System Overview

System overview

General

C30/S40/V50





C70




The central locking system contains a number of functions. The system is monitored by the central electronic module (CEM). The central electronic module (CEM) communicates with the constituent units, whether directly connected or connected in series, via the CAN network.

The functions covered are:
- standard locking function (total or 2 stage)
- deadlocking
- private locking mode
- child-proof lock (S40/V50)
- unlocking the trunk lid/tailgate
- unlocking the fuel tank filler cover
- light functions (local lighting and approach lights)
- indication of the status of the doors and hatches
- remote unlocking
- automatic locking function
- re-locking
- lockable storage compartment (option C70)
- lock for ski hatch (C70).

Standard locking function
The standard locking function unlocks the side doors and activates the lock button so that the tailgate/trunk lid can be opened. On the C70 it also unlocks the storage compartments and the lock for the ski hatch. There are two settings:
- total
- 2 stage.
Total unlocking unlocks all doors at the same time. 2 stage locking unlocks the driver's door first and then the other doors. The driver's door unlocks on the first press of the unlock button on the remote control. On the C70 the storage compartments and ski hatch unlock as well. Press the button again within 10 seconds and the other doors unlock.

Deadlock
Deadlocking is an option. Deadlocking means that the inner door handles and lock buttons are disengaged. It will not then be possible to open a side door from the inside, even if a window is smashed. Deadlocking is activated 25 seconds after the vehicle was locked. The function can be disengaged using the switch for reduced alarm.

Valet locking mode
The glove compartment and cargo compartment can be locked to "valet' mode. On the C70, the storage compartments and the ski hatch lock also have the valet mode function. This function is used to block access to these compartments when, for example, leaving the car for a service when there are personal belongings left in the car or when the roof is left open (applies to the C70) when parked.

Child-proof lock (only S40/V50)
Child-proof locking disengages the rear internal door handles. The rear window lift mechanisms cannot be operated either if child-proof locking is activated.

Unlocking the trunk lid/tailgate
In practice there is no "locked" mode for the lock on the tailgate/trunk lid. The difference between locked and unlocked is whether the central electronic module (CEM) will activate the lock motor or not when the switch on the tailgate/trunk lid is pressed.
The tailgate/trunk lid is "locked" and "unlocked" at the same time as other doors if an unlock command is received from the remote control. The tailgate/trunk lid can also be unlocked separately using a dedicated button on the remote control.
The switch on the tailgate/trunk lid and the lock motor are directly connected to the central electronic module (CEM).
Applies to the C70:
To access the cargo compartment when, for example, the vehicle has no power, there is a lock cylinder on the left-hand side front edge of the rear seat, which is mechanically connected to the cargo compartment lock.

Unlocking the fuel tank filler cover
The unlocking switch for the fuel tank filler cover is on the light switch module (LSM) to the left of the driver. The button is directly connected to the central electronic module (CEM). The lock motor for the fuel tank filler cover is at the rear edge of the fuel tank filler cover. The lock motor is directly connected to the central electronic module (CEM).

Light functions
Local lighting and approach lights are part of the system.
Local lighting is activated using the remote control. Approach lights are activated when the high/low beam switch is pulled backwards.

Switches for doors, tailgate/trunk lid and hood
There are switches at the side doors and tailgate/trunk lid which indicate whether the door is open or closed. There is also a switch at the hood if the car has an alarm. There is no switch at the fuel tank filler cover. The switches are closed when the door is closed, providing a ground connection to the central electronic module (CEM).

Automatic locking
The system can be activated so that the car is locked automatically when the car reaches 7 km/h (5 mph). Whether this function is activated on delivery or not depends on the market.

Re-locking
The system has a function for re-locking. If the car is unlocked using the remote control or key and the side doors or trunk lid/tailgate are not opened within 2 minutes, the car will be locked automatically. This function prevents the car from being left unlocked unintentionally.

Text message for the lock system
The text message display in the driver information module (DIM) indicates whether child-proof locking, valet locking or reduced alarm is activated. There is also an alert message if a door opens whilst driving.

Customer settings
The customer can make certain settings to determine how the locking system works. For more information, see: Diagnostic functions Diagnostic Functions

Acknowledgements
The turn signal lamps give a long flash to confirm that the car is fully locked. They flash twice when the car is unlocked. The customer can decide whether the acknowledgement is activated or not via the menu system in the infotainment control module (ICM).

Remote control
The central locking system can be unlocked using the remote control.
The remote control has buttons for:
- unlocking
- locking
- unlocking the trunk lid/tailgate
- panic function
- local lighting.

Panic function
The panic function activates the horn for 25 seconds. This function is to attract attention in an emergency situation.

Unlocking using the key
The driver's door (also the passenger doors and cargo compartment on the C70) can be locked and unlocked using the key blade in the remote control. This is an extra solution should there be a fault in the system. The other doors can be unlocked using the inner central locking buttons after the key is inserted in the ignition.

Local locking (C70)
Usually there are locking buttons in the doors, but the C70 does not have these. The vehicle is equipped with LEDs instead that indicate whether the vehicle is locked or not. The LEDs light for approximately 5 minutes after locking the vehicle. The LEDs are on each door.

Remote unlocking
The Volvo On Call service can unlock the vehicle from the Volvo Service Center.