BGM3 wrote Ah, I see. I triple checked all of the connections and they are correct. So it's either the FO splitter or the unit itself. I contacted Mr12Volt support.
Just wondering, what about the harness makes it so that you can't code CIC after it's installed? I've seen plenty of posts about the coding being done after the install.
There's a simpler method to allow you to root cause this, assuming the car was working correctly before hand.
Unplug the fiber optic connection on the mr12volt unit while the car is on. Do you see red light coming out of the cable? You should. If you don't, its not the unit. Assuming you don't, work your way backwards from the spliter. Is there light coming from fiber optic connection on the vehicle harness? There should be. Remember, MOST is a loop. Each device sends the signal to the next device in the loop. When the loop is broken, you just need to walk back to where you lose signal.
For the coding question, I think where this is possibly confusing some people is the previous mr12 volt boxes connected differently, by tapping into canbus at the idrive controller. People are able to code CIC with these versions installed.
The new oem microphone version uses a quadlock adapter with the cic unit quadlock plug. Something about connecting this way appears to break the ability to code the CIC unit.