i purposely disconnect mine because the dog steps on it when I leave her in the car. You can get to it easily if you pull up the leather boot around the gear shift (there is a plastic frame that is held on with pressure- kinda pull in the sides and lift up), push your hand in to push up the switch from underneath. Might be worth making sure the connection didn't come loose.

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2004, X5, 3.0, 202k+