Without Scan Tool

How to Retrieve a DTC

The climate control unit has a self-diagnostic function. Running the Self-diagnostic Function

1. Turn the ignition switch ON (II).




2. Press the AUTO button and then the OFF button. Continue to hold both buttons down for 1 minute.




If there is any abnormality in the system, the temperature indicator will light up the segment (A through N) corresponding to the error. If no DTCs are found, go to symptom troubleshooting index. The temperature indicator will then alternate every second between displaying "88" (all segments lit) and the error code segment (A through N).

NOTE: The system will only display the DTC when the AUTO and OFF buttons are pressed. If you release the buttons, the display will go blank. To return the display, simply press the AUTO then the OFF buttons again.

To determine the meaning of the DTC, refer to the DTC troubleshooting index. If there is no abnormality, the segments will not light up.

NOTE: If there are no DTC's detected (no opens or shorts in the climate control circuits or sensors), and the system is still not operating properly, check the sensor input to the climate control unit.

Cancelling the Self-diagnostic Function

3. Turn the ignition switch OFF to cancel the self-diagnostic function. After completing repair work, run the self-diagnostic function again to make sure that there are no other malfunctions.

Rear Heater-A/C Control System

How to Retrieve a DTC

The climate control unit has a self-diagnostic function. To run the self-diagnostic function, do the following:

1. Turn the ignition switch ON (II).
2. Turn the temperature control knob to LO for about 20 seconds, then HI for about 20 seconds.
3. Press the OFF button, then press the recirculation control button to select Recirculation (recirculation indicator comes on).
4. Press and hold the recirculation control button to select Fresh (recirculation indicator goes off). Continue to hold the button. The recirculation indicator comes on for 2 seconds, and then goes off.
- If the system is OK, the recirculation indicator stays off.
- If any trouble is found, the recirculation indicator blinks the diagnostic trouble code (DTC) to indicate a faulty circuit or component.




5. After recording the DTC, release the recirculation control button.

To determine the meaning of the DTC, refer to the DTC troubleshooting index for rear heater-A/C control system.

Cancelling the Self-diagnostic Function

6. Turn the ignition switch OFF to cancel the self-diagnostic function. After completing repair work, run the self-diagnostic function again to make sure that there are no other malfunctions.