Ultrasonic Sensor Module (IMS) (Only XC90 My 2012-)

Fig 1: Identifying Ultrasonic Sensor Module (IMS)

Courtesy of VOLVO CARS CORPORATION

The ultrasonic sensor module (IMS) is located in a cover in the ceiling. The ultrasonic sensor module (IMS) is used to detect movements inside the passenger compartment when the alarm has been activated. The aim is to detect anyone trying to reach in and steal a bag or similar or example. When the sensor is activated, an internal self test is performed and informs the Central electronic module (CEM) of the result. If the test failed the Central electronic module (CEM) stores a DTC. The sensors communicate serially and are powered via the Upper electronic module (UEM). When the sensor is activated it transmits ultrasound inside the passenger compartment. The sound waves reflect back to the sensor and if the sensor detects a change in reflections or movements in the passenger compartment, the alarm is tripped.