Without Scan Tool

Diagnostic Trouble Codes (DTCs) may be read through the use of a scan tool. There are no provisions for flash code diagnostics. Refer to the Scan Tool Manual for specific directions or instructions.

The scan tool provides information on how to read the following information:
^ The input data list
^ Current and history DTCs

Clear the DTCs after a repair has been completed. Ensure that the scan tool is capable of interfacing with the heater-A/C control before attempting any communications. Connect the scan tool to the Data Link Connection (DLC) and turn the ignition switch to the ON position in order to use the scan tool. The scan tool reads the serial data sent from the heater-A/C control terminal D12 through the splice pack SP205 and then to the DLC, terminal 12.