I just ran across function descriptions for an E70 FRM2 and the following is listed as 'Check Control - Lights Left On Warning':
I double checked and I don't have it in my FRM but I found it in a backup of my buddy's FRM2. Then I checked my files and found the following:
I think that might be it. I'll try it later tonight and post back here.
Link to FRM2 translation and allowed values