System overview: Signals

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The chart below summarizes input and output signals to and from the power seat module (4/52). The signal types are divided into directly connected signals, serial communication and Control area network (CAN) communication. The illustration below displays the same information with the Volvo part numbers.

Input signals	Output signals
Directly connected:	Directly connected: (power supply unless otherwise stated)
Control panel (3/26) with:	Seat motors (6/16-19) (four)
Control buttons (eight input signals, two buttons) Memory button 1, 2 and 3 Programming button (MEM).	Voltage supply signal EXT.X
Hall sensors (four integrated in the seat motor)
Control circuit connected to the control panel

Via Control Area Network (CAN):	Via Control Area Network (CAN):
Central electronic module (4/56)	Passenger door module (3/126)
Upper electronic module (4/70)	Driver's door module (3/127)

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

Courtesy of VOLVO CARS OF NORTH AMERICA.