There is not a lighter in the socket.

Also the BSM seems to be tied in with all of these items. That's why I can't just remove it.

 

unplug each component that's on that circuit while watching the voltage, one at a time until you see the voltage drop. that should narrow it down a little more.

 

I saw your post on the parasitic power draw and BSM. I'm having the same issue. Did you ever get this solved?

 

I had a similar issue...power draw intermittently, after it was turned off. It was small enough to allow the batteries to last overnight and start, although rather sluggishly.
Eventually the problem turned into a continuous draw and that's when I noticed the dome light staying on continuously. Other symptoms had been happening off an on. For instance the alarm would trigger spuriously. And the speedometer would not return to zero. Then a bell would chime whenever I opened the door.
After replacing all the relays (passenger compartment fuse box, turn signal relay box and engine compartment fuse box) the dome light was still on. So, I eventually took it to the dealer and they diagnosed it as a bad gauge cluster and a bad timer spring (whatever that is). $1200 later, all the issues are resolved. Good news it I did not have to replace my security module or my dealer installed alarm, which now works as well.

Yeah.

So, I would recommend tracing it til you find the root cause, since doing otherwise is going to cost more...maybe a lot more. It took me over 4 years to pinpoint my issue....