Could be bad relay!!!! That would be the clicking sound you hear, the relay's! I am not sure how many there are as I do not have factory heated seats, but on another forum someone mentioned that there are 3 relays. I would check them as relays normally are not too expensive...

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....