The GMOS-LAN-01 manual states under 16 pin harness:
Connect the Orange/White wire to the illumination wire of the aftermarket radio. If the aftermarket radio has no illumination wire just tape off the Orange/White wire.
I will have to consult Kreskin or a swami to give any further help until there would be easily accessible info to what car, year, model, amplified, non-amplified, interfaces or harnesses, etc...

I jest a little, it is tough for me to understand because I have not even pulled my radio out yet and have no real idea.
This is a link to another thread that has some wire diagram info:
viewtopic.php?f=18&t=25185&p=454257&hil ... ce#p454257" onclick="window.open(this.href);return false;
Thanks to audiovibe:
...."09-10Vibes only
Audio/Mobile Video
Illumination GREEN (+) RADIO HARNESS
03-08 Vibes
Audio/Mobile Video
IlluminationGREEN(+)RADIO HARNESS
DimmerWHITE/BLACK(-)RADIO HARNESS"...
2010 Vibe 1.8 auto, fwd, base, air, preferred package, cargo mgt, cargo cover, ultra white.