System Overview: Signals

The table below summarizes the input signals to and output signals from the steering wheel module (SWM). The signal types are divided into directly connected signals, LIN and CAN communication. The illustration below (Fig 1) displays the same information with the Volvo component designations.

Input signals	Output signals
Directly connected:	Directly connected: (Power supply unless otherwise stated)
Right-hand control stalk (3/134) Left-hand control stalk (3/133).	Headlamp flash directly connected to the central electronic module (CEM) (4/56).
Via LIN communication:	Via LIN communication:
Steering wheel switches left (SWSL) (3/131) Steering wheel switches right (SWSR) (3/4).	Infotainment control module (ICM) (16/1).
Via Controller Area Network (CAN) communication:	Via Controller Area Network (CAN) communication:
Central electronic module (CEM) (4/56).	Engine control module (ECM) (4/46) Accessory electronic module (AEM) (4/78) (optional equipment) Central electronic module (CEM) (4/56). The Brake control module (BCM) (4/16) (only vehicles equipped with DSTC) Electrical power steering module (EPS) (4/99) Combustion preheater module (CPM) (4/7).

Fig 1: Identifying System Overview

Courtesy of VOLVO CARS CORPORATION