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 MANUALSVOLVO2009XC70 BASEREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEMSELECTRICAL MODULES AND COMPONENTS - DESIGN AND FUNCTION - 5 OF 5STEERING WHEEL ANGLE SENSOR MODULE (SAS)SYSTEM OVERVIEWSIGNALS

2009 Volvo XC70 Base

System Overview: Signals

2009 Volvo XC70 BaseSECTION Signals

The table below summarizes input and output signals to and from the steering wheel angle sensor module (SAS). The signal types are divided into directly connected signals, and CAN communication.

Input signals	Output signals
Directly connected:	Directly connected:
Steering wheel angle sensor (7/91). Provides the steering wheel angle sensor module (SAS) with relevant information about the steering wheel angle from the straight ahead position, the speed of the steering wheel movements and about which direction the steering wheel is turned.
Via Controller Area Network (CAN) communication:	Via Controller Area Network (CAN) communication:
	Steering wheel angle sensor module (SAS) provides the following control modules with information about, among other things, the position of the steering wheel and the speed of the steering wheel movement. Brake control module (BCM) (4/16) Suspension module (SUM) (4/84) Engine control module (ECM) (4/46) Headlamp Control Module (HCM) (4/118) (Applies up to and incl. structure week 201119) Central electronic module (CEM) (4/56) Transmission Control Module (TCM) (4/28) Differential electronic module (DEM) (4/82) Forward Sensing Module (FSM) (4/80) Driver information module (DIM) (5/1) Closing velocity module (CVM) (4/125)

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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.