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View Full Version : Amplifying Factory Nav Without Cutting Wires!


CWolfey
07-07-2007, 10:07 AM
I decided to dig deeper into the factory system my goal was to amplify the the inside speakers and possibly replace...but I didnt want to cut the wires going into the factory tuner/amp in the trunk I remember somone else making one but I thought this was a very easy simple solution!
So after I removed the liner to get to the amp I noticed the harness looked similar to the harness if it didnt have nav up front 70-9003 (metra). I would need both harness the male and female so that I could just pull out the speaker wires going into the amp and out to the speakers. the male plug is 71-9003

71-9003
http://www.installer.com/photos/71-9003.jpg
70-9003
http://www.installer.com/photos/70-9003.jpg

Here is the picture of the plug intact still in factory amp
http://www.cwolfey.com/Host/bmw1.jpg

The top plug that has all the speaker wires in it you will notice it can be removed, gently pry the clips on both sides and slide the plug out

http://www.cwolfey.com/Host/bmw3.jpg

http://www.cwolfey.com/Host/bmw4.jpg

http://www.cwolfey.com/Host/bmw5.jpg

Now do the same thing on the Metra harness 71-9003..that will be placed back into the factory hole you just opened up.

http://www.cwolfey.com/Host/bmw6.jpg

Connect the new factory plug with the wires coming out back into the factory amp, Then put the speaker plug that was removed from the factory amp plug into the slot where the speaker wires were removed from the 71-9003.
Now you take the 2 harnesses 70-9003 & 71-9003 and connect them together.

When you are all done you should have wires free coming from the amp which you will connect to a Hi Level RCA adapter
And wires free going out to the speakers which you will connect your amplfier outputs too.

I also pull out the extra wires that are not being used
and this is what you'll have when done

http://www.cwolfey.com/Host/bmw7.jpg

I will be installing today:
1 - PDX4.100, PDX1.600 & 4-SPR13S

http://www.cwolfey.com/Host/bmw8.jpg

RichardP
07-07-2007, 11:41 AM
I think you'll find that those are the outputs from the radio module which is in the trunk when Nav is installed, not the amp, and are diferential low level outputs not speaker outputs.

You should be able to plug them directly into the PDX-4.100 although it does not have a sub woofer amp output so that would not drive the 1.600.

CWolfey
07-07-2007, 12:19 PM
Not true...The wires that I am using are the Hi level outputs from the amp tuner box in trunk, I am using a Hi to low adapter to convert to RCA's.

Its all done already and It works perfectly...finally some power pushing the interior speakers.

RichardP
07-08-2007, 02:33 AM
I've not seen that combination before, but there are so many different variations of BMW radios/amplifiers etc.! Interesting to know anyway.

Those PDX amps are quite nice, pretty small and run relativly cool, even under the floor.

CWolfey
07-08-2007, 07:25 AM
Now the only problem is that the PDX1.600 isnt pushing the 2 10" type r Subs the way I wanted... I was hoping it would be close to the Rockford P8002, first I am gonna try another PDX1.600 for each sub if that doesnt do it I will have to put the P8002 back in just for the subs

DouglasABaker
07-25-2007, 07:07 PM
I've been looking for this for weeks!!!

Thanks CWolfey!!!!!!!!!

d-

CWolfey
07-26-2007, 06:14 AM
I beleive RICHARDP was somewhat correct... I ran into a slight problem!

I was able to use those output wires at the tuner module in the trunk with a Hi to lo converter as an input signal to the amp but

The problem I ran into was when I actually changed the speakers they were crossed over from somewhere else leading me to think there was another amp or crossovers..
I only didnt think I had an amp at all because I got the basic stereo system.

I found the amp behind the Drivers side rear speaker.. and it worked out great there because I took the input signal from that..which was the same wires in the trunk my amp was hooked up to and then I found the wires for each woofer and tweeter put my alpine crossovers in place of the amp.

Now the trick is fitting the Alpine 5 1/4" type R in the side panel for the rear...very shallow depth.

FYI the front factory speaker was 6 1/2" I made a plate to hold a 5 1/4" and the Alpine tweeter mounted perfectly in the factory location.

Technic
07-26-2007, 09:25 AM
I beleive RICHARDP was somewhat correct... I ran into a slight problem!

I was able to use those output wires at the tuner module in the trunk with a Hi to lo converter as an input signal to the amp but

The problem I ran into was when I actually changed the speakers they were crossed over from somewhere else leading me to think there was another amp or crossovers..
I only didnt think I had an amp at all because I got the basic stereo system.

I found the amp behind the Drivers side rear speaker.. and it worked out great there because I took the input signal from that..which was the same wires in the trunk my amp was hooked up to and then I found the wires for each woofer and tweeter put my alpine crossovers in place of the amp.

Now the trick is fitting the Alpine 5 1/4" type R in the side panel for the rear...very shallow depth.

FYI the front factory speaker was 6 1/2" I made a plate to hold a 5 1/4" and the Alpine tweeter mounted perfectly in the factory location.

Although it was a great idea of combining those aftermarket connectors to add an amp to the Nav tuner, the OEM amp was still there in the way with its built in crossovers killing the Alpine outputs, as you ultimately found out. All USA E46 audio systems are externally amplified, but the convertible amp location is the trickiest one (as you found out also).

One solution to replace the OEM amp (be in a Nav or non-Nav E46) with aftermarket without cutting any OEM wires or connectors is to use the same or an used/shot OEM amp and remove its main connector from its casing. Once this connector is out, all the inputs and outputs will be available right there for custom interface:

http://photos.e46fanatics.com/data/500/Harness_OEM.JPG

Once everything is properly identified and connected it is just a matter of plugging this custom harness to the OEM amp connector in the car and that's it... immediate connection to all individual speakers in the car thru the OEM wiring. :thumbup: