System Overview: General

Fig 1: Identifying System Overview Of Central Locking, Keyless Entry System

Courtesy of VOLVO CARS CORPORATION

NOTE:

This document describes the central locking system in cars with the 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.

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)
deadlocked (not USA/CDN)
private locking mode
electrical child-proof lock (option)
unlocking the 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.