You may want to double check DTC's in the Air Conditioning control unit as well. The code refers to a K2 serial interface problem. Go to N22 (A/C Pushbuttons) and on the R/H connector KEY-ON socket 10 to ground you should have >.300 V. I would imagine if the voltage is correct than N65 may not be capable of processing the info from N22, you may need to check the voltage input to N65 to be sure.