Mass Movement Sensor Module (MMS)

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2009 Volvo S60, 2008 Volvo S60, 2007 Volvo S60, 2006 Volvo S60, and 2005 Volvo S60. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Locating Mass Movement Sensor Module (MMS)

Courtesy of VOLVO CARS OF NORTH AMERICA.

The mass movement sensor module (MMS) detects movements inside the passenger compartment using high frequency radio waves. The Doppler effect principle is used to determine whether the frequency of the received microwave is different from the transmitted microwave. If the frequency has changed, this is interpreted as a movement in the vehicle. If a movement is detected, a trigger signal is transmitted to the upper electronic module (UEM) which activates the alarm.

Mass movement sensors (MMS) are located in the ceiling, in the center of the vehicle, to optimally cover as much as possible of the vehicle's volume.

The mass movement sensor module (MMS) is powered from the upper electronic module (UEM) and earthed in the body.

There are diagnostics for the mass movement sensor module (MMS).