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When the EC button is lit up this indicates that the climate control head has a fault code set.This may be due to the climate control head itself at fault needing replaced or a large number or other heater or ac components like sensors and solenoids or actuators at fault needing replaced which may be disabling the climate control from operating.
What has to be done from here is to have a fully compatible scan tool plugged into your model to see what codes are set.Once this is done any codes set then need to be diagnosed to locate and repair this issue here.Once located and repaired then the codes are cleared out with the same scan tool which will then turn off the EC light and the climate control will then operate.
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