When I turn the key to "on" or start, there is a loud irritating
beep. Thinking it was the FSS, I reset that but "beep" continues. How do I get rid of it?

AutoTrader worked for me. I'm sure someone will come along to help you my man. This forum is great for that kind of stuff.

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If you have telephone ikons on the right side of your steering wheel (not familiar with the C Class) try pressing the "hang up" ikon. This worked for me on my E Class.

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62 220sb
67 250S
72 280SE 4.5
74 280C
77 300D
82 240D
85 190E 2.3
86 300E RIP 12/28/09
85 300SD
92 300D 2.5
00 E320 Current
Over 1,000,000 miles in Benzes, Since66

....and a whole passel of BMW 2002 and Tii

The C-280 is equipped for a phone, but none installed. No switches on tyhe steering column for "hang-up" or anyplace else that I can find. I am going looking for a fusae for the phone maybe that will do it.

I know that airbomb computers going bad can beep.

Sounds like either an ABS System test or a FI System test cycle.