I bet timmyj51 is right. I searched on "C220 defrost" and found lots of threads. They didn't seem to mention the high beams though. But it could be related. Seems a little strange though since you say the high beams do work, just not the flash position. I still go with the switch on that one.

__________________
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