System Overview

Courtesy of VOLVO CARS CORPORATION

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 functions 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)
deadlock mode (BLL) (only in combination with alarm and only on certain markets)
private locking mode
electrical child-proof lock (option)
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 (option)
automatic locking when driving
re-locking
passive functions.
Lock status indication, LED in instrument panel as well as in doors.