Reduced Alarm Function
The switch for reduced alarm function is located in the climate control comfort panel. The switch is used to temporarily deactivate the inclination sensor module (ISM), mass movement sensor module (MMS) and deadlock mode when the vehicle is locked. An integrated LED in the switch indicates when the function is activated.
The function is activated during a locking cycle, i. e. from the time the button is depressed and the vehicle is locked until the vehicle is unlocked. When the ignition is once again turned to position II, reduced function is deactivated.
Examples of applications for this function include when a person or pet remains inside the vehicle after the vehicle has been locked, and if the vehicle is transported by tow truck or onboard a ferry.
Scheme 79
The alarm is an entry protection system for the vehicle. The aim is to prevent anyone getting into the vehicle or manipulating the vehicle in any way without being detected.
The alarm is available in various configurations
- Basic configuration. This configuration includes switches in the lock units (including switches in the hood and trunk lid/tailgate), an alarm LED and a siren (SCM). mass movement sensor module (MMS) inclination sensor module (ISM) glass breakage sensors in rear side windows and rear window (V70/XC70 only)
- Extended configuration. Can include one or more of the following components: mass movement sensor module (MMS) inclination sensor module (ISM) glass breakage sensors in rear side windows and rear window (V70/XC70 only)
Definitions
- Deactivated: The alarm is not activated and is not protecting the vehicle.
- Activated: The alarm is protecting the vehicle and will be triggered if there is an input signal from one of the sensors.
- Triggered: An alarm cycle has started. The siren sounds for 25 seconds and the turn signal lamps flash for approximately 5 minutes.
- Reactivated: The alarm has been triggered and an alarm cycle has been completed. If a check of the sensors in the vehicle shows that they are OK the alarm will be reactivated.
The tables below summarize the input and output signals to the units in the system for the alarm. The signal types are divided into directly connected signals, serial communication and controller area network (CAN) communication.
| Input signals | Output signals |
|---|---|
| Directly connected | Directly connected |
| Glass breakage sensors (7/135-7/137) (V70/XC70 only). Switch in lock unit (3/74) for indicating open driver's door. Switch in lock unit (3/75) for indicating open passenger door. Switch in lock unit (3/76) for indicating open door, left rear. Switch in lock unit (3/77) for indicating open door, right rear. Switch in hood lock (3/62) for indicating open hood. Switch in lock unit (3/78) for indicating open trunk lid/tailgate. | Alarm LED (7/12) for indicating alarm status. Inclination sensor module (ISM) (7/100), power supply. |
| Via serial communication | Via serial communication |
| Inclination sensor module (ISM) (7/100) for information about vehicle position. | Inclination sensor module (ISM) (7/100) for status request. |
| Via CAN communication (LS-CAN) | Via CAN communication (LS-CAN) |
| Reduced alarm switch (3/174) via the climate control module (CCM) (3/112) for deactivation of the inclination sensor module (ISM), the mass movement sensor module (MMS) and deadlock mode. Upper electronic module (UEM) (4/70) for signals from the mass movement sensor module (MMS), siren (SCM) and commands from the remote control. | The driver information module (DIM) (5/1) for information about which message is to be displayed. Upper electronic module (UEM) (4/70) for siren (SCM) activation. Central electronic module (CEM) (4/56) for activating direction indicator lamps when the alarm is triggered and the horn during triggered panic function. |
Rear electronic module (REM) (4/58)
| Input signals | Output signals |
|---|---|
| Directly connected | Directly connected |
| For S60/S80/V70/XC70: Mass movement sensor module (MMS) (7/122), power supply. | |
| Via serial communication | Via serial communication |
| For S60/S80/V70/XC70: Mass movement sensor module (MMS) (7/122). Communication with the siren (SCM) (16/35). | For S60/S80/V70/XC70: Mass movement sensor module (MMS) (7/122). Communication with the siren (SCM) (16/35). |
| Via CAN communication (LS-CAN) | Via CAN communication (LS-CAN) |
| Rear electronic module (REM) (4/58) with request for function activation. | Rear electronic module (REM) (4/58) with command for siren (SCM) activation. |
Upper electronic module (UEM) (4/70)
The control unit has built-in diagnostics, Volvo Diagnostics, that continually monitor the control unit and the input and output signals.