System Overview: Signals

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2009 Volvo S60, 2008 Volvo S60, 2007 Volvo S60, 2006 Volvo S60, and 2005 Volvo S60. However, it is still accessible from the selected car via links, so may be relevant.

The chart below summarizes the input signals to and output signals from the headlight control module (HCM). The signal types are divided into LIN communication and CAN communication. The illustration below displays the same information with the Volvo component designations.

Input signals:	Output signals:
Via LIN communication:	Via LIN communication:
Left headlight control unit (LHCU) / right headlight control unit (RHCU)	Left headlight control unit (LHCU) / right headlight control unit (RHCU)
Via CAN communication:	Via CAN communication:
Transmission Control Module (TCM) (4/28) Brake control module (BCM) (4/16) Steering wheel angle sensor module (SAS) (3/254) Climate Control Module (CCM) (3/112). Central electronic module (CEM) (4/56)	Driver information module (DIM) (5/1) Climate Control Module (CCM) (3/112). Central electronic module (CEM) (4/56)

Fig 1: Identifying Headlight Control Module (HCM) Communication System Links

Courtesy of VOLVO CARS OF NORTH AMERICA.