Displaying & Reading Trouble Codes

Diagnostic Trouble Codes (DTCs) can 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 input data list.
- Read current and history DTCs.

Clear the DTCs after a repair has been completed. Make sure the scan tool is capable of interfacing with the heater-A/C control before attempting any communications. To use the scan tool, connect the scan tool to the Data Link Connection (DLC) and turn the ignition switch to the ON position. The scan tool reads the serial data sent from the heater-A/C control terminal D12 through the splice pack SP2O5 and then to the DLC, terminal 12.