I noticed this for the first time yesterday, while trying to i.d. another noise. but mine is very faint. it seems like actuators or something going on and off. i dunno.

not enough to bother me, though.

unlike the high pitch wine over 70mph, which never bothered me either ( i BLAST my stereo most of the time) but the first time I had a passenger they asked " what the hell is that?!"

oh well . . . . .