I'm at work right now.. and I have all of my publications at home... when I get there.. I will look this one up for you.. If I remember correctly there is a time delay relay.. so when your car is a certain temp.. it stays on for a schedualed about of time...
I'll get back to you later.. PM me to remind me if you like... or you might want to do that...
1997 E36 M3 1990 E30 325i