The heated seat button works in an unusual way on my 02 W210. When I push the top 1/2 of the button nothing happens, no lights or heat. If I push the bottom 1/2 the seat turns on as expected in High, push the bottom again and it goes to the low setting, push it a third time and it goes off. The top 1/2 of the switch doesn't seem to do anything. Would this problem be related to the switch itself or a relay? Or something entirely different?

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1986 190E 186K (For Sale)
(Maroon, Tan leather)
1996 C280 Sport 208K
(Brilliant Silver, Black Leather)
2002 CLK430 Sport 45K
(Brilliant Silver, Gray Leather , Birdseye Maple)