Control module

Fig 1: VGLA Control Module

Courtesy of VOLVO CARS OF NORTH AMERICA.

The main task of the VGLA control module is to control and monitor the locking and alarm system in the car. The control module is located in the center under the dashboard in front of the gear selector lever. The control module supports various functions, depending on the equipment level of the system.

There are three versions of the control module:

LAS-A: for central locking using the remote control or key controlled central locking without child-proof locking
LAS-B: for remote controlled central locking with deadlocking
LAS-C: for key or remote controlled central locking with or without deadlocking and with 2-step function (2-step, only USA/Canada/Israel).

Two lock motors are installed for deadlocking. One motor locks the door. The other disengages the lock button and the inner door handle automatically 25 seconds after the vehicle has been locked and all the doors closed. It will not then be possible to open the door from the inside, even if a window is smashed for example.

The 2-step function, where the car is unlocked in two stages, is only available in certain markets. When the remote control is pressed once, the driver's door is unlocked. When pressed again within 10 seconds, the other doors are unlocked. This is to prevent someone from "sneaking" in to the car when all doors are unlocked at the same time.

The required functions must be programmed into the control module. For information about programming lock and alarm functions, except for remote controls, see Description of the programmed values .

The turn signal lamps flash when the alarm is armed. The number of times the lamps flash can be set according to the wishes of the customer. The default setting is a long signal on arming and two short on disarming.

In the event of a collision, if the ignition is on, the VGLA control module receives a signal from Supplemental Restraint System Module (SRS) to unlock the doors. The VGLA control module also disengages the deadlocking and child-proof locks if these are engaged.

The VGLA control module communicates with the immobilizer control module via a hardwired cable. If a correct key is inserted in the ignition switch, a signal is transmitted from the immobilizer control module via this cable to disarm the alarm and release the deadlocks (if applicable). The VGLA control module works together with the immobilizer control module. However both systems are also able to function independently of each other. In order for communication to function, the code from the immobilizer control module must be programmed into the VGLA control module. Programming is performed when installing a new control module.

In configurations with remote controls, the unique ID numbers of the remote controls must be learned by the VGLA control module before it can function. This takes place during installation at the factory. The VGLA control module can be programmed with up to three remote control IDs. Two remote controls are normally stored when the car is delivered.

The VGLA control module is powered directly from the battery.