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you can disable the sensor with the button is on the key fob near the base with 'off' written on it. When you leave the car and lock it in the normal way you have to press the 'disable' button within 20 seconds and the indicators should flash 3 times and the motion sensor is then disabled
OK thanks for the extra information
In that case sorry to say that I don't think that you have an option to disable the motion sensor without dealer software intervention - obviously this isn't much help if you're already on the Ferry
however what usually works on a lot of other cars is to remove the emergency mechanical key from the fob ( there's a button to push and so withdraw the key blade) and lock the car with this key
this should lock the car but not set the alarm
however I should say that I've not tried this on your car