System Overview: Notes

Fig 1: Locating Central Locking System Control Modules

Courtesy of VOLVO CARS CORPORATION

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/CAN)
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.