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I saw on another web-site that stated the blue was (-) and the yellow was (+). This was for the front doors. Not sure about the rear. Hope this helps.
go to www.modifiedlife.com.it has izuzu radio schematics for most years and models of isuzus.
http://www.installer.com/cars/chevrolet.html
You can find the 2005 Ford Ranger radio CD player wire color codes in most service manuals. The wire colors are associated as follows; the positive wire is red, the black wire is the ground, the green and yellow wires are speaker wires, and the white wire is the auxiliary wire.
For the 1998 BMW 318ti, the radio battery constant 12-volt + wire colors are red and white. The 12-volt radio accessory wire colors are purple and white. The ground wire is brown and the antenna trigger wire is white.
The red wire is the positive wire. The black wire is the ground wire. The green wire is the speaker wire. The white wire is the auxiliary wire.
follow the link for your wiring codes
The wiring colors for a 1997 Cadillac Deville radio with an amplifier are easy to identify. The radio battery constant 12v+ wire is orange, the radio accessory switched 12v+ wire is yellow, the radio ground wire is black, the radio illumination wire is gray, the dimmer wire is brown, and the antenna trigger wire is pink. For the front speakers, the left front speaker wire (+) is tan, the left front speaker wire (-) is gray, the right front speaker wire (+) is light green, and the right front speaker wire (-) is dark green. For the rear speakers, the left rear speaker wire (+) is brown, the left rear speaker wire (-) is yellow, the right rear speaker wire (+) is dark blue, and the right rear speaker wire (-) is light blue.
The wire colors can be found at www.modifiedlife.com
they represent the fact thet your an idiot
is the orange wire always hot
radio diagramobtain a factory Honda service manual and it will be in there with wire colors. www.ahdol.com will also have wire diagrams for the vehicle for 11.99 Helms and Chilton manual may have them also