Speaker wire not colour coded

Following are colour codes for your radio curtesy of;
Source(s): GM dealer tech over 30 years. HyperGforce

Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Brown
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue
The solid wire (casing) would enclose a number of thinner wires that may or may not include these colour codes.
You have to match up the wires and their functions in your new radio with these colour coded wires, have fun..........

Safer to REWIRE SUB Or Speaker With you own Wire then YOU Determin POS and Ground

Firstly make sure you have connected the speakers to the main system in an proper order. Certain system's have the name of the speaker's mentioned at every output line which is at the rear of the system. If you would connect the wrong wires then it eventually would not play the sound. once this is done make sure that the wires of each speakers are split into two at both the ends. They are normally coded in red and black colours at the tip of the wire. Check if the red of the wire is connected to the red of the system and so on for all the speakers. So try removing all your connections and do it all over in a proper way.

I am assuming this is the message that shows up from your receivers front display panel? It could be the receiver is telling you that you may have the neg & pos. wires crossed and in the opposite position either in back of the receiver speaker posts, or in back of the speaker terminals themselves. My Yamaha receiver has this nice feature where it will tell you when the speakers are "Out Of Phase" which describes the problem I have described here.

Just go back and make sure your wires are hooked up correctly, and use tape and a Marker to label pos. and neg so they will be easier to hook up next time you have to move the system, or decide to change some aspect of your system. I would then take the time to label every wire that goes to each speaker that you plug into the back of your receiver. This a BIG time saver........

Car Radio Constant 12v+ Wire: Blue/Yellow
Car Radio Switched 12v+ Wire: Gray
Car Radio Ground Wire: Brown
Car Radio Illumination Wire: Green
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Pink
Left Front Speaker Negative Wire (-): Violet
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Blue
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Black
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Red
Right Rear Speaker Negative Wire (-): White

Yes you can splice the ends onto the existing wires, but first make sure the ends are labeled + or - and make sure you hook the other ends to the speakers the correct way. Before you cut the connectors off of the speaker wires mark one of each of the pairs of the wires with tape, on each side of where you cut it so you can match the wires back up. Are the pre-wired, wires labeled + and -? or red and black? Or one of each pair is a different color wire ie silver and copper? If they aren't labeled its going to be hard to get the correct polarity (+ and -) for each speaker. I hope this helps post back if you have any problems.

this is what I show for Passat.
Car Radio Constant 12V+ Wire: Red/White
Car Radio Ignition Switched 12V+ Wire: Orange
Car Radio Ground Wire: Brown
Car Stereo Illumination Wire: Gray/Blue
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amplifier Trigger Wire: N/A
Front Speakers Size: 6 1/2′
Front Speakers Location: Doors
Left Front Speaker Wire (+): Blue/Black
Left Front Speaker Wire (-): Orange/Black
Right Front Speaker Wire (+): Red/White
Right Front Speaker Wire (-): Orange/White
Rear Speakers Size: 6 1/2′
Rear Speakers Location: Rear Door
Left Rear Speaker Wire (+): Red/Light Green
Left Rear Speaker Wire (-): Orange/Black
Right Rear Speaker Wire (+): Blue/Light Green
Right Rear Speaker Wire (-): Orange/Red

Sure you can, Joel.

Put the speakers wherever they will go, and cut the wire from the speaker to whatever length you need to reach your wall terminals. Leave some slack so you can move the speakers if needed. Strip off whatever length of insulation you need to make the terminal connection. Note that the speaker wire will have some kind of polarity marking. There will be a colored stripe or other mark on the insulation, or the conductors themselves may be different colors (usually one wire is copper, and the other tinned so it's silver colored). It doesn't matter which you use for positive as long as you're consistent and use the same one for each speaker.

At the other end where the prewiring comes out for your home-theater system, splice the connector ends you cut off onto the installed wires, following the same polarity. I recommend using an appropriate size insulated **** splice to make the connection. The crimper and splices can be found at auto parts stores, Radio Shack or most hardware stores. It's quick, reliable and makes sure there are no bare wires to short out.

Plug the speakers into the system and you should be good to go. Whip up some popcorn and enjoy the show!

Here are the radio wire colors of the whole system, please rate this solution.

2007 Pontiac G6 Car Radio Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Red/White
Car Radio Accessory Switched 12v+ Wire: The radio harness does not provide a switched power source. Run a wire to the fusebox for switched power or use the brown wire (+) at the ignition wire harness.
Car Radio Ground Wire: Black/White
Car Radio Illumination Wire: Pink
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue

work it out with a meter ,,,,find perm 12v feed neg and pos ---yes could be any coloured wire depending on car maker,after finding perm 12v feed for memory look for pos from ign switch,now speaker wires are easy as both will be same colour for a speaker but one will have a band through it if not sure or colour blind like yours truelly then use pos and neg on speaker wire till you hear a thump from speaker then you know you have the right wires and location of speaker ,,ie.. front left back right ect ....Now you are a fully experianced radio fitter ??