View Full Version : wiring an aftermarket deck?

10-07-2008, 11:36 AM
ok so i took out the oem radio out of my e30 and was all psyched about installing the new deck i picked up...but realized that the wiring is all weird and it really makes no sense to me...i've done many searches and ppl just say it's easier to rewire the whole thing...

i'm against paying ppl to do shit for me if there's any chance i can do it myself...

keep in mind i'm not an electronics expert but i would like to try to do the rewiring myself.

anybody have any tips on doing this...or maybe even have a simpler way of hooking up the deck without rewiring?


10-07-2008, 11:52 AM
Its true you have to rewire, but its not that hard.

I have the wiring codes in my glove box I can grab them for you later.

Do you have the instructions for the wiring codes on your deck? I didn't made things take slightly longer.

10-07-2008, 12:27 PM
What I did:

-removed factory deck
-removed factory amp
-ran new wires to the front, connected behind the kick panels; easy
-ran the rear speaker wires from the new deck to four factory wires that go to the rear amp
-at the rear amp location, find those same four wires, cut them, and run new short lines to each rear speaker

Honestly, it is probably easier just to remove the trim panels along the pass door(s) and run two new wires into the rear area instead of my wire-saving technique.

If you have factory tweeters be careful, you might find that they are grounded on the neg side, in which case you'll need to rewire them inside the front door while you're at it.

Just take your time and remember that it's simply two wires to each speaker. Once you ignore all the other crap, running four doubled wires to each is easy.

10-07-2008, 12:34 PM
no i don't have the codes...

i'm gonna give it a shot tomorrow, i'm stuck in class all day today.

ill let u guys know how it goes, hopefully it's as easy as it sounds

10-07-2008, 12:40 PM

Most aftermarket radios uses the same colors as each other, but I'd google your deck and see if you can confirm them, otherwise, you'll be guessing forever.

10-07-2008, 01:39 PM

El Gato Liso
10-07-2008, 03:38 PM
you really dont have to rewire
i wired up using stock wires. but i reqwired in my other e30 cuz prev. owener butchered the shit out fo the wires.

you're only using the +front right and the + front left speaker wires.
thats it. besides power antennga and ground of course. the brown wire is ground. then white/blue stripe i think is antenna, and the solid blue and solid white wires are your speaker connecters for the +front right and the + front left of the harness

edit: i think im dead wrong with the wire colors. but i know im correct when i say install aftermarket harness only using +front right and the + front left speaker wires of the stock wiring. ASSUMING YOU GOT THE STOCK AMP INSTALLED STILL.

10-07-2008, 11:26 PM
What system do you have premium or not? If it is premium then there you go,
Yellow - Red/Green
Red - Violet/Gray
Black - Brown
Blue - White
Orange - Gray/Red

Following wires found at the fader:

Green - Yellow/Red
Green/Black - Yellow/Black
Purple - Blue/Red
Purple/Black - Blue/Black

Now, look in your trunk for the amplifier. Find these wires in the connector and connect them as shown:

(Note: There are two Black/Brown wires listed. They do not connect together. Connect them temporarily to test. If you have no sound out of your rear speakers, swap them and make your connection permanent.)

Black/Brown - Yellow/Red
Black/Violet - Yellow/Black
Black/White - Blue/Red
Black/Brown - Blue/Black

The front speakers. You need to run new wires to the front speakers from the headunit. (easier than rewiring the whole car, remember that) I will give you the wire colors at the back of the speakers to cut and connect to your new wire from the headunit.

White - Gray/Red
White/Black - Gray/Violet

Gray - Gray/White
Gray/Black - Gray/Brown

Info taken from e30tech.

10-08-2008, 12:26 PM
Unless you're putting in new speakers, subwoofer, amp, etc. I would probably just use the existing wires to hook up your head unit.

10-08-2008, 02:35 PM
^^ Nope, bad idea. If you have the factory amp, the wires won't work at all, and even if you don't, the fronts are partially grounded instead of floating ground.

10-12-2008, 03:03 AM
well i finally wired it and got it working...thanks for the help

10-13-2008, 09:48 PM
I had a similar situation in my 87 325is.

The part that made it easier for me was that it already had a deck but not an MP3-capable one so I installed my Eclipse I had lying around.

I only used 8 wires. Power, switched power, ground, amp/pwr antenna (to turn on the factory amp and my amp), and 4 speaker '+' wires. Didn't use the negative side of the speaker wires coming from the deck. It works but the speakers are a little shitty. I don't care, the thing is my winter beater/track toy so the radio and stuff is all going to come out in the spring anyway.