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Old 02-13-2015, 12:01 PM   #1
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Join Date: Feb 2015
Location: Trnava
Posts: 1
My Ride: '04 318dT
E46 2004 Business CD AUX help

Hello everyone, I have a 2004 E46 318dT with an original Business CD head unit in it (with MODE button). The car did not have the 6 CD Changer upon my purchase, but there's also no wiring in the trunk for it, so maybe it wasn't there at all.

Due to inability to play MP3 CDs, the CDs getting stuck inside the radio from time to time and regular CD ERRORs, I decided to move along to AUX.

So I read a few DIYs and ordered a plug'n'play cable with two capacitators and one resistor on it. I've plugged it in the back of the radio on PINs 4 (-), 8 and 9 (L+, R+) and connected my iPhone to it, started playing music to test it, but MODE only switched between FM radio and NO DISC (no AUX).

As I was lead to believe, post-03/2002 head units models should support AUX. Giving it another shot, I tried a DIY cable without capacitators and resistor, connecting L+/R= to 8 and 9 and the ground cable to 4. There's still no AUX mode I could use. Just switches between CD and radio.

I'm including the scheme I've been using and a few photos of it. I will be thankful for any help.

Last edited by Saru; 02-13-2015 at 02:39 PM.
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Old 02-18-2015, 11:29 AM   #2
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Join Date: Oct 2014
Location: Northeast US
Posts: 24
My Ride: BMW 3er
I don't know if the head-unit in the 318dT is different from the one sold in United States (it shouldn't be in my opinion ) as long as it is manufactured after 09/2002. I purchased a OEM aux kit from ecstuning it's plug and play and works perfectly. http://www.ecstuning.com/BMW-E46-325...stem/ES194845/

Last edited by OCD+; 02-18-2015 at 11:30 AM.
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Old 02-22-2015, 12:19 AM   #3
SWO Daddy
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Join Date: Nov 2003
Location: San Diego
Posts: 574
My Ride: 11 Z4 35is / 02 330i
I refer you to this thread. Not sure if applies to non-US spec vehicles. http://forum.e46fanatics.com/showthr...722&highlight=
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