Without Scan Tool

On-Board Diagnosis Chart - Basic Operation:

PCM CLEAR CODES
The Air Conditioning Programmer (ACP) clear codes option may be used to clear stored ACP trouble codes. When selected, the ACP Clear Codes option immediately erases all codes stored up to that point and causes the Driver Information Center (DIC) to display "ACP Codes Clear." Once a problem has been corrected, it is a good idea to clear codes so that any future service work is not needlessly confused.

To Clear Codes:

1. Enter diagnostics by pushing the "OFF" and "WARMER" buttons simultaneously.
2. Wait for "ACP?" to be displayed and then hit the "HI" button.
3. Once "DATA" is displayed push the "LO" button until "CLEAR CODES" is displayed.
4. When "CLEAR CODES" is displayed push the "HI" button and the codes will be cleared.