Movement Sensor (IMS)

Fig 1: Identifying Movement Sensor (IMS)

Courtesy of VOLVO CARS CORPORATION

The movement sensor (IMS) uses ultrasound to detect movement inside the passenger compartment. The Doppler effect principle is used to determine if the received sound wave has a different phase compared to the transmitted sound wave. Any difference in phase is interpreted as movement in the vehicle. If a movement is detected, a trigger signal is sent to the central electronic module (CEM), which triggers the alarm.

The movement sensor (IMS) is located in the headlining in the center of the vehicle. This enables it to cover the greatest about of vehicle space possible.

NOTE:

XC60 with panorama roof has a Mass Movement Sensor Module (MMS) in addition to the movement sensor (IMS), which uses microwaves to primarily check the front part of the vehicle. The Mass Movement Sensor Module (MMS) is located in the tunnel console under the cup holder.

There are diagnostics for both movement sensors.