System Overview: Signals

The table below summarizes the input signals to and output signals from the headlamp control module (HCM). The signal types are divided into directly connected signals, serial communication and CAN communication. The illustration below displays the same information with the Volvo component designations.

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 Angle Sensor Module (SAS) (3/130) Climate control module (CCM) (4/6) Central electronic module (CEM) (4/56)	Driver information module (DIM) (5/1) Climate control module (CCM) (4/6)

Courtesy of VOLVO CARS CORPORATION