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.
Control Module
The power seat module, left (PSL) and power seat module, right (PSR) manage the functions for:
- seat operation
- storage of memory positions (seat positions only).
The control modules are located on the outside of the front seats and are integrated in the control panel. The side panels must be detached to replace the control modules.
The power seat module, left (PSL) and power seat module, right (PSR) communicate with both directly connected components and with other control modules via CAN communication.
The control modules check carried out activations and input and output signals via an integrated diagnostic system. A diagnostic trouble code (DTC) is stored in certain cases if the control modules detect a fault.
Any diagnostic trouble codes (DTCs) are stored in the control modules memory. The data can be read off using VIDA (Volvo scan tool).
A simple way to check that the power seat module, left (PSL) and power seat module, right (PSR) are supplied with power and grounded is to move the seat.
If the voltage is below 8.5 V or above 16.0 V, the power seat module, left (PSL) and power seat module, right (PSR) will not function. If the voltage increases to above 9.0 V or falls below 15.5 V, the control module will function again.
For further information, see SIGNALS .
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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.
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