Operation CHARM: Car repair manuals for everyone.
Home >> Volvo >> 2002 >> S60 T5 L5-2.3L Turbo VIN 53 B5234T3 >> Repair and Diagnosis >> Accessories and Optional Equipment >> Antitheft and Alarm Systems >> Description and Operation >> Alarm >> System Description

System Description






System description

General




The alarm function is a distributed function and uses a number of control modules for its function.
The control modules used for the alarm function are:
- Central electronic module
- Climate control module
- Driver's door module
- Driver information module
- Inclination sensor module
- Mass movement sensor
- Passenger door module
- Rear electronic module
- Siren control module
- Upper electronic module.

Terminology
The following terms are used in information about the alarm.
Activated: The car is locked and the alarm protects the car.
Deactivated: The alarm is switched off and no longer protects the car.
Reactivating: The alarm has activated itself and protects the car.
Deployed: The alarm has started and the siren sounds.

Central electronic module
The central electronic module (4/56) is the main control module for alarm functionality. The central electronic module determines how the alarm should be activated, deactivated or deployed by receiving information on the Controller Area Network (CAN) from other control modules and via the directly connected signal cables from the components.
Signal cables are directly connected to the central electronic module from:
- Switch in the lock units in all doors (3/74-77), open/closed
- Switch in the lock units in the rear side doors (3/76-77), locked / unlocked
- Switch in the lock unit trunk lid (3/78), open/closed. (S60/S80)
- Switch in the lock unit tailgate (3/78), open/closed. (V70/V70XC). In certain versions the signal is in series with the resistive wire in the rear side window. See the current wiring diagram
- Switch hood (3/62), open/closed
- Resistive wire (7/135-137), broken/unbroken (only V70/V70XC). Protects rear side windows, on certain versions this includes the rear windshield, see the current wiring diagram.
The central electronic module is controlled via a direct cable:
- All turn signal lamps.
For information received and transmitted via the controller area network for alarm functionality see the relevant control module as follows.

Climate control module
The climate control module (3/112) transmits information via the Controller area network (CAN) to the central electronic module about the status of the switch for reduced alarm (3/174).
Signal cables are directly connected to the climate control module from:
- Switch for reduced alarm (3/174), on/off.
The climate control module controls via direct cables:
- Alarm diode (7/12) in the dashboard, on/off. The signal is received via the directly connected cable from the central electronic module.

Driver's door module
The driver's door module, (Left-hand drive; 3/126, Right-hand drive; 3/127) transmits information via the Controller area network (CAN) to the central electronic module if the lock is locked or unlocked in the driver's door and if the door has been unlocked using a key.
Signal cables are directly connected to the driver's door module from:
- Switch in the lock units in the driver's doors (3/74), locked / unlocked
- Switch in the lock units in the driver's doors (3/74),locking / neutral position / unlocking. The signal comes from the door lock and indicates the position of the door key in the lock.

Driver information module
Driver information module (5/1) gives text messages in the text window and receives information from the central electronic module via the Controller area network (CAN). The text messages given are information about the status of the alarm system.

Inclination sensor module (market dependent/option)
The Inclination Sensor Module (7/100) transmits information via the serial communication (Volcano Lite) to the rear electronic module, about the vehicle inclination sensor status. The rear electrical module transmits information to the central electronic module via the Controller area network (CAN).

Mass movement sensor (Market dependent/option)
The mass movement sensor (7/122) transmits information about the movement in the car to the upper electrical module via the serial communication (Volcano Lite). The upper electrical module transmits information to the central electronic module via the Controller area network (CAN).

Passenger door module
The passenger door module (Left-hand drive; 3/127, Right-hand drive; 3/126) transmits information via the Controller area network (CAN) to the central electronic module if the lock is locked or unlocked in the passenger door.
Signal cables are directly connected to the passenger door module from:
- Switch in the lock unit in the passenger door, locked/unlocked.

Rear electronic module
The rear electrical module (4/58) transmits information via the Controller area network (CAN) to the central electronic module about the status of the inclination sensor module. Information about the status is transmitted by the Inclination Sensor Module to the rear electrical module.

Siren control module
The task of the control module is to supply the car with the siren sound. The siren control module (16/35) can activate the siren noise in three ways:
- The central electronic module transmits information via the controller area network to the upper electronic module to deploy the alarm. The upper electronic module transmits information via serial communication (Volcano Lite) to the siren control module, which starts the siren
- The siren control module has an integrated battery which is used as a back-up in the event of an alarm. The battery charges via an integrated charger. The siren control module monitors the power supply from the car battery to the control module. If the voltage from the car battery suddenly drops (open-circuit in the cable) the siren is activated
- The siren control module monitors the communication cable from the upper electronic module (life pulse) and if the communication ceases the siren is activated.
The siren control module transmits information about the status of the internal battery to the UEM via serial communication via serial communication (Volcano Lite).

Upper electronic module
The upper electronic module (4/70) transmits information via the Control area network (CAN) to the central electronic module, about which button on the remote control is depressed and the status of the siren.
The central electronic module in turn sends information to the upper electronic module via the Controller area network (CAN), if the siren must be activated. The upper electronic module transmits information via serial communication (Volcano Lite) to the siren control module, which activates the siren.

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