Do you know what a splice in a wiring harness is ? Looking at a wiring diagram for the heater / A/C controller . I see S221 ,may have a break in the wire right there . Look here
http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model , an engine size . Under system click on HVAC , then under subsystem click on HVAC control's ,then click the search button ,then the first blue link . Scroll down to the thrid diagram. If you had factory service info. you could find the location of that splice .
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