Reading and Clearing Diagnostic Trouble Codes

NOTE: The vehicle interior and exterior temperatures should be between 10° - 32.2°C (50° - 90°F) when carrying out the self-test. If the temperature is not within the specified range, false in-vehicle temperature sensor DTCs will be displayed.

The EATC module self-test will detect concerns in the system control functions and will display hard Diagnostic Trouble Codes (DTCs) in addition to continuous diagnostic trouble codes for concerns that occur during system operation.
^ The self-test can be initiated at any time. Normal operation of the system stops when the self-test is activated.
^ To enter the self-test, press the OFF and floor position buttons simultaneously and then press the AUTOMATIC button within two seconds. The display will show a pulse tracer around the center of the display window. The test may run as long as 30 seconds. Record all DTCs displayed.

NOTE: The key must be in the RUN position to enter the self-test.

^ If any DTCs are retrieved during the self-test, proceed to Electronic Automatic Temperature Control (EATC) Module Diagnostic Trouble Code (DTC) Index. Diagnostic Trouble Code Tests and Associated Procedures
^ If a condition exists but no DTCs are retrieved during the self-test, proceed to Symptom Chart. Electronic Automatic Temperature Control Symptom Chart
^ To exit self-test and retain all continuous DTCs, push the blue (cooler) TEMP button. The module will exit self-test, retain all continuous DTCs and then turn off (display blank).
^ To exit the self-test and clear all DTCs, press the defrost button. The display will show 888 and all function symbols for one second. The module will then turn off (display blank) and all DTCs will be cleared.
^ Always exit the self-test before turning the EATC system off.
^ Continuous DTCs will be deleted after 80 ignition switch ON cycles after a continuous condition occurs.