Probably just a repair. Ask this guy on ebay:
REPAIR KIT 4 Toyota 4Runner A/C Heater Climate Control EATC Module 99 00 01 02 | eBay
Unfortunately it appears to be somewhat common on the electronic lifesupport controls. Mine, so far, has help up from day 1, hope i didn't just jynx it...
__________________
2001 Limited 4WD - 346+K - SunfireRed\Thunder Cloud; - 265/75/16 Michelin A/T2s - Fat Pat's 1.5" BL - StopTech ANGLED rotors - In series 699 trans cooler, New Yota1 transmission, All new OEM suspension front to rear.