System Overview

System overview

General
From 2012 model year the functions for automatic headlamp levelling and active headlamps will be controlled and monitored from the Central electronic module (CEM).

Note! On vehicles before 2012 model year there is a separate control module, the Headlamp Control Module (HCM), for controlling and diagnosing the automatic headlamp levelling and active headlamp functions.

Signals
The table below summarizes the input signals to and output signals from the central electronic module (CEM). The signal types are divided into directly connected signals, serial communication and controller area network (CAN) communication. The illustration below displays the same information with the Volvo component designations.

Central electronic module (CEM) (4/56)