Reading and Clearing Diagnostic Trouble Codes

Troubleshooting-Self-diagnosis Circuit Check:

The Automatic Climate Control System has a built-in self diagnosis feature. To run it, turn the ignition switch ON (II), then turn the fan speed dial to the AUTO position. Set the temperature control dial to 60 °F (18 °C), then gradually move the dial up the temperature range to 90 °F (32 °C). At each temperature setting, push both the AUTO and OFF buttons on the control unit at the same time. Wait for at least one minute for the system to readjust and check for problems. If any problems are found in circuits "A" through "I", the system will indicate which circuit has the problem by lighting the respective indicator light.

NOTE: The climate control unit does not memorize which self-diagnosis indicator lights come ON. If you turn the ignition switch OFF, the indicator light memory will be lost.

NOTE:
- When you turn the ignition switch OFF, the self-diagnosis function will be canceled.
- After completing repair work, run the self-diagnosis again to make sure that there are no other malfunctions.