For 1990-2009 cars only
Clearing History Codes: To prevent any future misdiagnosis, all history DTCs should be cleared after diagnosing a system problem.
Disconnecting the battery or module connectors will not clear a history DTC. A DTC can only be cleared by using one of the following methods:
| • | A scan tool. |
| • | The On-Board Service Diagnostic (OBSD). |
| • | A module may clear a history DTC after 50 ignition cycles. |
Most of the diagnostic tables refer to the scan tool for diagnostic support. For details on using the OBSD to clear DTCs refer to Diagnostic Trouble Code (DTC) Clearing in HVAC Systems with A/C Automatic.
