Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSVOLVO2011C30 R-DESIGN, AUTOMATICREPAIR AND DIAGNOSISELECTRICALBODY ELECTRICALMISCELLANEOUS ELECTRICAL - DESIGN AND FUNCTION - 4 OF 4STEERING WHEEL MODULE (SWM) (2007-2011)SYSTEM OVERVIEWSIGNALS

2011 Volvo C30 R-Design, Automatic

System Overview: Signals

2011 Volvo C30 R-Design, AutomaticSECTION 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 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

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.