Reading Diagnostic Trouble Codes

General Troubleshooting Information

Checking for DTCs (Models without Climate Control)

The A/C control panel has a self-diagnosis function for heating, ventilation, and air conditioning system. To run the self-diagnosis function, do the following:

1. Turn the ignition switch OFF.
2. Set the fan control dial OFF, the temperature control dial on Max Cool, the mode control dial to select Vent, and the rear fan control dial OFF.
3. Turn the ignition switch ON (II).







4. Press and hold the recirculation control button. While holding the button, press the rear window defogger button five times within 10 seconds. The recirculation indicator blinks two times, then the self-diagnosis begins.

- If there is any problem in the system after self-diagnosis is finished, the recirculation indicator will blink Diagnostic Trouble Code (DTC) 1 through 15. If there are any problems in the evaporator temperature sensor circuit, the A/C indicator will blink DTC 7 or 8.
- If no DTC's are found, the indicator will not blink.

Cancelling the Self-diagnosis Function
5. Turn the ignition switch OFF to cancel the self-diagnosis function. After completing repair work, run the self-diagnosis function again to make sure that there are no other malfunctions.




Max Cool Position Function
When the mode control button is in the MAX A/C position, the A/C control panel will automatically select the recirculation mode and turn the A/C on. The recirculation switch and A/C switch are disabled and cannot be turned off in this mode. If the A/C control panel fails to function as described, replace it.

Checking for DTCs with the HDS

1. Make sure the ignition switch is OFF.




2. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
3. Turn the ignition switch ON (II).
4. Select DTCs in the body electrical/climate control mode MENU of the HDS.
5. Check for DTCs. If a DTC is indicated, go to the next step. If no DTC(s) is indicated, refer to symptom troubleshooting.
6. Turn the ignition switch OFF.
7. Disconnect the HDS from the DLC.
8. Do the troubleshooting procedure for the DTC indicated.