installing head unit W123 - PeachParts Mercedes-Benz Forum

TheDon · #1 06-04-2006, 01:54 PM

i bought a head unit today
its a sony CDX-GT10W i have the plug for the cd player and the wires off it

here are what the wires go to

White-speaker left posative
White/black stripe left negative -------these two connect to what in the chasis

Gray right speaker posative
Gray/black stripe negative-----these two connect to what in the chasis

Green left rear posative
Green/black stripe left rear negative-----these two connecto to what in the chasis

Purple right rear posative
Pureple/black striple right rear negative---these two connect to what in the chasis

Solid black(appears to be the ground.. where should i fasten this to)

Blue- this is for the antena

then a red and yellow that arent labled

iwrock · #2 06-04-2006, 03:17 PM

I am pretty sure that the yellow wire is ignition, and red is memory.

Blue is your antenna wire/amp turn on lead.

iwrock · #3 06-04-2006, 03:23 PM

I dont use the ground wire. The antenna connector usually grounds the headunit for me. I only use the groundwire if there is no antenna connection.

TheDon · #4 06-04-2006, 03:24 PM

Quote:

Originally Posted by justinwrock

I am pretty sure that the yellow wire is ignition, and red is memory.

i was just reading the instruction manual and it says

" to a metal surface on the car
first connect the black ground lead, then connect the yellow and red power input leads"

iwrock · #5 06-04-2006, 03:39 PM

Quote:

Originally Posted by TheDon

i was just reading the instruction manual and it says

" to a metal surface on the car
first connect the black ground lead, then connect the yellow and red power input leads"

Exactly. Connect your antenna lead (the big black antenna wire) to the antenna socket on your deck, and then connect the red wire to your memory wire, and then the yellow wire to your constant 12 volt wire.

iwrock · #6 06-04-2006, 03:42 PM

The brown wire is ground.
The black and yellow wire is your ignition/switched 12 volt lead.
The solid red wire is your constant 12v wire.

Let me see if I can pull the wiring diagram for your car.

TheDon · #7 06-04-2006, 03:50 PM

awesome.. i just need to figure which ( red/yellow) is the constant and which is the switched.. and wire strippers.

iwrock · #8 06-04-2006, 03:57 PM

Yellow wires on the back of atermarket HU's are switched (ignition).
Red is constant 12 volt.

So, the brown wire from chassis goes to black wire (I dont do this)
The black/yellow wire from chassis goes into the yellow wire of HU.
The Red wire from chassis goes into the red wire of HU. I am still looking for a wiring diagram.

iwrock · #9 06-04-2006, 03:59 PM

TheDon, do you still have the aftermarket HU the PO left in there? If so, you can just use the exisiting colors to guide you.

TheDon · #10 06-04-2006, 04:01 PM

Quote:

Originally Posted by justinwrock

TheDon, do you still have the aftermarket HU the PO left in there? If so, you can just use the exisiting colors to guide you.

nope they took it along with the wires with it

also.. disconnecting the battery is good yes?

there is no black yellow wire.. here is what i have

black w/ green
black stuck to that one

black w/ red
black stuck to that one
(those 4 wires are on a seperate loom)

then 4 wires leading to a male plug

red,black,brown,grey

iwrock · #11 06-04-2006, 04:45 PM

Ok, that first loom is your speaker harness. I am almost positive.

Hmmm, that second harness.

Do you have a voltmeter??

If you do, take the brown wire and connect it to the black connector on the voltmeter, and take the red wire on the voltmeter, and check to see what wire has +12 when car is off, and which one recieves +12 when you turn ignition.
And when I do stereos, I usually pull the (-) negative terminal off.

TheDon · #12 06-04-2006, 04:56 PM

well i connected red to red black to yellow.. turned the car to ACC and huzah! i know its 1:00 am blinking.. now to do the speakers.. ill put the left and right front to the ones MB has given me and the same for rear.. i need some sound when i drive

iwrock · #13 06-04-2006, 04:58 PM

Here are the wiring colors.

BROWN WIRE....ground (-)
BLACK WIRE....ignition 12V (+)
GRAY WIRE ....illumination 12V (+)
RED WIRE .....constant 12V (+)

iwrock · #14 06-04-2006, 05:03 PM

For wiring the speakers, I just bypassed all the stock wiring, and put new amps in. I run an amp for the front speakers, and an amp for the rears. Gives me awesome sound.

TheDon · #15 06-04-2006, 05:24 PM

Quote:

Originally Posted by justinwrock

For wiring the speakers, I just bypassed all the stock wiring, and put new amps in. I run an amp for the front speakers, and an amp for the rears. Gives me awesome sound.

yea... well im stuck for now

ok here is what happened

i have power to the cd player.. i wired the ground to the brown wire for the hell of it.. i put a cd in.. it plays 3 seconds of a song.. i can hear it in the back but not the front then the CD player shuts off and turns back on

i have the front posatives running to a wire that is red and black.. the negative of those 2 running to a black wire that is with the red and black one

likewise for the rear out of the cd player but to a green with black and black.. i get some sound out of the rear.

-update-

ok if i take the white wires p/n and any other one like purple p/n and attach them to the green/black ..red/black wire set i only get sound out of the rear.. is the crossfader causing me to have problems? if so ill just go get some speaker wire and rewire the whole sob.. white positive to left front speaker positive.. white negative to left speaker negative

--update number 2---

it appears that all 4 speakers in the car have green wblack stripe and black wires leading to them...wtf