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.
Front-End Collision
In the event of a frontal collision, the sensors in the Supplemental restraint system module (SRS) (4/9) and frontal impact sensors (7/178 and 7/179) evaluate the mechanical stresses. The Supplemental restraint system module (SRS) determines which protection system is to be activated in the situation.
If the impact fulfils the conditions to activate the protection system the Supplemental restraint system module (SRS) sends an activation signal, a current pulse, to:
- front airbags (8/30, 8/31, 8/32 and 8/61) and/or
- seat belt tensioner (8/33, 8/34, 8/55 and 8/56) and/or
- the adaptive steering column (8/99) and/or
- the function for adaptive seatbelt force limiting.
The passenger airbag will not be deployed if it is deactivated using the Occupant weight sensor (OWS) (7/93).
A collision signal is transmitted on a direct connection from the supplemental restraint system module (SRS) to the central electronic module (CEM) (4/56) and phone module (PHM) (16/60) when the collision protection system is activated. These two control modules ensure that:
- switch off the fuel pump (FP)
- switch off the engine cooling fan (FC)
- switch off the windshield wipers when the car is stationary
- switch on the interior lighting and the courtesy lighting
- set the vehicle to collision status
- unlock the central locking system and
- if the vehicle is equipped with Volvo On Call (Plus), send an automatic alarm to CSC (Customer Service Center).
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.