System Overview

CONTROL MODULE

Courtesy of VOLVO CARS CORPORATION

The power seat module (PSM) handles the functions of integrated diagnostics. When the control module detects a fault, a diagnostic trouble code is generated in some cases.

Any diagnostic trouble codes are stored in the control module memory. The data can be read off using the diagnostic tool.

A way to check that the power seat module (PSM) (3/26) has a power supply and is grounded is to operate the seat.

The power seat module (PSM) is inoperable if voltage is below 8.5 V or exceeds 16.0 V. The control module becomes operable again when voltage increases to over 9.0 V or drops below 15.5 V.

For further information, also see the appropriate Signal specifications.

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)

Courtesy of VOLVO CARS CORPORATION