How To Troubleshoot Heating System

How to Retrieve a DTC The Audio-HVAC Module has a self-diagnostic function for heating, ventilation, and air conditioning system. To run the self-diagnostic function, do the following: Turn the ignition switch OFF. Turn the fan switch OFF. Set the temperature control dial on Max Cool, then push the mode control button to select Vent. Turn the ignition switch ON (II). Press and hold the recirculation control button. While holding the button down, press the rear window defogger button five times within 10 seconds. The recirculation indicator blinks two times, then the self-diagnostic will begin. If there is any problem in the system after self-diagnostic is finished, the recirculation indicator will blink the Diagnostic Trouble Code (DTC) 1 through 6. If there is 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. |

Example of DTC indication Pattern (DTC 3) |

Resetting the Self-diagnostic Function 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. |