Clearing Trouble Codes

SCAN TOOL METHOD
Select DTCs for diagnostic trouble codes. After DTCs have been viewed completely, scan tool will ask, CLEAR DTCs? Answer YES. Scan tool will then read, HISTORY DATA WILL BE LOST. CLEAR DTCs? Answer YES and DTCs will be cleared. DTCs cannot be cleared until all DTCs have been displayed.

IGNITION CYCLE DEFAULT
If no diagnostic trouble codes occur for 100 drive cycles (a drive cycle occurs when the ignition switch is turned to the RUN position, and the vehicle is driven faster than 16 km/h [10 mph]), any existing DTCs are automatically cleared from the heater-A/C control.