Welcome to the forum. You will find the search feature is a powerful tool on this site. I searched on "C280 seats" and found this thread which likely contains the information you are looking for.

'98 C280 Power seat problems

I am fairly certain of this since I had the same problem and many others have as you will see when you read the thread!

Good luck!

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra