Hazzard light switch & sidelight conundrum

[justandy]

Anybody know why the hazzard light switch stays illuminated for half an hour after doors locked on my 04 A3 SE.

Also changing the sidelights to LED ones causes the rain sensor to fail????

 

[a4sline]

Hazzard light switch stays lit because the can bus systems take this long to shut down.
Perfectly normal ole chap.
HTH