With New Generation Star Tester Scantool

Erasing Past Failure Memory
Past failures are memorized and remain in the memory even after the failed systems are corrected. The next time the system is serviced, the past failure diagnostic trouble codes will appear again on the SST (Control Unit), even though there is actually no failure. Therefore, erase past failure memory after correcting all failed systems. To erase past failure memory, press the AUTO and REC/FRESH switches on the heater control unit at the same time while in past diagnostic test mode. Past failure memory will be erased and "1" will be indicated on the SST (Control Unit).