[Dark Vader]

I just picked up my new-to-me 2010 535i (E60)

1. When I plug my phone into the AUX cable jack (3.5mm) I can't select "AUX" on my head unit... the screen button lights up and it looks like it's accepting the command, but it doesn't actually change... I can go from FM-AM-WB, but nothing happens when I click AUX... does the head unit aux ONLY work with USB jack? (I haven't tried connecting a USB cable to it yet) Is mine not functioning properly?

2 Does my sound system even HAVE the subwoofers under the seats?... I hear bass, and there are speaker grills under the seats, but the bass is so anemic and it doesn't sound like it's coming from under the seats (that's actually kind of a good thing) that I would swear that any bass I hear is coming from the rear deck speakers... there are tweeters in the A-pillars, SO I'm assuming it's the "HIFI" system... (tweeters and mids in the doors, mids in the rear deck and 200mm subs under the seats)

Is anemic bass the 'norm' for the factory system? I'm not looking for hair tricks, but I'm looking for more than I've got and I want it to go deep (25Hz)

Should I replace the ones under the seats, or should I just put a 10" in a ported box in the trunk...lol

3. is it hard to add a backup camera to the CCC system (I'm assuming it's the CCC from the bland interface)

How about Apple CarPlay?

there may be more questions but that's all for now

Thanks for the help in advance