I had a Euro W140 with daytime running lights and when you shut
off the engine, the DRL relay kept the headlamps on for a second or two. that caused the headlight reminder in the cluster to beep
2 or 3 times before the relay shut the headlights off.
I have also seen this on several Canadian w140's with DRL's
as well.

Damn Sony's! they get you every time.
DR.D