Nissan Primera P12 Intelligent Cruise Control

I would be very grateful for any advice or experience regarding adjusting the sensor of the intelligent cruise control.  The sensor on my T spec Primera is detecting large vehicles, such as lorries and vans, but not smaller ones like cars; I wonder if this means that the laser beam is set too high.

Thank you - I have checked the sensor is completely clean;   the Nissan instructions for adjusting the laser beam seem quite involved usiing special equipment;   I wondered if anyone with a similar problem had tried a simpler 'do-it-yourself' method;   so I am keen to hear of any more advice or experience.

Thanks for this advice too - the posts are interesting;  I'm still keen to know if anyone has experience of adjusting the direction of the sensor beam themselves - or is it best left to a Nissan garage? -  If I can find one which has still got the equipment and expertise!   Unlike some members, I think the intelligent cruise control is a very good feature and I want to get it woring right (on my previous Nissan, it worked fine for nine years).  

Don't know if this info will be of any use to you or not.

Thanks again to all who have replied to my question - your comments are helpful.   I can see this might be a job for Nissan, but my thinking was this:  if the beam alignment problem were just the vertical adjustment - which it might be because the system works with tall vehicles - could I not try the screwdriver half turn adjustment given in the manual to set the beam lower, without Consult II or the target board, and then road test the effect - if any;   if I keep a record of turns, I could put it back to its original position should that seem advisable.   Any views on this?