The level arms connected to the sensors may be oriented wrong. It can be installed in such a way that the linkage will not actuate the sensors.
Similar happened to me when I did airbags. Figured it out after taking it for a spin with actual values displayed on INPA and voltage output of level sensors were not changing even with suspension obviously working.
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04 X5 3.0i auto
03 X5 4.6is
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