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.
System Overview: Signals
The table below summarizes the input signals to and output signals from the power seat module, left (PSL) (3/26) and power seat module, right (PSR) (3/27). The signal types are divided into directly connected signals and CAN communication. The illustration below (Fig 1) displays the same information with the Volvo component designations.
| Input signals | Output signals |
| Directly connected: | Directly connected: (power supply unless otherwise stated) |
|
|
| Via Controller Area Network (CAN) communication: | Via Controller Area Network (CAN) communication: |
|
|
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.