I just checked my owners manual and there isn't anything in there about that setting (that I could find). All I can tell you is there is a diagnostic mode for the climate control unit which involves something like holding down the rest button for 10 seconds. However I don't know much more than that. Also I don't know if that would be a way to change this setting. Worst case I'm sure the dealer can switch it back.

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