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so I've installed a sub and amp into my trunk of my 06 m5 and have taken the speaker signal out of the two rear speakers. The problem I have now is it seems only to pick up mid bass. My stock speaker system has the subs installed under the rear seats which leads me to believe that the signals are filtered so that the low bass signal would only be sent to the stock subs. I was going to use their signal at first but the passenger side had about 6 or seven wires coming from it and I have no idea how to tell what is what. I guess my question is ;
Has anybody put an aftermarket sub onto the oem system and used the signal from the stock subs?
Or;
Does anyone know where I might find a wiring diagram for the audio system?
Any help would be so greatly appreciated!
 

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Stealing "dbpack" post from this thread
http://www.bimmerfest.com/forums/showthread.php?t=338776

Read the whole thread above and this specific post below to get a better understanding.

"Okay, first thing you need to do is empty out your trunk for easy access. Next, remove both side panels inside the trunk. Just turn the black plugs 90 degrees and they pop out. This will give you access to the battery on the right, and the factory amp on the left side.

So, first disconnect the battery so you don't shock yourself. Find the amp on the left side of the car. It's a silver box with a bundle of wires going into it...fairly easy to find. Remove the bundle of wires from the amp. There's a little sliding thing to disconnect the bundle...it's easy to figure out once you see it.
Here's the wires coming directly from the head unit that you'll want to tap to grab your signal from:

Left + Black/Red
Left - Black/Violet
Right + Black/White
Right - Black/Brown
On/Off White/Violet

I had to cut the black fabric tape that was wrapping the wires so I could access them. Just tap those wires and you should be good to go. You shouldn't need an LOC. To control the power to your amp, tap the thin White/Violet wire and connect directly to your amp. This will ensure your amp turns on/off when the car goes in and out of sleep mode (just like the factory amp). Make sure you do a good clean job tapping into the wires...they will still need to feed a signal into the factory amp so the rest of the speakers make sound

Plug the bundle of wires back into the factory amp and you're done grabbing a stereo signal.

Most people seem to mount the amp either hanging under the rear deck, or on the flat part of the left-side panel (the one that covers the factory amp...this is what I did). I've also read that some people that have smaller sized amps were able to fit them UNDER the panel so they stay stealth...if you do this make sure you take cooling into consideration. Also, the back of the rear seats is another option (this is what I did on my e46).

That's about it, running power to the amp is pretty easy since the battery is already back there. You should be able to figure the rest out. BTW, I did this install on my '05 530i, no nav, standard audio (not logic 7).

Hope that helps."
 

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Contact member technic , he sells a harness that plugs into the factory harness , so u dont have to cut into the factory wires, I found out about that too late and tapped into my factory wires , so wish I woulda found that out sooner
 
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