In 2001 an actual wiring for that light was changed from direct feed from battery to a feed from relay R71 (or R72, it doesn't matter), and supposedly would be a good indicator for car gone into sleep. But it was proven in this forum that info can be misleading... so, there is no definite answer.

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E53 X5 4.6iS
147K mi - Sold May 2013
Tireprints left in:
USA, Nicaragua, Costa Rica, Panama, Russia

E53 X5 4.8iS built 2005-10-17
66200 mi - June 2012
96000 mi - June 2013
112000 mi - June 2014
OEM fire extinguisher
OE first aid kit
OE tow hitch
OE TV module
OE aspheric mirror
K&N air filter
black/white badges
rear camera
4-channel video recorder

Here is the list of things I have done to the X