I believe that it is the same relay as the defrost & it is housed in the fuse box. It is the black relay all the way in the back of the fuse box.
1994 E500 (MY SUNDAY DRIVER)
1993 190E SPORTLINE LE W/ M104 SWAP
2000 BMW 528I (WIFEY'S CAR)
"Excuses are crutches for the unfounded."