a lot of times, ya can hear the rattling of the pickguard, when being played, which is not a big deal at all.
But, if you're sure it's the pickups rattling, ya might wanna take it to a tech, just in case to see if anything is up with it.
def. not the pickguard, I use my bass without it. So the pickups shouldn't make any noise at all while unplugged and playing? it's quite subtle really, not exactly annoying and it doesn't really affect the sound when amplified... I'm just sort of curious haha if you know what I mean, since it's a recent acquisition. Plus I already had it checked buy a trusted tech and he found nothing at all.
here is a picture of my nice bass

