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.
Roll Over Protection (XC90 Only)
If the side tilt of the car exceeds 50 - 55 degrees, the supplemental restraint system module (SRS) starts calculating the strength of the rotational energy. If the sideways lean and rotational energy are high enough, the control module will activate the roll over protection. All seat belt tensioners in the car, front (8/33, 8/34), rear (8/55, 8/56, 8/62) and for the third row of seats (8/94, 8/95) (7 seater XC90 only) will be activated. The front (8/66, 8/67) and rear (8/96, 8/97 (7 seater XC90 only)) inflatable curtains will also be activated.
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:
- the central locking system is unlocked
- the fuel pump (FP) is switched off
- the interior lighting lights
- the hazard warning signal flashers are activated
- the collision pulse is registered
- an automatic alarm is sent to CSC (customer service center) if the vehicle is equipped with Volvo On Call (Plus).
A collision status signal is also sent to the phone module (PHM) and the central electronic module (CEM) via the controller area network (CAN).
Use the Manual With the Right Hardware
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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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