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 supplemental restraint system module (SRS) handles functions for:
- seat belt tensioners
- side impact sensors
- frontal collision sensors
- seat belt (inertia) reels (USA/CDN only)
- seat position sensors (USA/CDN only)
- adaptive seatbelt force limiter (USA/CDN only)
- side impact protection (SIPS) bags
- front airbags
- inflatable curtains
- SRS indication
- passenger airbag indication
- collision output signal
- collision registration
- adaptive steering column (USA/CDN only)
- front seat belt buckles
- local CAN network, supplemental restraint system module (SRS)
- occupant weight sensor (OWS) (USA/CDN only)
- switch on/off, front passenger airbag (not USA/CDN).
The control module is in the transmission tunnel, between the gear selector lever and the parking brake.
The supplemental restraint system module (SRS) communicates with directly connected components and with other control modules via the controller area network (CAN). Depending on the market, the control module can also communicate with components via a local CAN network.
The control module checks the input and output signals through an integrated diagnostic system. A diagnostic trouble code (DTC) is stored if the control module detects a fault.
Any diagnostic trouble codes (DTCs) are stored in the control module memory. The data can be read off using VIDA (Volvo scan tool).
The control module can process multiple collisions, frontal collisions, collisions from behind and side-on collisions.
The control module function can be easily checked by switching on the ignition. The SRS indicator lamp in the combined instrument panel must light up when the key is in ignition positions I-III. The lamp goes out after a short while if no faults are detected. This means that the supplemental restraint system (SRS) is functioning correctly.
For further information, also 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.