Antitheft and Alarm Systems: Description and Operation

Diagnostic functions

General
The control module has a built-in diagnostic system, the Volvo on-board diagnostic (OBD) system. This system continuously monitors itself and the input and output signals.

Diagnostic trouble codes (DTCs)
The control module will store a diagnostic trouble code (DTC) if it detects a fault. The control module can store 21 diagnostic trouble codes (DTCs) for the S70/V70 and 18 for the C70.
If a fault disappears for any reason after the diagnostic trouble code (DTC) has been permanently stored in the control module, information about the fault remains in the control module.

Reading off the Volvo on-board diagnostic (OBD) system
Fault data and other information can be read off using the VIDA PC which is connected to the data link connector (DLC) under the center console cover via VCT2000. The VIDA PC communicates with the control module via a standardized interface.

Volvo on-board diagnostic (OBD) system
With the VIDA PC it is possible to:
- read off and erase stored diagnostic trouble codes (DTCs)
- read off (and erase) alarm causes
- activate components or functions according to certain predetermined patterns
- continuously monitor the values and status of the input and output signals for the signals
- read off the control module identification
- reading off and programming the lock and alarm system.
The following conditions must be met before the Volvo on-board diagnostic (OBD) system is activated:
- the ignition must be on
- the battery voltage must be normal.

Reading and erasing diagnostic trouble codes (DTCs)
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
The on-board diagnostic (OBD) system can identify 25 different faults in the form of diagnostic trouble codes (DTCs). Diagnostic trouble codes (DTCs) can only be erased when all diagnostic trouble codes (DTCs) have been read at least once.

Reading off and erasing alarm causes
The control module can store up to 9 different alarm causes although only 5 alarm causes can be stored at the same time in the control module memory.
These alarm causes can be read off using VIDA PC via the VCT2000. NOTE: Alarm causes are erased at the same time as diagnostic trouble codes (DTCs).
Diagnostic trouble codes (DTCs) can only be erased when all diagnostic trouble codes (DTCs) have been read at least once. For each diagnostic trouble code (DTC), the frozen values for the following parameters can be read off:

The alarm causes that can be stored are
- door open
- opened tailgate or rear door
- hood open
- movement in the passenger compartment (detected by an ultrasonic sensor for S70/V70 and mass movement sensor for C70 )

Note! C70models have a mass movement sensor instead of an ultrasonic sensor.

- broken window (glass breakage sensor activated)
- car tilted (tilt sensor activated)
- resistive wire broken
- ignition on (if the car has been hot-wired for example)
- fault in the power supply (if the battery leads have been cut or there is an open-circuit in the power supply to the siren).

Activating components and functions
This function allows the system components and functions to be activated individually. The ignition must be on for activation to be possible.
The following components can be activated:

The following components and functions can be activated:
- locking all central locking motors
- unlocking all central locking motors
- unlocking only the driver's door
- unlocking only tailgate
- opening fuel tank filler cover
- locking to deadlock
- indicator LED
- turn signal lamps
- alarm activation
- alarm horn
- siren
- interior lighting.
For further information about activation, see Activating components/functions Activating Components/Functions.

Reading off input and output signals
Using this function, the values and status of the control module input and output signals can be continuously read off.

The following parameters can be read off:
- locking and unlocking signal from the driver's door lock switch
- locking / unlocking signal from the central locking switch
- unlocking signal from tailgate switch, external handle
- unlocking signal trunk lid / tailgate, from inner switch
- fuel tank filler cover opening signal from the internal switch
- signal from the door switch, driver's door
- signal from door switches, other side doors
- signal from the door switch, trunk lid or tailgate
- signal from the hood switch
- tilt sensor, alarm signal
- resistive wire, alarm signal
- airing module, airing signal
- immobilizer, signal if immobilizer is OK
- starter relay.
For further information about parameters, see Parameters Parameters.

Reading off the control module identification
The VIDA PC identifies control modules by reading a code from the memory of the module. This code contains information about the control module P/N and the present software version.

Reading off and programming the lock and alarm system
This function can be used to read off programmed data and to program data into the control module. Programming the lock and alarm functions adapts the system to market requirements and equipment levels.
All these functions are dealt with via VIDA vehicle communication.

Programming the remote control
The control module memory has room for three remote controls.
If the car is equipped with an alarm, two remote controls are programmed into the control module memory. An additional remote control can be programmed into the control module memory without needing to reprogram the control module.
It is possible to add a new remote control by erasing old ones (for example if a remote control is broken or has been lost). It is also possible to read off the number of remote controls programmed. Cars without an alarm can also have remote controls.

Programming lock type
Three lock types can be programmed - Standard, Deadlocking and Two-stage locking.
The programmed lock type can also be read off.

Note! To program deadlocking, the car must have the correct lock unit.

Programming lock and alarm functions

Turn signal lamp acknowledgement signal
This parameter governs the operation of the turn signal lamp acknowledgement signal during arming / disarming.
The following three settings are available:
- NO FLASH AT ARM AND DISARM: Indicates if there is no lamp acknowledgement via the turn signal lamps when the alarm is activated or deactivated
- FLASH AT ARM: Displays if there is a lamp acknowledgement when the alarm is armed
- FLASH AT ARM AND DISARM: Displays if there is a light response when both activation and deactivation of the alarm.
This function is market dependent, contact a manager if uncertain of this function.
- ALARM: Displays if the control module is configured for an alarm
- ULTRASONIC SENSOR: Displays if the control module is configured for an ultrasonic sensor
- MASS MOVEMENT SENSOR: Displays whether the control module is configured for a mass movement sensor
- GLASS BREAKAGE SENSOR: Displays whether the control module is configured for a glass breakage sensor
- RESISTIVE WIRE GLASS SENSOR: Displays whether the control module is configured for alarm wire in the rear windows (applies to 5 door models only)
- TILT SENSOR: Displays whether the control module is configured for a tilt sensor
- CENTRAL LOCKING SWITCH: This parameter controls whether the car can be locked with the interior central locking switches with the driver's door open and then remain locked when the door is closed
- IMMOBILIZER: This parameter controls the LED function in the dashboard indicating when the immobilizer is activated when the ignition is switched off. Applies only if the car is not equipped with an alarm.
This function is market dependent, contact a manager if uncertain of this function.
- INTERLOCK: This parameter governs the start inhibitor switch function with the clutch pedal released
This function is market dependent, contact a manager if uncertain of this function.
- AUTOMATIC ALARM ACTIVATION: This parameter controls the automatic alarm activation, the alarm is activated after the ignition is switched off and the driver's door opened and all other doors shut.
This function is market dependent, contact a manager if uncertain of this function.
- ARM ALARM VIA KEY: This parameter controls the function for activating the alarm using a key.
This function is market dependent, contact a manager if uncertain of this function.
- DISARM ALARM VIA KEY: This parameter controls the function deactivating the alarm using the key.
This function is market dependent, contact a manager if uncertain of this function.
- ARM ALARM VIA CENTRAL LOCKING SWITCH: This parameter controls the function activating the alarm using the interior central locking switches with the door open.
This function is market dependent, contact a manager if uncertain of this function.
- PANIC ALARM: This parameter controls the function to deploy the alarm using the remote control. This function requires that the remote control is equipped with an extra red button
- LOCK TYPE: This parameter governs the lock function. NORM is normal central locking. TWO STAGE requires two impulses from the remote control or the door lock cylinder to open all doors. One pulse unlocks only the driver's door.
BLL is Blocked Lock Position (deadlock). The lock is deadlocked shortly after locking. This means that the doors cannot be opened from the inside.

Note! The car must be equipped with this type of lock unit (BLL)

If the car is unlocked using the remote control and no doors are opened, the car will lock itself after two minutes. If the car has an alarm, the alarm is armed again.
The car is locked in standard mode, it is not deadlocked
- AUDIBLE ACKNOWLEDGMENT SIGNAL: This parameter governs the type of audible acknowledgement signal. Select between SIREN A1 or HORN depending on the equipment level in the car
- BODY TYPE: This parameter governs the type of car body the VGLA control module is programmed for. Select between 4D (4 door) 5D (5 door, CAB (convertible) or Coupe.