I apologize for the slight delay.
O.k.,it does sound like you have a battery drain/draw issue and this can be on the fiber optic side with one of the components in line causing this.I have seen the cd changer on some models cause this here as well as the radio/head unit as most common on the dash.With all of the electronics in this model here it is difficult to pinpoint the exact source of the draw/drain without the proper testing being done but these are most common for this fault.
The thing is,when you disconnect the fiber optic cables this wakes up the audio components and will cause a drain so this isnt the best check to do here.The best way I have found to locate the source of the draw is following this procedure below.A dealer can actually use their sds machine to locate which component is stuck on causing this as well but the procedure below is usually the best way to manually locate the draw/drain.You will need a multi meter to check this.If you do not have a multi meter to check this then this will need done by someone that does have this tool.
What needs done is to leave the key out of the vehicle with the windows rolled up and make sure everything is off with access to the battery.
Set the meter to amperage or milliamp and disconnect the negative cable from the battery.Put the leads in the multi meter the correct way (negative in negative and positive in the amperage or milliamp slot if equipped).
Connect one cable from the meter to the ground cable that was connected to the battery and the other lead to the ground terminal on the battery,this way the current is flowing through the multi meter.
After around 5 to 10 minutes see what the meter reads for a amperage draw.Normally you want to see less then 50 milliamp or less then .05 amp.
If you see over this amount of a battery draw/drain then your vehicle has an electrical component draining the battery.
From here you would remove one fuse at a time with the meter still in place and observe the reading on the meter until you come across one fuse that allows the draw to read below the 50 milliamp.This is the fuse or circuit that has the component on it that is drawing down the battery.Make sure when you remove one fuse if it is not the issue reinstall it and move to the next waiting a minute between each fuse removed to get an accurate reading.
Once you find the fuse or circuit its on then you would look on a wiring diagram to see what that fuse powers and unplug each of those components one at a time until you locate the component causing the draw then this component would need replaced.If you need help knowing what is on the fuses circuit once the fuse is located let me know.
I dont show the diagram of the fiber optic (MOST) ring on this model here and as above this isnt the best way to check this here.In order for a dealer or shop to see if one of the most ring components are at fault they usually have to disable it with their sds machine and use a fiber optic jumper to loop the ring together.
I would say the biggest one to cause a fault is the Tele-Aid/Mbrace control unit itself as I have had to replace several.
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