Dual Electronic Automatic Temperature Control (DATC) Module Diagnostic Trouble Codes - DTCs

WARNING: This page is about a different car, the 2003 Ford Thunderbird. However, it is still accessible from the selected car via links, so may be relevant.

Using a scan tool or front panel diagnostics to check for DATC DTCs:

check continuous DTCs.
run DATC self-test. Refer to FRONT PANEL DATC SELF-TEST (ON-DEMAND DIAGNOSTIC TROUBLE CODES - DTCS) .

General information:

If the DTC is continuous only and does not appear in the self-test, this indicates an intermittent fault condition, such as a poor wiring connection or a loose terminal. If the DATC does not appear after running the self-test it may also indicate that the DTC may no longer exist.
If the DTC is continuous and appears in the self-test, this indicates a hard fault. A hard fault suggests a permanent wiring failure, disconnected connector or component failure.