cold seat

Hi,new poster,I have a 99 riv that the drivers seat heater just went out on.The button lights up but all I get is a click-click noise from underneth the seat.Is there a relay that will go bad on these?Any body out there ever had this problem? any help I can get is greatly apprecated.

Well,I see this post has been up a few days and has had some looks but no response,so more info might help.The seat heater on the dirver side does not work on hi or low,the click-click noise seems to come from above the motors mounted under the seatcushion and the noise does not stop untill you turn off the seat heater or the car. The passanger seat heater is not affectied.I also found a tech.service bult.#99-08-50-021 that concerns seat heaters but all I could get was the #of the TSB not the info contained within.I hope this helps someone,maybe a buick tech out there? thanks.