System Overview

System overview

General

C30/S40/V50





C70





Note! This document describes the central locking system in cars with a keyless vehicle module (KVM). Some components are different from the standard central locking system. This document outlines the main functionality of the central locking system with keyless entry. For more detailed information about the keyless entry system, see Design and Function, keyless vehicle module (KVM).

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 (only 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
- Passive functions
- 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 motor in the trunk lid/tailgate when the lock button is pressed. The trunk lid/tailgate can then be opened. On the C70 it also unlocks the storage compartments and the lock for the ski hatch. Unlocking can be carried out using the button on the remote control or by using the key blade in the driver's door lock cylinder. There are two settings:
- total
- 2 stage.
Total unlocking unlocks all doors at the same time. The American market has 2 stage unlocking. 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. When unlocking a 2 stage system with the key, the key must be turned counter-clockwise twice for all doors to unlock.

Deadlock
Deadlocking is an option. Deadlocking means that the inner door handles and lock buttons are disengaged when the central locking is activated. 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. This function requires lock units with lock motors for this function. The function can be temporarily 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 switch is on the switch panel on the driver's door. 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" position 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 or trunk lid is directly connected to the keyless vehicle module (KVM) and to the central electronic module (CEM). The lock motor is directly connected to the central electronic module (CEM).
For the C70 (model year 2006 and early 2007 versions), the following applies:
To access the cargo compartment when, for example, the vehicle has no power, there is a lock cylinder under the CD compartment in the center console, which is mechanically connected to the cargo compartment lock.
For the C70 (late versions 2007-), the following applies:
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) at the side 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 when the vehicle is parked.

Switches for doors, tailgate/trunk lid and hood
There are switches in the lock units on the side doors and tailgate/trunk lid which indicate whether the doors or trunk lid/tailgate are open or closed. These switches are also known as door open sensors. There is also a separate 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.

Passive functions
The passive functions are controlled by the keyless vehicle module (KVM). These passive functions cover unlocking, locking and vehicle start. To this end, certain components are connected to the keyless vehicle module (KVM) instead of the central electronic module (CEM). For more detailed information about the passive functions, see Design and Function, keyless vehicle module (KVM).

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) or via VIDA.

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.
The remote control also supports keyless functionality when installed in the vehicle. This means that there is an additional communication circuit in the remote control compared to a "standard" remote control. However, the appearance of the remote control is identical.

Panic function
The panic function can be activated using the remote control. The panic function activates the horn for 25 seconds. This function is to attract attention in an emergency situation.

Unlocking using the key
Applies to the C30/S40/V50:
The driver's door can be locked and unlocked using the key blade which is normally retracted inside 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.
The lock cylinder on the driver's door has a cover. This cover must first be removed to expose the lock cylinder. This is done by inserting the mechanical key in a hole on the underneath of the cover and pulling out.
Applies to the C70:
The driver's door can be locked and unlocked using the key blade which is normally retracted inside the remote control. This type of lock is also available on the passenger's door on the C70. On the C70, it is also possible to unlock and open the trunk lid from inside the passenger compartment. There is a lock cylinder in the storage compartment in the tunnel console that is mechanically directly connected to the locking function in the trunk lid. This is an extra solution should there be a fault in the system.
The lock cylinder on the driver's door has a cover. This cover must first be removed to expose the lock cylinder. This is done by inserting the mechanical key in a hole on the underneath of the cover and pulling out.

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
Volvo On Call can be used to unlock the vehicle from a Volvo Service Center if the customer is unable to open the vehicle in the normal way for any reason. For further information about Volvo On Call, see Design and Function, phone module (PHM).