How To Troubleshoot the Heating System (Without A/C)

How to Troubleshoot the Heating System

How to Retrieve a DTC

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

1. Set the mode control dial on the Vent position.

2. Turn the ignition switch to ON (II).

3. Within 5 seconds after turning the ignition switch on, press the recirculation control switch the required number of times depending on the recirculation indicator status:
- If the indicator is ON, press the recirculation control switch 5 times.

- If the indicator is OFF, press the recirculation control switch 6 times.

The recirculation indicator will come on for 2 seconds, then blink the Diagnostic Trouble Code (DTC) to indicate a faulty component. If no DTCs are found, the indicator will not blink after lighting for the initial 2 seconds.






Example of DTC Indication Pattern (DTC 2)





Canceling the Self-diagnosis Function

4. Turn the ignition switch to LOCK (0) 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.