E53 with no self-leveling suspension, but with LED on

[sv1cec]

OK, this is strange.

I have a 2005 X5 3.0 diesel which as far as I know, has no self-leveling suspension. At least I see no air suspension parts anywhere. However, the self-leveling suspension light on my dashboard came up yesterday. It pops on after I drive the car a short while and stays on, until I switch the car off. If I restart it, it stays off for a while and here it goes on again.

The car drives fine with no apparent change.

What could be the issue with this? I need to drive at least 300km before I can have the car checked and most of it will be through some very rough roads in Ukraine, so I need to know if this is something that I should worry about.

Any help will be greatly appreciated.