System Overview: 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)

Input signals:	Output signals:
Directly connected:	Directly connected:
Position sensor (7/119, 7/121)
Via serial communication:	Via serial communication:
Left headlight control unit (LHCU) / right headlight control unit (RHCU)	Left headlight control unit (LHCU) / right headlight control unit (RHCU)
Via Controller Area Network (CAN) communication:	Via Controller Area Network (CAN) communication:
Suspension module (SUM) (4/84) Transmission Control Module (TCM) (4/28) Brake control module (BCM) (4/16) Engine control module (ECM) (4/46) Steering wheel angle sensor module (SAS) (3/130) Infotainment control module (ICM) (3/281)	Driver information module (DIM) (5/1) Infotainment control module (ICM) (3/281)

Fig 1: Identifying Central Electronic Module (CEM) Signal Types

Courtesy of VOLVO CARS CORPORATION