Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Ultrasonic Sensor Module (IMS) (Only XC90 My 2012-)
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.
The sensor's performance is affected by air turbulence and therefore all windows and any roof hatches must be closed for the sensor to work optimally.
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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.