DIY: Aux input added to my pre 2003 M5 for Iphone - BMW M5 Forum and M6 Forums

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Old 21st October 2011, 12:39   #1
Bilal@storm
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Aux input added to my pre 2003 M5 for Iphone

So i've been reading up various threads on how to add an aux input to the pre 2003 factory system by hacking into the tape deck outputs. Here's my write up:

With the Sat Nav removed (remove plastic surrounding trim then 4 small screws - 2 in the top and 2 in the bottom) you can see the 2 harnesses plugged into the back:



The blue one is the one we are interested in since it has the audio outputs and power feeds. The photo below shows the 2 pairs of twisted wires - yellow and blue which are the audio outputs from the Tape Deck. The Yellow is the Right channel and the Blue is the Left Channel.



To remove any interference from the tape deck itself I cut the output wires completely and attached them to RCA cables:



Now the output of my Iphone needs a boost to enable the sound level to be similar to the radio and CD changer - so I used a Line Driver. The sequence is:

Iphone------Line Driver------Tape Deck Outputs

In order to power the Line Driver I spliced into the power and ground on the blue harness:



The Red wire with green trace is the permanent live and the purple wire is the switched live (only turns live with ignition) which goes to the remote input on the driver. The Ground is the brown wire.

With the line Driver wired in I used a Headphone jack to RCA cable to feed it from the Iphone:



The driver gain was then turned up to almost maximum and then tucked away inside the sat nav cavity. I routed the aux cable through the cup holder and left it long enough so that I could comfortably control the iphone:



With everything ready it was time to test the sound. I used a normal tape in the deck to fool the system - I didn't bother with a dummy tape as I had cut the output from the deck anyway.

The sound was pretty good - volume level was very close to the radio and CD changer and it had good bass and treble tones. I found the best sound was with the Iphone EQ settings turned off - or flat.

Out of curiosity I also had an AV cable which plugged into the base of the iphone. So using the RCA audio outputs of the cable into the line driver - i tried this method. However I found that this produced a more muffled sound where the treble tones seemed to be lacking. This could be because I was using a cheapo cable? Anyway - I reverted to the headphone output of the iphone and I have to say I am pleased with the performance.
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Old 21st October 2011, 14:07   #2
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Nice detailed write up...thanks for sharing. I just might give this a try.
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Old 23rd March 2013, 07:35   #3
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Thanks for this writeup. There is a definite lack of information on the pre-2003 aux installation on this site (other than this thread).

I do still have a few questions, though, before I'm comfortable tackling this project:

(1) You show the red and purple live wires in one pic, but the next pic has three red lines going to a connector at the line drive end. What is this connector? Are the three red lines attached to the red/purple/brown stock wires?

(2) What did you do with the remaining wires from the blue connector? It looks like there are a few unused wires - do you leave those intact? Then what about the free ends sticking out from the connector.

(3) When you have the nav unit off, do you have access to the area around the cupholders? I'd like to install an aux input (female connection rather than male) in the area to the side of the cupholders.

(4) Any recommendations on line drivers that fit and work well?
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Old 23rd March 2013, 17:46   #4
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Quote:
Originally Posted by Armonster View Post
Thanks for this writeup. There is a definite lack of information on the pre-2003 aux installation on this site (other than this thread).
Look at the 'DIY Sticky' for more information for for pre 2003.
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Old 25th March 2013, 05:48   #5
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There is a much easier DIY for 2003 aux input that I did which is a BMW part. It is plug and play without the use of RCA's.
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Old 27th March 2013, 06:03   #6
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Quote:
Originally Posted by graffix000 View Post
There is a much easier DIY for 2003 aux input that I did which is a BMW part. It is plug and play without the use of RCA's.
Right. This thread is about PRE 2003 cars.

Now who's got some answers to my questions up there?
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Old 27th March 2013, 16:17   #7
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I believe this is closer to what you're looking for;

00 With 16:9 NAV Aux Question

what is the difference between C43 and B53

DIY: Make your own Aux input cable with install

I searched for "aux" and these came up. Whether or not you have aux input doesn't seem to be based on year but model of your radio etc.
I'll be doing this mod very soon.

That help?
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Old 10th April 2013, 06:09   #8
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I've got an 01 with M-Audio and do NOT have that purple wire. All my wires are constant 12v...where in the world do I look for a switched +12?
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Old 7th August 2013, 18:28   #9
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I have started this DIY but I don't have the purple wire for the switched power source. Any updates on this?
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Old 14th October 2013, 20:29   #10
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purple wire

heyyyyyyyy has anybody figured out the purple wire issue? I've got everything else ready to go, just need to know how to power the line driver...
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