Owners can check with the manufacturer of a car stereo to find the exact color codes. Owners can also find guides to stereo color codes online. Some websites that offer guides are CarStereo.com and InstallDr.com.
Color codes vary between OEM and aftermarket stereos. OEM, or original equipment manufacturer, stereos use codes set by the manufacturer, while aftermarket stereos use a set of standardized generic codes. Some generic color codes are yellow for 12-volt constant or memory cables, red for switches and accessories and blue for antenna remotes. Other generic codes include gray for front speaker wires and purple for rear speaker wires.