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 - 4 OF 5POWER SEAT MODULE (PSM)SYSTEM OVERVIEWSIGNALS

2009 Volvo XC70 Base

System Overview: Signals

2009 Volvo XC70 BaseSECTION Signals

The table below summarizes the input signals to and output signals from the power seat module (PSM) (3/26). The signal types are divided into directly connected signals and CAN communication. The illustration below depicts the same information with Volvo component designations.

Input signals	Output signals
Directly connected:	Directly connected: (supply voltage unless otherwise specified)
Hall sensor (x 4, integrated in the seat motors)	Seat motors (6/16, 6/17, 6/18, 6/19)
Via CAN communication:	Via CAN communication:
Central electronic module (CEM) (4/56) Driver information module (DIM) (5/1) Driver door module (DDM) (3/126) Brake control module (BCM) (4/16)	Driver door module (DDM) (3/126) Passenger door module (PDM) (3/127) Central electronic module (CEM) (4/56) Driver information module (DIM) (5/1)

Fig 1: Identifying Input Signals To And Output Signals From Power Seat Module (PSM)

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.