Fig 1: Identifying SRS System Communication

Courtesy of VOLVO CARS CORPORATION

In the event of a roll over, the sensors, mounted in the Supplemental restraint system module (SRS) (4/9), evaluate the angle of the vehicle and how quickly the vehicle angle will change. When the movement has exceeded the predetermined limit, the following components are activated:

door mounted inflatable curtains (8/66 and 8/67)
seat belt tensioners (8/33, 8/34, 8/55 and 8/56)
roll-over bar cassettes (8/57 and 8/58).

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).

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.

Safety Warning

Roll Over

Use the Manual With the Right Hardware

When to See a Mechanic

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