For 1990-2009 cars

Disconnecting the battery or the connector from the heater and A/C control will not clear a DTC. A DTC can only be cleared in one of the following two ways:

• | Using a scan tool.

• | The heater and A/C control will automatically clear a DTC if the malfunction has not occurred within 20 ignition cycles.

Most all of the information in the diagnostic tables will refer to the scan tool for diagnostic support.

Clear any history DTC after a system malfunction is corrected in order to prevent future misdiagnosis.