2004 S 430 Cooling fan not on at slow speed

[Bzoo]

Hi I've done every kind of search and can't find
1. the location of the radiator fan relay(s) high and low,
2. any diagnostic thread for operating temp no cooling fan
a)higher temp high speed fan in operation
b)a/c on position cooling fan in operation

Any help would be great.

thanks

Bz