Roll Over

Fig 1: 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).