will then flash on their own for a further 5 minutes approximately. The car then reverts to its previous mode with the alarm re-armed.
Arming and triggering the alarm
When the system receives the "LOCK" signal from the remote control or the key is turned towards the "LOCKED" position, the doors are locked and the system switches to wait state. During the following 25 seconds, the system monitors whether the driver's door is opened. If this happens, the alarm is disarmed and the doors are unlocked. The locking sequence can be cancelled with the key, remote control or by other action.
After this time, the sensors are active and can trigger the alarm. If any sensors trigger the alarm, an "alarm cycle" begins. The turn signal lamps start to flash, the interior lighting comes on and the siren sounds for approximately 25 seconds. This can be disarmed by unlocking the car using the remote control or inserting an approved key into the ignition and turning it to position I.
If nothing happens during this 25 seconds, the system goes into a wait state. The siren is switched off and the sensors are calibrated for 5 seconds. After this, the system is rearmed and the alarm is active again. However the turn signal lamps continue to flash for approximately a further 5 minutes.
If nothing happens during this time, the turn signal lamps switch off and the system is set to re-armed mode. However the indicator on the dashboard indicates that the alarm has been triggered. Information about the triggering of the alarm is stored in the VGLA control module and can be read off using VIDA.
Disarming the alarm
During disarming, the system receives a coded signal from the remote control. This code is checked against a code which is programmed into the VGLA control module. If codes match, the alarm is disarmed and the doors are unlocked. The alarm is also reset if it has been triggered.
If the alarm has been triggered, it can also be reset by inserting an approved key in the ignition switch. In this case, the immobilizer control module validates the key and transmits a signal to the VGLA control module to disarm the alarm.
Interior lighting
The interior lighting is completely controlled by the VGLA control module. The following is included in interior lighting:
- roof lamp with or without sun roof control
- courtesy lighting
- rear reading lamps
- cargo compartment lighting
- vanity mirror lighting on the driver and passenger sides
- the lighting in the glove compartment.
All interior lighting is checked by the VGLA control module except for the lighting in the vanity mirrors, in the glove compartment and cargo compartment.
The basic function, i.e. whether the light should be on or not is controlled by a switch in the roof lamp.
The interior lighting lights:
- when the alarm is disarmed using the remote control or the key
- when a door is opened
- when the alarm is triggered.
There is a soft start and dimming function for the interior lighting. These functions are only active if the ignition is switched off. When the car is unlocked, the interior lighting comes on for approximately 30 seconds or until the ignition is switched on. This happens as long as the doors are closed. If any of the doors are open, the interior lighting remains on until all doors are closed.
The dimming function keeps the interior lighting on for approximately 30 seconds after the last door has been closed. If the vehicle is locked with the key or remote control, the interior lighting switches off immediately.
If the car is stationary with the door open and the key is not in the ignition switch, the interior lighting switches off after 15 minutes to prevent the battery from draining.
Collision
In the event of a collision, the VGLA control module receives a signal from the Supplemental Restraint System Module (SRS) indicating that the doors must be unlocked. This also disengages deadlocking if installed and activated. Unlocking normally takes place when the Supplemental Restraint System Module (SRS) has deployed one or more airbags or seat belt tensioners. However in the event of a collision from the rear, the doors may unlock without the deployment of any unit in the SRS system.