How To Troubleshoot the Heating and A/C Systems

How to Retrieve a DTC

The Heater Control Panel has a self-diagnosis function.

Running the Self-diagnosis Function

1.Turn the ignition switch OFF.

2.Turn the fan switch OFF, the temperature control dial on Max Cool and the mode control dial on Vent.

3.Turn the ignition switch ON (II), then press and hold the recirculation control switch. Within 10 seconds while holding the switch down, press the rear window defogger switch five times. The recirculation indicator blinks two times, then the self-diagnosis will begin. If there is any problem in the system after self-diagnosis is finished, the recirculation indicator will blink the Diagnostic Trouble Code (DTC) 7 through 13 when problems in the evaporator temperature sensor circuit are detected (codes 14 and 15), the A/C indicator will blink the DTC. If no DTC's are found, the indicator will not blink.


Example of DTC indication Pattern (DTC 3)


Resetting the Self-diagnosis Function

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.