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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 11-08-2015, 02:53 PM   #1
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Join Date: Nov 2015
Location: London
Posts: 3
My Ride: 318 Ci
MP3 Aux Input Mystery - Please help!!

Hi everyone,

I'm new to E46 (2004 318 Ci) ownership but have spent hours trawling the forums to find an answer - apologies if it's an obvious one to you experienced guys!

I bought a 3.5mm aux input cable kit (see here), and installed it into the spare aux input on the back of my Business CD Head Unit (see picture that I've nicked for clarity):

Anyway, I installed the cable (which literally connects that spare socket on the back of the H/U to the female aux socket now mounted in the ashtray), but then when I cycle through the modes, no AUX mode is displayed.

It's a newer model than the '02 date everyone talks about, and has the spare socket on the rear - why can't I get it to accept the aux feed?

Any help very gratefully received! I'll hopefully be able to contribute back one day!

Cheers all._a_
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Old 11-09-2015, 08:43 AM   #2
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Join Date: Jul 2008
Location: USA
Posts: 5,517
My Ride: 2001 330Ci
Pull the head unit and report the BMW part #.

From what vendor did you buy the aux kit? Is it design for your head unit specifically? What brand is it?
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Old 11-10-2015, 07:10 AM   #3
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Join Date: Nov 2015
Location: London
Posts: 3
My Ride: 318 Ci
Hey markusmarkus,
Thanks for getting back to me - I had to leave the car at home (I'm now at university) since it went into limp home mode and needs some attention, so I can't get the H/U out. Apparently the Valvetronic / VVT unit is dodgy and the cranckcase vent also looks like it's blocked. So a bit of pain to come before I can start thinking about aux inputs again!

Thanks for your help - much appreciated.
Happy E46ing
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aux, mp3

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