While browsing through the FSM, I think I've figured out the noise...and it's actually normal.
It's the ABS motor doing an operation check:
Quote:
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Originally Posted by 02 i35 fsm, BR-98
When starting the engine, or just after starting the vehicle,
the brake pedal may vibrate or the motor operating noise
may be heard from the engine compartment. This is a
normal status of the operation check.
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My old car used to have ABS take over a lot (in snow) and I'm just now realizing that's exactly the sound that I hear.
Maybe more experienced people can chime in on this thought?
6th gen reference where someone alluded to the ABS test since OP was hearing buzzing sound:
http://maxima.org/forums/6th-generat...ird-sound.html