Procedure

1. Turn the ignition switch ON. (Engine must be running for A/C to operate.)
2. Set the interior temperature between 18 °C (65 °F) and 29 °C (85 °F).




3. Simultaneously press OFF and FOOT switches then press AUTOMATIC switch within 2 seconds.
The display screen will have a pulse tracer going around the center of the display screen, while the EATC unit checks all sensor and mode door circuits. (The system goes to OFF mode and the mode doors are recalibrated.)
If Self-diagnosis cannot be performed, go to "Trouble Diagnosis Procedure for Self-diagnosis".
4. The malfunction codes are displayed at a rate of one code per second. If no malfunction code exists, 8 8 and all symbols will be shown on the display screen. Press the DEFROST switch to exit Self-diagnosis.
5. Verify the location of the malfunction using the "Malfunction Code/Symptom Chart".




6. Press the TEMP DOWN switch to cancel Self-diagnosis without erasing malfunction codes.




7. After the malfunctions are repaired, erase the malfunction codes by pressing the DEFROST switch.
8. Perform Self-diagnosis again to verify that no malfunction codes exist.