Mine is MY2006 also and doing the same thing. When I brake or turn it does the 'pop'. But not every time.

I think I have seen a SIB that tells to add a tightening washer under some bolt or nut under the seat. Unfortunately I have not found that document yet - need to search. If anyone has it it would be greatly appreciated.

I was able to recreate the sound or at least a similar sound by lifting the driver seat all the way up. Then stop lifting. Lift again (while it already is all the way up). Stop. Raise again etc. By repeating this every now and then you can hear the sound. Doing this on the passenger front seat is quiet and I cannot get the sound from that seat.

So maybe one of the motors under seat has loosen and can move a couple of millimeters. I think the plastic on the bottom side needs to be removed to expose what is making the sound. How is that removed?

My dealer is going to look at this within a month but I would like to give them some guidance since they will say that they cannot replicate it.

- p