Radio help!

[FRITZ_e30]

Hey guys! I am new to this forum, but familiar with how they work (long time bimmerforums guy). I just recently purchased a 92 318ic, and am doing the regular maintenance on it.  I found this nice aftermarket stereo lying around that i had and decided to put it it, and the wiring is like nothing that I have ever seen before.  I will put up some pictures, and hopefully you guys can help me! Thanks in advance!

[DesktopDave]

Do you have the ETM?  If not, download it from here, sections 6500 have the wiring colors.  I think your car will be loaded up with the upgraded BMW Premium system, so your wiring will be a bit different than most cars here...  I'm lucky my car even had a stereo, LOL.

IIRC you'll have only five speaker wires - the four normal channels with a single common ground to the crossover/amp in the trunk.  Then you'll have the usual power, acc, ground, amp power, brightness and power antenna wires.

Be aware that you'll likely have to wire the aftermarket stereo's "memory/battery/acc." wire directly off the battery or some other good unswitched power source.  I pulled mine off the hot lead (thick red wire?) in the hazard light switch.  Newer head units tend to run off the battery wire, not the switched wire like the OEM BMW head unit did.

[deansweet]

Harness for radio colors:
Red = Switched Power +12v
Yellow = Constant Power -12v
Black = Ground
Blue = Remote power for amp or power antenna.
White = Front Left +
White/Black = Front Left -
Gray = Front Right +
Gray/Black = Front Right -
Green = Rear Left +
Green/Black = Rear Left -
Purple = Rear right +
Purple/Black = Rear Right -